PRELIMINARY ASSESSMENT LAS CRUCES PCE DONA ANA COUNTY, NEW MEXICO CERCLIS IDENTIFICATION NUMBER: not assigned

3 November 1997

NEW MEXICO ENVIRONMENT DEPARTMENT GROUND WATER QUALITY BUREAU SUPERFUND OVERSIGHT SECTION

Prepared By r\ /] -JlmJSp*- ^r\Jo^\s~+-^*> christopher holmes

000962 PRELIMINARY ASSESSMENT LAS CRUCES PCE Table of Contents

1. INTRODUCTION...... 1 2. SITE DESCRIPTION, LOCATION, AND WASTE CHARACTERISTICS ...... 1 2.1 Site Description and Location ...... 1 2.2 Waste Characteristics...... 2 3. GROUND WATER PATHWAY ...... 3 3.1 Hydrogeologic Setting ...... 3 3.2 Ground Water Targets ...... 4 3.2 Ground Water Conclusions...... 4 4. SURFACE WATER PATHWAY...... 5 5. SOIL EXPOSURE AND AIR PATHWAYS...... 5 6. SUMMARY AND CONCLUSIONS ...... 5 REFERENCES ...... 6 List of Tables Table 1 .Tetrachloroethylene concentrations (^g/1) in samples from Las Cruces municipal wells. 2 Table 2. Population served by municipal wells within 4 miles of Las Cruces PCE site...... 4 List of Figures Figure 1. Location of Las Cruces PCE Site...... 8 Figure 2. Mesilla Ground-Water Basin...... 9 Figure 3. Generalized geohydrologic section of the northern Mesilla Basin...... 10

000963 Preliminary Assessment Las Graces PCE 3 November 1997 Page 1 1. INTRODUCTION Under the authority of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA), the New Mexico Environment Department, Superfund Oversight Section, conducted a Preliminary Assessment (PA) at the Las Cruces PCE site in Dona Ana County, New Mexico. The purpose of this investigation was to collect information concerning conditions at the Las Cruces PCE site sufficient to assess the threat posed to human health and the environment and determine the need for additional investigation under CERCLA/SARA. The scope of the investigation included a review of existing analytical data and available file information and on-site reconnaissance (19-20 May 1997). A CERCLIS identification number has not been assigned to this site. 2. SITE DESCRIPTION, LOCATION, AND WASTE CHARACTERISTICS 2.1 Site Description and Location The Las Cruces PCE site consists solely of a contaminated ground water plume with no identified source. Tetrachloroethylene also referred to as perchloroethylene (PCE) has been measured hi water samples from four City of Las Cruces municipal wells (Figure 1) (Table 1) (Reference 1). The effected municipal wells are 18, 19, 21, and 27. All four effected wells are located in Las Cruces, in an area approximately 2,500 feet by 4,000 feet (Reference 2). Well 18 is located at 153 North Cottonwood Street (Reference 3). Well 19 is located at 101 South Triviz Drive (Reference 3). Well 21 is located at 671 North Triviz Drive (Reference 3). Well 27 is located at 2025 East Griggs Avenue (Reference 3). The effected wells range from 576 to 730 feet deep (Reference 4). The depth to water in the effected wells ranges from 208 to 250 feet (Reference 4). Tetrachloroethylene has not been detected in water samples from surrounding wells, 10, 20, 26, 28, 54, and 57 (Reference 1). The center of the site was taken to be the latitude, halfway between the north and south most wells and longitude halfway between the east and west most wells. The coordinates of the site are 32° 19' 08" latitude and 106° 45' 16" longitude (Reference 5). The contaminated municipal wells are located Township 23 S, Range 2 E, sections 8 and 9 (Reference 4). The climate of Dona Ana County is arid (Reference 6, page 4). In the basin area along the Rio Grande, temperatures reach 90° F or greater an average of 101 days a year (Reference 6, page 5). Winters are mild. The average daily minimum hi January, the coolest month, is 25°F. The average daily maximum is 57°F (Reference 6, page 5). Potential evaporation and transpiration greatly exceeds rainfall (Reference 6, page 5).

000964 Preliminary Assessment Las Cruces PCE 3 November 1997 Page 2 2.2 Waste Characteristics The Las Cruces PCE site consists solely of a contaminated ground water plume with no identified source. Tetrachloroethylene has consistently been detected in samples from municipal wells 18,21, and 27 (Reference 1). Two water samples from well 18 have contained greater than the federal drinking water standard of 5 /^g/1 for PCE. Existing analytical data is summarized in Table 1. Table 1. Tetrachloroethylene concentrations Qg/1) in samples from Las Cruces municipal wells. Date Well 18 Date Well 19 Date Well 21 Date Well 27 3/13/94 0.0 3/13/94 0.3 8/9/93 0.9 8/9/93 1.4 1/10/95 32.0 5/16/94 0.3 2/17/94 0.8 5/16/94 0.7 2/22/95 1.5 10/3/94 0.0 6/21/94 1.0 10/3/94 0.6 2/27/95 *1. 1/1.2 1/9/95 0.0 10/10/94 1.0 5/9/95 0.8 4/12/95 0.5 4/5/95 0.0 1/10/95 0.7 8/18/95 0.0 8/18/95 0.6 8/18/95 0.0 4/5/95 1.3 10/4/95 0.8 10/4/95 0.0 10/4/95 0.0 8/18/95 1.2 2/23/96 mmma^^m1.0 1/9/96 6.4 1/9/96 0.6 10/4/95 1.2 1 7/23/96 0.0 1/9/96 1.1 1 2/21/96 0.8 4/3/96 0.8 5/2/96 1.0 * duplicate samples Tetrachloroethylene is a CERCLA hazardous substance (Reference 7, pages A-722 and A-722). It is a solvent for fats, greases, waxes, rubber, gums, and caffeine (Reference 8, pages 580-581). Uses of PCE include dry cleaning; metal degreasing; removing soot from industrial boilers; heat transfer; and manufacturing fluorocarbons, paint removers, printing inks, trichloroacetic acid and vermifuge (Reference 8, pages 580-581). Under ambient environmental conditions, PCE is a dense npnaqueous phase liquid (DNAPL) chemical (Reference 9, page 3-1). Immiscible fluids, such as PCE, do not completely dissolve in

000965 Preliminary Assessment Las Graces PCE 3 November 1997 Page 3 water but exist as separate liquid and aqueous phases (Reference 9, pages C-2 and C-3). Denser than water NAPLs sink through the saturated zone. The subsurface movement of DNAPL is controlled substantially by the nature of the release; DNAPL density, interfacial tension, and viscosity; capillary forces; and to a lesser extent hydraulic forces (Reference 9, page 2-1). Because of their high density and low viscosity chlorinated solvents such as PCE are highly mobile as a separate phase (Reference 9, page 3-9). 3. GROUND WATER PATHWAY 3.1 Hydrogeologic Setting Las Cruces is located within the Mesilla Ground-Water Basin (Figure 2) (Reference 10, page 3). The Santa Fe Group and flood plain alluvium of the Rio Grande constitute the major aquifer of the Mesilla Ground-Water Basin (Reference 11, page 1). The aquifer is bound by less permeable bedrock (Figure 3) (Reference 11, page 1). The flood plain alluvium is about 4 miles wide along the Rio Grande and 80 feet thick. It generally has a thick basal channel unit consisting of sand and gravel overlain by finer grained flood-plain deposits (Referenc2 e 12, page 28). Horizonta1 l hydraulic conductivities for the river alluvium range from 3.53 x 10" cm/s to 1.23 x 10' cm/s (Reference 11, page 15). The Santa Fe Group is a rock-stratographic unit, classified on the basis of lithology and depositional environment. It consists of unconsolidated to moderately consolidated sedimentary deposits, minor ash-fall volcaniclastics, and other volcanic rocks (Reference 12 page 23). It is approximately 2,500 feet thick (Reference page 12). Dividing the Santa Fe Group into three hydrostratigraphic units facilitates assigning hydraulic properties it (Reference 11, page 13). For the uppe4 r unit of the Santa8 Fe Group, estimates of horizontal hydraulic conductivity range from 7.06 x 10" cm/s to 2.40 x 10~ cm/s (Reference 11, pag4 e 13). Estimates of 2 horizontal hydraulic conductivity for the middle unit range from 3.53 x 10" cm/s to 3.53 x 10~ cm/s (Reference 11, page 13). For the 2 lower unit, estimates of horizontal hydraulic conductivity range from 3.53 x 10"* cm/s to 1.20 x 10' cm/s. From which unit(s) the Las Cruces municipal wells are pumping is currently unknown. The Rio Grande is the primary source of recharge to the aquifer system of the Mesilla basin (Reference 10, page 65). Water moves from the shallow flood plain alluvium to the upper Santa Fe Group through a series of interbedded gravel, sand, and clay lenses (Reference 10, page 65). Thin interbedded clay lenses in the lower part of the flood plain alluvium and upper Santa Fe Group restrict vertical flow. Horizontal permeability usually exceeds vertical permeability by several orders of magnitude because of vertical heterogeneity (Reference 10, page 65).

000966 Preliminary Assessment Las Cruces PCE 3 November 1997 Page 4 3.2 Ground Water Targets Las Cruces is served by two municipal water systems, Las Cruces Municipal Water and Las Cruces East Mesa Water System (Reference). Both water systems are operated by the City of Las Cruces and rely completely on ground water as their source of water. The Las Cruces Municipal Water System is a blended system supplying water from twenty-eight wells to 67,900 people (2,425 people per well) (Reference 13). No single well contributes more than 40% of the total water (Reference 14). The four municipal wells from which samples containing PCE have been collected are operated by the Las Cruces Municipal Water System. The Las Cruces East Mesa Water System supplies water from two wells to 130 people (Reference 13). Twenty-three wells including the wells contaminated PCE, are located with in four miles of the Las Cruces PCE site (Reference 15). Well 18 was taken off-line because of PCE contamination (Reference 3). Table 2. Population served by municipal wells within 4 miles of Las Cruces PCE site. Distance, miles Well numbers Population off-line due to PCE 18 2,425 on site 19,21,27 7,275 0.5 to 1.0 26,20 4,850 1.0 to 2.0 10, 24, 25 ,28, 38, 54, 57 16,975 2.0 to 3.0 22, 23,29, 34 35, 39, 44, 45 17,150 3.0 to 4.0 29,33 4,850 Total 55,775 3.2 Ground Water Conclusions For a period of over 2 years, PCE has consistently been detected in samples from Wells 18,21, and 27. Two samples from Well 18 have contained greater than the federal drinking water standard of 5 fj.g/1 of PCE. Well 18 was taken off-line because of PCE contamination. The remaining three effected wells supply water to 7,275 people. Twenty-three wells supplying 55,775 people are located within 4 miles of this site. Therefore, the threat to human health through the ground water pathway is likely significant.

000967 Preliminary Assessment Las Cruces PCE 3 November 1997 PageS

4. SURFACE WATER PATHWAY As the source of ground water contamination has not been identified , the overland/flood migration component for the surface water pathway for this site cannot be characterized at this time. Studies by the US Geological Survey have demonstrated that the Rio Grande is a losing stream in the Las Cruces section (Reference 10, page 65). The ground water to surface water migration component of the surface water pathway is not a likely route of exposure. 5. SOIL EXPOSURE AND AIR PATHWAYS As the source of ground water contamination has not been identified, the soil and air pathways for this site cannot be characterized at this time. 6. SUMMARY AND CONCLUSIONS For a period of over 2 years, PCE has consistently been detected in samples from Las Cruces municipal wells 18,21, and 27. Two samples from Well 18 have contained greater than the federal drinking water standard of 5 //g/1 for PCE. Well 18 has been taken off-line because of PCE contamination. Twenty-three wells supplying 55,775 people are located within 4 miles of this site. The aquifer system of the Mesilla ground-water basin is the only source of water for the City of Las Cruces. Therefore, the threat to human health through the ground water pathway is likely significant. The Las Cruces PCE site consists solely of a contaminated ground water plume with no identified source. Because the source of ground water contamination has not been identified, the surface water, soil, and air pathways for this site cannot be characterized at this time.

000968 Preliminary Assessment Las Cruces PCE 3 November 1997 Page 6 REFERENCES 1. New Mexico Environment Department, Drinking Water Bureau, New Mexico Public Water System Chemical Results During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97, Las Cruces Municipal Water System. 2. City of Las Cruces Tech Support / Drafting Staff, 1996 Water Well Map. 3. New Mexico Environment Department, Ground Water Quality Bureau, Superfund Oversight Section, Record of Conversation Between Christopher holmes and Bobby Soto, Las Cruces Water Superintendent, 29 October 1997. 4. New Mexico Environment Department, Drinking Water Bureau, Water System Sample Points, Las Cruces Municipal Water System, 12 March 1996. 5. New Mexico Environment Department, Ground Water Quality Bureau, Superfund Oversight Section, Latitude and Longitude worksheet, 29 October 1997. 6. King, W.E., et al, "Geology and Ground-Water Resources of Central and Western Dona County, New Mexico," New Mexico State Bureau of Mines and Mineral Resources, 1971, pages 4-5,. 7. U.S. EPA, "Revised Superfund Chemical Data Matrix," pages A-721 to A-722, June 1996. 8. Verschueren, Karel, "Handbook of Environmental Data on Organic Chemicals," Second Edition; Van Nostrand Reinhold Company, 1983, pages 580-583. 9. Cohen, Robert M. and James W. Mercer, "DNAPL Site Evaluation," C.K. Smoley, 1993, pages 2-1, 3-1 to 3-9, c-2, and c-3. 10. U.S. Geological Survey, "Geohydrology of the Mesilla Basin, Dofia County, New Mexico, and El Paso County, Texas, Water -Resources Investigations Report 92-4156,1993, pages 1-3, 8-9, and 65. 11. U.S. Geological Survey, "Simulation of Ground-Water Flow in the Mesilla Basin, Dona County, New Mexico, and El Paso County, Texas," Water -Resources Investigations Report 91-4155, 1992, pages 1,12-15. 12. U.S. Geological Survey, "Geohydrology and Simulation of Ground-Water Flow in the Mesilla Basin, Dofia County, New Mexico, and El Paso County, Texas," Open-File Report 88-305.

000969 Preliminary Assessment Las Cruces PCE 3 November 1997 Page? 13. New Mexico Environment Department, Drinking Water Bureau, Water System Inventory 29 July 1997. 14. City of Las Cruces, Total Monthly Water Report, Well Operation and Water production, January 1994 to December 1994. 15. New Mexico Environment Department, Ground Water Quality Bureau, Superfund Oversight Section, Las Cruces PCE , Four-Mile Radius Map, November 1994.

000970 C/T -C) WEST SEAST f\ ; ___ .__Mcsillj Has in ,is dofincil ___„._ __ Jornada del Muerto __ 1 z? f k' for this si udy Basin 1 gg r- 0 C 6 , 000 ' - / - 6.000' X / MA HI PART I ' / 5,000' - R"IE°° , 1 CKUCll - S , OOO ' FAUtT ———— HISIHA VAlllY ——— 1 >•"«<• I » 1 ^-^1 1 LAND SURFACE j0Nl 'win W ^~* ^ "^ 1 — f itto -— - "^* -^ 1 Bedrock ^ tfl w 3 , 000 ' - nl ^1 -3,000' Bedrock El 1 SjiHci Fe fironp .\^Y 1 i3 k ^ C 1 n •iH 1 . ^ Bed roc- \ F 1 S Y 3 1l J1 f it j ~ >V» 2 . 000 ' - 1 « ' " -* V^ 1 ill - 2 , 000 • 1 = mir,....»'» J(f ^ l ! " 1 1 1 . 000 ' — - 1 . 000 ' x 1 1 'r^'T7itiin.^ (""l/TiT V^ 1 1 «~l~ ft 1 FVE L 1 1 ""n/riim.m — t i » 1 1 c c* n i «r */ tr i 1 0 1 2 3 4 5MIUES Modified from Haw ley (I98 !, pi. 5) 1,1111 1 1 1 1 1 1 01234 S KILOMETERS VERTICAL EXAGGERATION Y. 10 EXPLANAT 1 ON FAULT--Dashed where inferred. Arrows indicate direction of relative vertical movement mil11 1 APPROXIMATE CONTACT BETWEEN SAHIA FE GROUP AND IIMDfRIYING BEDROCK * POSSIBLE PATH OF UNDERFLOW INTO THE BASIN--X indic,jles flow in the Santa Fe Group; Y indicates flow partly through bedrock; 7 indicates very deep flow jf POSSIBLE PATH OF FLOW FROM FIOOD-PLAIM ALLUVIUM Figure 3. Generalized geuhydrologic section of the northern Mesilla Basin.

000971 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 07-JUN-95 RJAC OR952796 R ISOPROPYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 1 WELL #10 U 0.0000 0.5000 UG/L THANE) -Q R N-BUTYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L L/vJ R N-PROPYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L t r*, R NAPHTHALENE 1 WELL #10 U 0.0000 0.5000 UG/L _ Q R 0-CHLOROTOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L ._O R 0-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R STYRENE 1 WELL #10 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 1 WELL #10 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 1 WELL #10 U 0.0000 5.0000 UG/L R TOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 1 WELL #10 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 1 WELL #10 U 0.0000 1.0000 UG/L 28-MAY-96 RJAC OR9601889 R 1,1,1,2-TETRACHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L

000972 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 1 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME no——t———$${ O—F DAT—--E STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS •10 %0%00005000 UG R 1,2,3-TRICHLOROBENZENE •NE 1 WELL #10 U 0.0000 0.500 R 1,2,3-TRICHLOROPROPANE 1 WELL flO U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 1 WELL 110 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 1 1 WELL #10 U 0.0000 5.0000 UG/L E) R BENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R BROMOBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R BROMOFORM 1 WELL #10 U 0.0000 0.5000 UG/L R BROMOMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 1 WELL #10 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 1 WELL #10 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 1 WELL #10 U 0.0000 2.5000 UG/L R CHLOROFORM 1 WELL #10 U 0.0000 0.5000 UG/L R CHLOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R CIS-1,2-DICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R CIS-1,3-DICHLOROPROPENE 1 WELL #10 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R ETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 1 WELL #10 U 0.0000 0.5000 UG/L

000973 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 28-MAY-96 RJAC OR9601889 R 1,3-DICHLOROPROPANE 1 WELL 110 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 1 WELL #10 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 1 WELL 110 U 0.0000 5.0000 UG/L E) R BENZENE 1 WELL 110 U 0.0000 0.5000 UG/L R BROMOBENZENE 1 WELL 110 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R BROMOOICHLOROMETHANE 1 WELL tlQ U 0.0000 0.5000 UG/L R BROMOFORM 1 WELL # 10 2.7000 0.5000 UG/L R BROMOMETHANE 1 WELL #10 U o.oooo • 0.5000 UG/L R CARBON TETRACHLORIDE 1 WELL 110 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 1 WELL 110 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R CHLOROFORM 1 WELL 110 U 0.0000 0.5000 UG/L R CHLOROMETHANE 1 WELL 110 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 1 WELL #10 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 1 WELL flO 1.7000 0.5000 UG/L R DIBROMOMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R ETHYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 1 WELL #10 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 1 WELL #10 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R NAPHTHALENE 1 WELL #10 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 1 WELL #10 . U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 1 WELL #10 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 1 WELL #10 U 0.0000 0.5000 UG/L

000974 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 28-MAY-96 RJAC OR9601889 R STYRENE 1 WELL 110 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 1 WELL #10 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 1 WELL flO U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 1 WELL 110 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 1 WELL #10 U 0.0000 5.0000 UG/L R TOLUENE 1 WELL flO U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRANS-1, 3-DICHLOROPROPENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 1 WELL #10 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 1 WELL #10 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 1 WELL #10 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 1 WELL #10 U 0.0000 0.5000 UG/L 117 rows selected.

000975 September 26, 1997 New Mexico Public Water Supply Systen Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-MAR-94 RJAC OR941142 R 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L R BENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R BROHOBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 N 0.0000 0.5000 UG/L R BROMOMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R CHLOROFORM 2 WELL #18 N 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 2 WELL #18 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 N 0.0000 0.5000 UG/L THANE) R 0-CHLOROTOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 N 0.0000 5.0000 UG/L

000976 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDf COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 13-MAR-94 RJAC OR941142 R TETRACHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L R TOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 2 WELL #18 N 0.0000 0.5000 UG/L 10-JAN-95 RJAC OR950308 I 1,1,1, 2-TETRACHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,1,1-TRICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,1 .2. 2-TETRACHLOROETHAN2E WELL #18 N 0.0000 0.5000 UG/L I 1,1,2-TRICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,1-DICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,1-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,1-DICHLOROPROPENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2,3-TRICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2,3-TRICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2,4-TRICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2,4-TRIMETHYLBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2-DICHLOROETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,2-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,3,5-TRIMETHYLBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I 1,3-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L I 2,2-DICHLOROPROPANE 2 WELL #18 N 0.0000 0.5000 UG/L I 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 N 0.0000 5.0000 UG/L E) I BENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I BROMOBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I BROMOCHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I BROMOOICHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I BROMOFORM 2 WELL #18 N 0.0000 0.5000 UG/L I BROMOMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I CARBON TETRACHLORIDE 2 WELL #18 N 0.0000 0.5000 UG/L I CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 N 0.0000 0.5000 UG/L NE) I CHLOROETHANE 2 WELL #18 N 0.0000 2.5000 UG/L I CHLOROFORM 2 WELL #18 N 0.0000 0.5000 UG/L I CHLOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L I CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L

000977 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 10-JAN-95 RJAC OR950308 I CIS-1, 3-DICHLOROPROPENE 2 WELL # 18 N 0.0000 0.5000 UG/L I DIBROMOCHLOROMETHANE 2 WELL f 18 N 0.0000 0.5000 UG/L DIBROMOMETHANE 2 WELL f 18 N 0.0000 0.5000 UG/L DICHLORODIFLUOROMETHANE 2 WELL 118 N 0.0000 0.5000 UG/L ETHYLBENZENE 2 WELL 118 N 0.0000 0.5000 UG/L HEXACHLOROBUTAD I ENE 2 WELL 118 N 0.0000 0.5000 UG/L ISOPROPYLBENZENE 2 WELL f 18 N 0.0000 0.5000 UG/L M-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 N 0.0000 0.5000 UG/L THANE) N-BUTYLBENZENE 2 WELL f 18 N 0.0000 0.5000 UG/L NAPHTHALENE 2 WELL #18 N 0.0000 0.5000 UG/L 0-CHLOROTOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L 0-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L P-CHLOROTOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L P-DICHLOROBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L I P-ISOPROPYLTOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L I SEC-BUTYLBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L STYRENE 2 WELL #18 N 0.0000 0.5000 UG/L TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 N 0.0000 5.0000 UG/L TERT-BUTYLBENZENE 2 WELL #18 N 0.0000 0.5000 UG/L TETmCHUMOrrHVUNC 2 HELL #18 32.0000 0.5000 UG/L TETRAHYDROFURAN (THF) 2 WELL #18 N 0.0000 5.0000 UG/L TOLUENE 2 WELL #18 N 0.0000 0.5000 UG/L TRANS-1,2-DICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L TRICHLOROETHYLENE 2 WELL #18 N 0.0000 0.5000 UG/L TRICHLOROFLUOROMETHANE 2 WELL #18 N 0.0000 0.5000 UG/L VINYL CHLORIDE 2 WELL #18 N 0.0000 2.0000 UG/L XYLENES, TOTAL 2 WELL #18 N 0.0000 1.0000 UG/L 22-FEB-95 RJAC OR950967 C 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 2 WELL #18 U . 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L

000978 September 26, (1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 22-FEB-95 RJAC OR950967 C 1.2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3-OICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) C BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOFORN 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) C CHLOROETHANE 2 WELL #18 U 0.0000 2.5000 UG/L C CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1. 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C D I BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C D I BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C HEXACHLOROBUTAD I ENE 2 WELL #18 U 0.0000 0.5000 UG/L C ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) C N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L

000979 September 26 New Mexico Public Water Supply System Chemical Results Page: 5 X During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 22-FEB-95 RJAC OR950967 C P-CHLOROTOLUENE 2 WELL 118 U 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-ISOPROPYLTOLUENE 2 WELL 118 U 0.0000 0.5000 UG/L C SEC-BUTYLBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L C STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L C TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C TETRACHLOROETHYLENE 2 HELL #18 1.5000 0.5000 UG/L C TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L C TOLUENE 2 WELL 118 U 0.0000 0.5000 UG/L C TRANS-1.2-DICHLOROETHYLENE 2 WELL 118 U 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 2 WELL 118 U 0.0000 0.5000 UG/L C TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L C XYLENES, TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L 27-FEB-95 RJAC OR951035 C 1.1,1, 2-TETRACHLOROETHANE2 WELL #18 U 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1, 2, 2-TETRACHLOROETHAN2E WELL #18 U 0.0000 0.5000 UG/L C 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) C BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L

000980 September 26, lay? New Mexico Public Water Supply Systeo Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 27-FEB-9S RJAC OR951035 C BROMOMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) C CHLOROETHANE 2 WELL #18 U 0.0000 2.5000 UG/L C CHLOROFORM 2 WELL 118 U 0.0000 0.5000 UG/L C CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1. 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1 , 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C DIBROMOCHLORONETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C D I BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C DICHLOROOIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L C ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) C N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L C TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C TETRACHLOROETHYLENE 2 WELL #18 1.1000 0.5000 UG/L C TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L C TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRANS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 1 0.5000 UG/L C VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L C XYLENES, TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L

000981 September 26, 1997 New Mexico Public Water Supply Systen Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 27-FEB-95 RJAC OR951036 C 1,1,1.2-TETRACHLOROETHANE 2 WELL 118 U 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 2 WELL 118 U 0.0000 0.5000 UG/L C 1,1,2,2-TETRACHLOROETHANE 2 WELL 118 U 0.0000 0.5000 UG/L C 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1.2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) C BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOBENZEtiE 2 WELL #18 U 0.0000 0,5000 UG/L C BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROHOFORM 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) C CHLOROETHANE 2 WELL #18 U 0.0000 2.5000 UG/L C CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C DIBROMOMETHANE 2 WELL #18 . U 0.0000 0.5000 UG/L C DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L

000982 September 26, 1997 New Mexico Public Water Supply System CheatcaI Results Page: 8 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID! COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 27-FEB-95 RJAC OR951036 C ISOPROPYLBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 2 WELL * 18 U 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 2 WELL 118 U 0.0000 0.5000 UG/L THANE) C N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C NAPHTHALENE 2 WELL 1*18 U 0.0000 0.5000 UG/L C 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 2 WELL f 18 U 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L C TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C TETRACHLOROETHYLENE 2 WELL #18 1.2000 0.5000 UG/L C TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L C TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRANS-1.2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRI CHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L C XYLENES. TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L 12-APR-95 RJAC OR951871 R 1,1, 1, 2-TETRACHLOROETHAN2E WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN2E WELL #18 U 0.0000 0.5000 UG/L R 1 , 1 , 2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 . U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L

000983 September 26. 1997 New Mexico Public Water Supply System Chemical Results Page: 9 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT +/- MOL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 12-APR-95 RJAC OR951871 R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL 118 U 0.0000 5.0000 UG/L E) R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMONETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 U 0.0000 2.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R OIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTAOIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-OICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L

000984 September 26. 1997 New Mexico Public Water Supply System Chemical Results Page: 10 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 12-AW-95 RJAC OR951871 R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 0.5000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1,2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L 18-AUG-95 RJAC OR953817 R 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2.4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROHODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE WELL #18 0.0000 2.5000 UG/L

000985 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 11 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 18-AUG-95 RJAC OR953817 R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL f 18 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 0.6000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS- 1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L 04-OCT-95 RJAC OR9504376 R 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE . 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L

000986 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 12 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504376 R 1,1-DICHLOROETHYLENE 2 WELL * 18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL 418 U 0.0000 0.5000 UG/L R 1,2.3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 U 0.0000 2.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1. 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE)

000987 September 26. 1997 New Mexico Public Water Supply System Chemical Results Page: 13 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504376 R N-BUTYLBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L R N-PROPYLBEN2ENE 2 WELL 118 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL 118 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL 118 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRI CHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 1.0000 UG/L 09- JAN-96 RJAC OR9600156 R 1,1.1, 2-TETRACHLOROETHAN2 E WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN2E WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.2.3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-OICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 . U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E)

000988 September 26, r1997 New Mexico Public Water Supply Systen Chenlcal Results Page: 14 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600156 R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL f 18 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROHOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIOE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1. 3-OICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-OICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-OICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 .U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLBK 2 WELL #18 6.4000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L

000989 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 15 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600156 R TOLUENE 2 WELL 118 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 0.5000 UG/L 21-FEB-96 RJAC OR9600791 C 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1.1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1.2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1.1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1.2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L C 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) C BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L C BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) C CHLOROETHANE 2 WELL #18 U .0.0000 0.5000 UG/L C CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L C CHLOROHETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C CIS-1 ,2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L

000990 September 26, r1997 New Mexico Public Water Supply System Chemical Results Page: 21 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDf COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 23-JUL-96 RJAC OR9602527 R CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLORODI FLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL f 18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZEHE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 0.5000 UG/L 736 rows selected.

000991 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 16 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600791 C CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C OIBROMOMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L C DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L C ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) C N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L C TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L C TETRACHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TETRAHYDROFURAN (THF) 2 WELL 118 0.8000 5.0000 UG/L C TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRANS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRANS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L C TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L C VINYL CHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L C XYLENES, TOTAL 2 WELL #18 U 0.0000 0.5000 UG/L 03-APR-96 RJAC OR9601347 R 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L

000992 September 26, 1997 New Mexico Public Water Supply System Cheaical Results Page: 17 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDi COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 03-APR-96 RJAC OR9601347 R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2.3-TRICHLOROPROPANE 2 WELL 118 U 0.0000 0.5000 UG/L R 1.2,4-TRICHLOROBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1. 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L

000993 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 18 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT lOt COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 03-APR-96 RJAC OR9601347 R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL f 18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL f 18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 0.8000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRANS-1, 3-D ICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 0.5000 UG/L 02-MAY-96 RJAC OR9601597 R 1,1,1, 2-TETRACHLOROETHANE2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN2E WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) R BENZENE WELL #18 0.0000 0.5000 UG/L

000994 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 19 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDi COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 02-MAY-96 RJAC OR9601597 R BROMOBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOD ICHLOROMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOHETHANE 2 WELL 118 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL 118 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL f 18 U 0.0000 0.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL §18 U 0.0000 0.5000 UG/L R CIS-1,2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 2 WELL 118 U 0.0000 0.5000 UG/L R D I BROMOCHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 2 WELL tl8 U 0.0000 0.5000 UG/L R ETHYLBENZENE 2 WELL 118 U 0.0000 0.5000 UG/L R HEXACHLOROBUTAD I ENE 2 WELL #18 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 2 WELL #18 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R NAPHTHALENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R STYRENE 2 WELL #18 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 2 WELL #18 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 2 WELL #18 . U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 2 WELL #18 1.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 2 WELL #18 U 0.0000 5.0000 UG/L R TOLUENE 2 WELL #18 U 0.0000 0.5000 UG/L

000995 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 20 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDi COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 02-MAY-96 RJAC OR9601597 R TRANS-1,2-DICHLOROETHYLENE 2 WELL 118 U 0.0000 0.5000 UG/L R TRANS-1.3-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 2 WELL 118 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 2 WELL 118 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 2 WELL #18 U 0.0000 0.5000 UG/L 23-JUL-96 RJAC OR9602527 R 1,1,1,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.1,1-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 2 WELL f 18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2.4-TRICHLOROBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 1.3,5-TRIMETHYLBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 2 WELL #18 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 2 WELL #18 U 0.0000 5.0000 UG/L E) R BENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOBENZENE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOCHLOROHETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOFORM 2 WELL #18 U 0.0000 0.5000 UG/L R BROMOMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 2 WELL #18 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROFORM 2 WELL #18 U 0.0000 0.5000 UG/L R CHLOROMETHANE 2 WELL #18 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 2 WELL #18 U 0.0000 0.5000 UG/L

000996 September 26, \ New Mexico Public Water sYs, , ^^ii y System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT +/" MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-MAR-94 RJAC OR941143 R 1 , 1 , 1 , 2-TETRACHLOROETHAN3 WELEL #19 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHAN3 E WELL #19 N 0. 0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1 , 2 , 3-TRICHLOROPROPAN3 WELE L #19 N 0. 0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 N 0. 0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 N 0. 0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 N 0. 0000 0.5000 UG/L R BENZENE 3 WELL #19 N 0. 0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R BROMOD ICHLOROMETHANE 3 WELL #19 N 0. 0000 0. 5000 UG/L R BROMOFORM 3 WELL #19 N 0. 0000 0. 5000 UG/L R BROMOMETHANE 3 WELL #19 N 0. 0000 0. 5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 N 0. 0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 N 0. 0000 0. 5000 UG/L NE) R CHLOROETHANE 3 WELL #19 N 0. 0000 0. 5000 UG/L R CHLOROFORM 3 WELL #19 N 0.0000 0. 5000 UG/L R CHLOROMETHANE 3 WELL #19 N 0. 0000 0. 5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R D I BROMOCHLOROMETHANE 3 WELL #19 N 0. 0000 0. 5000 UG/L R ETHYLBENZENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 N 0. 0000 0. 5000 UG/L THANE) R 0-CHLOROTOLUENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 N 0. 0000 . 0.5000 UG/L R P-D I CHLOROBENZENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R STYRENE 3 WELL #19 N 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 N 0. 0000 5. 0000 UG/L

000997 September 26 New Mexico Public Water Supply System Chemical Results Page: ,L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-MAR-94 RJAC OR941143 R TETRACHLOROETHYLENE 3 WELL f 19 T 0.3000 0.5000 UG/L R TOLUENE 3 WELL f!9 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 3 WELL #19 N 0.0000 0.5000 UG/L 16-MAY-94 RJAC OR941557 C 1,1,1, 2-TETRACHLOROETHANE 3 WELL f 19 N 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 3 WELL 119 N 0.0000 0.5000 UG/L C 1,1, 2, 2-TETRACHLOROETHAN3E WELL #19 N 0.0000 0.5000 UG/L C 1,1.2-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 3 WELL 119 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L C BENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C BRONOBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C BROMOFORM 3 WELL #19 N 0.0000 0.5000 UG/L C BROMOMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 3 WELL #19 N 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 N 0.0000 0.5000 UG/L NE) C CHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C CM.MQHMM 3 WELL #19 T 0.1000 0.5000 UG/L C CHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L C CIS-1.3-DICHLOROPROPENE 3 WELL #19 N 0.0000 0.5000 UG/L C DIBROMOCHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L C ETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 N 0.0000 0.5000 UG/L THANE)

000998 September 26, 19a7 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 16-MAY-94 RJAC OR941557 C 0-CHLOROTOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L C STYRENE 3 WELL #19 N 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 N 0.0000 5.0000 UG/L C TETRACHLOROETHYLENE 3 WELL #19 T 0.3000 0.5000 UG/L C TOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L C TRANS-1.2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L C VINYL CHLORIDE 3 WELL #19 N 0.0000 0.5000 UG/L C XYLENES, TOTAL 3 WELL #19 N 0.0000 0.5000 UG/L 03-OCT-94 RJAC OR943167 R 1,1,1, 2-TETRACHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1,2. 2-TETRACHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1.1,2-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL #19 N 0.0000 5.0000 UG/L E) R BENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 N 0.0000 0.5000 UG/L

000999 September 26, New Mexico Public Water sVSu .yy System Chemical Results Page: 4 During the Period Beginning Ol-JUL-9rhrl 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/- MDL UNITS NE) 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 03-OCT-94 RJAC OR943167 R CHLOROETHANE 3 WELL #19 N 0.0000 2.5000 UG/L R CHLOROFORM 3 WELL #19 N 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL 119 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL 119 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R DIBROMOMETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 3 WELL 119 N 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 N 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL #19 N 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 3 WELL 119 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 N 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 N 0.0000 5.0000 UG/L R TOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 N 0.0000 2.0000 UG/L R XYLENES, TOTAL 3 WELL #19 N 0.0000 1.0000 UG/L 09-JAN-95 RJAC OR950306 R 1,1,1, 2-TETRACHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHANE3 WELL #19 N 0.0000 0.5000 UG/L

001000 September 26, New Mexico Public Water St, .y System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MOL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-95 RJAC OR950306 R 1,1,2-TRICHLOROETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL 119 N 0.0000 0.5000 UG/L R 1.2,3-TRICHLOROBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1.2-DICHLOROETHANE 3 WELL 119 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL 119 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 N 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL 119 N 0.0000 5.0000 UG/L E) R BENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 N 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 3 WELL #19 N 0.0000 2.5000 UG/L R CHLOROFORM 3 WELL #19 N 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL #19 N 0.0000 0.5000 UG/L R D I BROMOCHLOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R D I BROMOMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 3 WELL #19 N 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 N 0.0000 0.5000 UG/L

001001 s September 26 New Mexico Public Water Si. y System Chemical Results Page: 6 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT +/- MDL UNITS THANE) 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-95 RJAC OR950306 R N-BUTYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL 119 N 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 3 WELL 119 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL 119 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL 119 N 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL 119 N 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 N 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 N 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 N 0.0000 5.0000 UG/L R TOLUENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 N 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 3 WELL #19 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 N 0.0000 2.0000 UG/L R XYLENES, TOTAL 3 WELL #19 N 0.0000 1.0000 UG/L 05-APR-95 RJAC OR951735 R 1,1. 1,2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1. 2, 2-TETRACHLOROETHAN3E WELL #19 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL #19 U 0.0000 5.0000 UG/L E)

001002 September 26 New Mexico Public Water Supply System Chemical Results Page: 7 ,L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS

11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 05-APR-95 RJAC OR951735 R BENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 3 WELL #19 U 0.0000 2.5000 UG/L R CHLOROFORM 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R DICHLOROO I FLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R HEXACHLOROBUTAOIENE 3 WELL #19 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R TCYRfteHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 U 0.0000 5.0000 UG/L

001003 September 26, 1- New Mexico Public Water Su^iy System Chemical Results Page: 8 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 05-APR-95 RJAC OR951735 R TOLUENE 3 WELL f 19 U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 3 WELL 119 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL 119 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 3 WELL #19 U 0.0000 1.0000 UG/L 18-AUG-95 RJAC OR953813 R 1,1,1,2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL 119 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1.2,4-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL #19 U 0.0000 5.0000 UG/L E) R BENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROHODICHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROBENZENE (HONOCHLOROBENZE 3 WELL #19 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 3 WELL #19 U 0.0000 2.5000 UG/L R CHLOROFORM 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L

001004 September 26 New Mexico Public Water SUp iy System Chemical Results Page: ,L During the Period Beginning Ol-JUL-9P 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 18-AUG-95 RJAC OR953813 R CIS-1, 3-DICHLOROPROPENE 3 WELL 119 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 3 WELL 119 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 3 WELL 119 U 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 3 WELL #19 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLEWE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 U 0.0000 5.0000 UG/L R TOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 3 WELL #19 U 0.0000 1.0000 UG/L 04-OCT-95 RJAC OR9504379 R 1,1,1,2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1.1-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L

001005 y September 26 New Mexico Public Water Su . ,y System Chemical Results Page: 10 During the Period Beginning Ol-JUL-9fl 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504379 R 1,2,3-TRICHLOROPROPANE 3 WELL 119 U 0.0000 0.5000 UG/L R 1.2,4-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2.4-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL 119 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3.5-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL #19 U 0.0000 5.0000 UG/L E) R BENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMODICHLOROHETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 3 WELL #19 U 0.0000 2.5000 UG/L R CHLOROFORM 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 3 WELL #19 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL #19 U 0.0000 0.5000 UG/L

001006 September 26, New Mexico Public Water Si,, .y System Chemical Results Page: 11 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504379 R 0-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL 119 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 U 0.0000 5.0000 UG/L R TOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRANS-1,2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 3 WELL #19 U 0.0000 1.0000 UG/L 09-JAN-96 RJAC OR9600155 R 1,1,1, 2-TETRACHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1.1 .2, 2-TETRACHLOROETHAN3 E WELL #19 U 0.0000 0.5000 UG/L R 1 , 1 , 2-TRICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 3 WELL #19 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 3 WELL #19 U 0.0000 5.0000 UG/L E) R BENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L

001007 September 26, New Mexico Public Water SiW'Su Viy System Chemical Results Page: 12 During the Period Beginning Ol-JUL-9Kr 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600155 R BROMODICHLOROMETHANE 3 WELL 119 U 0.0000 0.5000 UG/L R BROMOFORM 3 WELL #19 U 0.0000 0.5000 UG/L R BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 3 WELL #19 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROFORM 3 WELL #19 U 0.0000 0.5000 UG/L R CHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 3 WELL #19 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R 01 BROMOMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R ETHYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 3 WELL #19 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 3 WELL #19 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R NAPHTHALENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R STYRENE 3 WELL #19 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 3 WELL #19 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 3 WELL #19 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 3 WELL #19 0.6000 0.5000 UG/L R TETRAHYDROFURAN (THF) 3 WELL #19 U 0.0000. 5.0000 UG/L R TOLUENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRANS-1,Z-DICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 3 WELL #19 U 0.0000 0.5000 UG/L

001008 September 26 New Mexico Public Water suSUHrl>y System Chemical Results Page: 13 .1 During the Period Beginning HrlOl-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600155 R TRICHLOROFLUOROMETHANE 3 WELL #19 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 3 WELL #19 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 3 WELL #19 U 0.0000 0.5000 UG/L 427 rows selected.

001009 September 26 New Mexico Public Water Suppiy System Chemical Results Page: .1 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-JAN-95 RJAC OR950008 R 1,1,1, 2-TETRACHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 4 WELL 120 U 0.0000 0.5000 UG/L R 1,1. 2, 2-TETRACHLOROETHAN4E WELL 120 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 4 WELL 120 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 4 WELL 120 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 4 WELL 120 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 4 WELL 420 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 4 WELL 120 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 4 WELL #20 U 0.0000 5.0000 UG/L E) R BENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R BROHODICHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOFORM 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 4 WELL #20 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 4 WELL #20 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 4 WELL #20 U 0.0000 2.5000 UG/L R CHLOROFORM 4 WELL #20 0.5000 0.5000 UG/L R CHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R CIS-1,3-DICHLOROPROPENE 4 WELL #20 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R ETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 4 WELL #20 U 0.0000 0.5000 UG/L

001010 September 26 New Mexico Public Water Suppiy System Chemical Results Page: .1. During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-JAH-95 RJAC OR950008 R ISOPROPYLBENZENE 4 WELL #20 U 0.0000 0.5000 U6/L R M-DICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 4 WELL #20 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R NAPHTHALENE 4 WELL 120 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 4 WELL 120 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R STYRENE 4 WELL #20 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 4 WELL #20 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 4 WELL #20 U 0.0000 5.0000 UG/L R TOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRANS-1,2-DICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROHETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 4 WELL #20 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 4 WELL #20 U 0.0000 1.0000 UG/L 16- JAN-96 RJAC OR9600272 R 1,1,1,2-TETRACHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2.3-TRICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 4 WELL #20 U 0.0000 0.5000 UG/L

001011 September 26, New Mexico Public Water Sup,..up\ -, / System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 16-JAN-96 RJAC OR9600272 R 2,2-DICHLOROPROPANE 4 WELL 120 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 4 WELL #20 U 0.0000 5.0000 UG/L E) R BENZENE 4 WELL 120 U 0.0000 0.5000 UG/L R BROMOBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R BROMOFORM 4 WELL #20 U 0.0000 0.5000 UG/L R BROMONETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 4 WELL #20 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 4 WELL #20 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R CHLOROFORM 4 WELL #20 U 0.0000 0.5000 UG/L R CHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 4 WELL #20 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R ETHYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 4 WELL #20 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 4 WELL #20 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R NAPHTHALENE 4 WELL #20 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R STYRENE 4 WELL #20 U 0.0000 0.5000 UG/L

001012 September 26 , 19&. New Mexico Public Water SupjKSupp.yy System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 16-JAN-96 RJAC OR9600272 R TERT-BUTYL METHYL ETHER (MTBE) 4 WELL #20 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 4 WELL #20 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 4 WELL #20 U 0.0000 5.0000 UG/L R TOLUENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRANS-1,3-DICHLOROPROPENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 4 WELL #20 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 4 WELL #20 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 4 WELL #20 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 4 WELL #20 U 0.0000 0.5000 UG/L 116 rows selected.

001013 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-AUG-93 CHEE OR931877 C TETRACHLOROETHYLENE 5 HELL 121 T 0.9000 1.0000 UG/L 17-FEB-94 RJAC OR940452 C 1,1,1,2-TETRACHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1,2,2-TETRACHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1,2-TRICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,2,3-TRICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L C BENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C BROMOBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C BROMODICHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C BROMOFORM 5 WELL #21 N 0.0000 0.5000 UG/L C BROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L C CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 N 0.0000 0.5000 UG/L NE) C CHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C CHLOROFORM 5 WELL #21 N 0.0000 0.5000 UG/L C CHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L C CIS-1, 3-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L C DIBROMOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L C ETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C M-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 N 0.0000 0.5000 UG/L THANE) C 0-CHLOROTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE . 5 WELL #21 N 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L C STYRENE 5 WELL #21 N 0.0000 0.5000 UG/L

001014 September 26. 1997 New Mexico Public Water Supply Systea Chenical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 17-FEB-94 RJAC OR940452 C TERT-BUTYL METHYL ETHER (MTBE) 5 WELL 121 N 0.0000 5.0000 UG/L C TETRACHLOROETHYLENE 5 WELL #21 0.8000 0.5000 UG/L C TOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L C TRANS-1,2-DICHLOROETHYLENE 5 HELL #21 N 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L C VINYL CHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L C XYLENES. TOTAL 5 WELL #21 N 0.0000 0.5000 UG/L 21-JUN-94 RJAC OR942017 R 1,1,1,2-TETRACHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-OICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R BENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOOICHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROFORM 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L. R M-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 N 0.0000 0.5000 UG/L THANE)

001015 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 3 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS

11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-JUN-94 RJAC OR942017 R 0-CHLOROTOLUENE 5 WELL 121 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R STYRENE 5 WELL #21 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 N 0.0000 5.0000 UG/L R TETRACHLOROETHYLENE 5 WELL #21 1.0000 0.5000 UG/L R TOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 5 WELL #21 N 0.0000 0.5000 UG/L 10-OCT-94 RJAC OR943330 R 1,1,1, 2-TETRACHLOROETHANE5 WELL #21 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1, 2. 2-TETRACHLOROETHAN5 E WELL #21 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLORDETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 N 0.0000 5.0000 UG/L E) R BENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L

001016 September 26, 1997 New Mexico Public Water Supply Systea Chenical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT */- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 10-OCT-94 RJAC OR943330 R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 N 0.0000 0.5000 UG/L HE) R CHLOROETHANE 5 HELL #21 N 0.0000 2.5000 UG/L R CHLOROFORM 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1 ,3-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R OIBROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R HEXACHLOROBUTAD I EN E 5 WELL #21 N 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 N 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R NAPHTHALENE 5 WELL #21 N 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-DICHLOR08ENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R STYRENE 5 WELL #21 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 N 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 5 HELL #21 1.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 5 HELL #21 N 0.0000 5.0000 UG/L R TOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRANS- 1 , 2-D ICHLOROETH YLEN5 E HELL #21 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 HELL #21 N 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 HELL #21 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 N 0.0000 2.0000 UG/L R XYLENES, TOTAL 5 WELL #21 N 0.0000 1.0000 UG/L 10-JAN-95 RJAC OR950307 R 1 , 1 , 1 , 2-TETRACHLOROETHAN5 WELL E#21 N 0.0000 0. 5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 N 0.0000 0. 5000 UG/L

001017 September 26. 1997 New Mexico Public Water Supply Systen Chemical Results Page: 5 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 10-JAN-95 RJAC OR950307 R 1,1,2,2-TETRACHLOROETHANE 5 WELL 121 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 5 WELL §21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL §21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 HELL #21 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL 121 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL 121 N 0.0000 0.5000 UG/L R 1,2.4-TRICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-OICHLOROETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 1 , 3 , 5-TRIMETHYLBENZEN5E WELL #21 N 0.0000 0.5000 UG/L R 1,3-OICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 N 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 N 0.0000 5.0000 UG/L E) R BENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R BRONOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R BRONODICHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 N 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 N 0.0000 2.5000 UG/L R CHLOROFORM 5 WELL #21 N 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R DIBROMOMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R OICHLORODIFLUOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 N . 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 5 WELL #21 N 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L

001018 September 26, 1997 New Mexico Public Water Supply System Chenical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 10-JAN-95 RJAC OR950307 R METHYLENE CHLORIDE (DICHLOROME 5 WELL f21 N 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL 121 N 0.0000 0.5000 UG/L R NAPHTHALENE 5 WELL 121 N 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL 121 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL 121 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL 121 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL 121 N 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R STYRENE 5 WELL 121 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 N 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 N 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 5 WELL #21 0.7000 0.5000 UG/L R TETRAHYDROFURAN (THF) 5 WELL #21 N 0.0000 5.0000 UG/L R TOLUENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 WELL #21 N 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 WELL #21 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 N 0.0000 2.0000 UG/L R XYLENES, TOTAL 5 WELL #21 N 0.0000 1.0000 UG/L 05-APR-95 RJAC OR951736 R 1,1.1, 2-TETRACHLOROETHANE5 WELL #21 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN5 E WELL #21 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1 , 2 , 4-TRICHLOROBENZEN5E WELL #21 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 U 0.0000 5.0000 UG/L

001019 September 26, 1997 New Mexico Public Water Supply Systea Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/~ MDL UNITS E) 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 05-APR-95 RJAC OR951736 R BENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BRONODICHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE S WELL #21 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 U 0.0000 2.5000 UG/L R CHLOROFORM 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROMETHANE S WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 5 WELL #21 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R NAPHTHALENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R STYRENE 5 WELL #21 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L * TETRACHLOHDETMYLEN5 WELLE #21 1.3000 0.5000 UG/L

001020 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 05-APR-95 RJAC OR951736 R TETRAHYDROFURAN (THF) 5 WELL 121 U 0.0000 5.0000 UG/L R TOLUENE 5 WELL 121 U 0.0000 0.5000 UG/L R TRANS- 1, 2-DICHLOROETHYLENE 5 WELL 121 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 WELL §21 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 5 WELL 121 U 0.0000 1.0000 UG/L 18-AUG-95 RJAC OR953812 R 1 . 1 , 1 , 2-TETRACHLOROETHAN5 WELL #21 E U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN5 EWELL #21 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 U 0.0000 5.0000 UG/L E) R BENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 U 0.0000 2.5000 UG/L R CHLOROFORM 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L

001021 September 26, 1997 New Mexico Public Water Supply Systen Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDf COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 18-AUG-95 RJAC OR953812 R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R HEXACHLOROBUTAOIENE 5 WELL #21 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R NAPHTHALENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R STYRENE 5 WELL #21 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 5 WELL #21 1.2000 0.5000 UG/L R TETRAHYDROFURAN (THF) 5 WELL #21 U 0.0000 5.0000 UG/L R TOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 5 WELL #21 U 0.0000 1.0000 UG/L 04-OCT-95 RJAC OR9504378 R 1,1,1,2-TETRACHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L

001022 September 26, 1997 New Mexico Public Water Supply Systea Chemical Results Page: 10 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT */- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504378 R 1,2,3-TRICHLOROBENZENE 5 WELL 121 U 0.0000 0.5000 UG/L R 1.2.3-TRICHLOROPROPANE 5 WELL 121 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1.2-DICHLOROETHANE 5 WELL 121 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3.5-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL 121 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL 121 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 U 0.0000 5.0000 UG/L E) R BENZENE 5 WELL Kl U 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL 121 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOD ICHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOFORM 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 U 0.0000 2.5000 UG/L R CHLOROFORM 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1. 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 5 WELL #21 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L

001023 September 26, 1997 New Mexico Public Water Supply System Chenical Results Page: 11 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504378 R NAPHTHALENE 5 WELL 121 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL 121 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL 121 U 0.0000 0.5000 UG/L R P-DICHLORDBENZENE 5 WELL 121 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R STYRENE 5 WELL 121 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 5 WELL #21 1.2000 0.5000 UG/L R TETRAHYDROFURAN (THF) 5 WELL #21 U 0.0000 5.0000 UG/L R TOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRANS-1, 2-OICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 5 WELL #21 U 0.0000 1.0000 UG/L 09-JAN-96 RJAC OR9600154 R 1,1,1. 2-TETRACHLOROETHANE5 WELL #21 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1, 2, 2-TETRACHLOROETHAN5 E WELL #21 U 0.0000 0.5000 UG/L R 1.1.2-TRICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1, 2,3-TRICHLOROBENZENE S WELL #21 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE S WELL #21 U 0.0000 0.5000 UG/L R 1,2.4-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 5 WELL #21 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 5 WELL #21 U 0.0000 5.0000 UG/L E) R BENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L

001024 September 26. 1997 New Mexico Public Water Supply Systen Chenlcal Results Page: \2 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600154 R BROMOCHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOOICHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R BROHOFORM 5 WELL #21 U 0.0000 0.5000 UG/L R BROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 5 WELL #21 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROFORM 5 WELL #21 U 0.0000 0.5000 UG/L R CHLOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOCHLOROHETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R ETHYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 5 WELL #21 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 5 WELL #21 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R NAPHTHALENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 5 WELL #21 U 0.0000 0,5000 UG/L R SEC-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R STYRENE 5 WELL #21 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 5 WELL #21 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 5 WELL #21 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 5. WELL #21 1.1000 0.5000 UG/L R TETRAHYDROFURAN (THF) 5 WELL #21 U 0.0000 5.0000 UG/L R TOLUENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L

001025 September 26, 1997 New Mexico Public Water Supply System Chemical Results Page: 13 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-96 RJAC OR9600154 R TRICHLOROETHYLENE 5 WELL #21 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 5 WELL #21 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 5 WELL #21 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 5 WELL #21 U 0.0000 0.5000 UG/L 428 rows selected.

j

001026 October 28, 1997 New Mexico Public Water Supplcy System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941144 R 1,1,1, 2-TETRACHLOROETHAN E 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1-OICHLOROETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 10 WELL #26 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 10 WELL #26 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 10 WELL #26 N 0.0000 0.5000 UG/L R BENZENE 10 WELL #26 N 0.0000 0.5000 UG/L R BRONOBENZENE 10 WELL #26 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 10 WELL #26 N 0.0000 0.5000 UG/L R BROMOFORM 10 WELL #26 N 0.0000 0.5000 UG/L R BROMOMETHANE 10 WELL #26 N 0. 0000 0.5000 UG/L R CARBON TETRACHLORIDE 10 WELL #26 N 0. 0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 10 WELL #26 N 0.0000 0. 5000 UG/L HE) R CHLOROETHANE 10 WELL #26 N 0. 0000 0. 5000 UG/L R CHLOROFORM 10 WELL #26 N 0. 0000 0. 5000 UG/L R CHLOROMETHANE 10 WELL #26 N 0. 0000 0. 5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R CIS-1 ,3-DICHLOROPROPENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R D I BROMOCHLOROMETHAN E 10 WELL #26 N 0. 0000 0. 5000 UG/L R ETHYLBENZENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 10 WELL #26 N 0.0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 10 WELL #26 N 0. 0000 0. 5000 UG/L THANE) R 0-CHLOROTOLUENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R STYRENE 10 WELL #26 N 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 10 WELL #26 N 0. 0000 5. 0000 UG/L

001027 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT V MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941144 RTETRACHLOROETHYLENE 10 WELL #26 N 0.0000 0.5000 UG/L R TOLUENE 10 WELL #26 N 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 10 WELL #26 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 10 WELL #26 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 10 WELL #26 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 10 WELL #26 N 0.0000 0.5000 UG/L ll-JAN-95 RJAC OR950471 R 1 , 1 , 1 , 2-TETRACHLOROETHAN10 WELEL #26 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R 1 , 1 , 2 , 2-TETRACHLOROETHAN10 WELEL #26 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,2. 3-TRICHLOROPROPANE10 WELL #26 U 0.0000 0.5000 UG/L R 1 , 2 , 4-TRICHLOROBENZEN10E WELL #26 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R 1,2-DICHLOROPROPANE 10 WELL #26 U 0.0000 0. 5000 UG/L R 1,3, 5-TRIMETHYLBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R 1,3-DICHLOROPROPANE 10 WELL #26 U 0.0000 0. 5000 UG/L R 2,2-DICHLOROPROPANE 10 WELL #26 U 0.0000 0. 5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 10 WELL #26 U 0.0000 5. 0000 UG/L E) R BENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOCHLOROMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMODICHLOROMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOFORM 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R CARBON TETRACHLORIDE 10 WELL #26 U 0.0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 10 WELL #26 U 0.0000 0. 5000 UG/L NE) R CHLOROETHANE 10 WELL #26 U 0.0000 2. 5000 UG/L R CHLOROFORM 10 WELL #26 U 0.0000 0. 5000 UG/L R CHLOROMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R CIS-1.2-DICHLOROETHYLENE 10 WELL #26 U 0.0000 0. 5000 UG/L

001028 October 28, 1997 r New Mexico Public Water Supply System Chemical Results Page: 3 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC ll-JAN-95 RJAC OR950471 R CIS-1, 3-DICHLOROPROPENE 10 WELL 126 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R ETHYLBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 10 WELL #26 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 10 WELL #26 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R NAPHTHALENE 10 WELL #26 U 0.0000 0. 5000 UG/L R 0-CHLOROTOLUENE 10 WELL #26 U 0.0000 0. 5000 UG/L R 0-DICHLOROBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R P-CHLOROTOLUENE 10 WELL #26 U 0.0000 0. 5000 UG/L R P-DICHLOROBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R P-ISOPROPYLTOLUENE 10 WELL #26 U 0.0000 0. 5000 UG/L R SEC-BUTYLBENZENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R STYRENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 10 WELL #26 U 0. 0000 5. 0000 UG/L R TERT-BUTYLBENZENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TETRACHLOROETHYLENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 10 WELL #26 U 0. 0000 5. 0000 UG/L R TOLUENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TRANS-1 ,2-DICHLOROETHYLENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TRICHLOROETHYLENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R VINYL CHLORIDE 10 WELL #26 U 0. 0000 2. 0000 UG/L R XYLENES, TOTAL 10 WELL #26 U 0. 0000 1. 0000 UG/L 21-FEB-96 RJAC OR9600792 R1 , 1 , 1 , 2-TETRACHLOROETHAN10 WELLE #26 U 0. 0000 0. 5000 UG/L R 1,1, 1-TRICHLOROETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R 1 , 1 ,2, 2-TETRACHLOROETHAN10 WELE L #26 U 0. 0000 0. 5000 UG/L R 1,1, 2-TRICHLOROETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R 1,1-DICHLOROETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R 1,1-DICHLOROETHYLENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R 1,1-DICHLOROPROPENE 10 WELL #26 U o. 0000 0. 5000 UG/L R 1,2,3-TRICHLOROBENZENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R 1,2, 3-TRICHLOROPROPANE 10 WELL #26 U 0. 0000 0. 5000 UG/L

001029 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600792 R 1,2,4-TRICHLOROBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,2, 4-TRIMETHYLBENZENE10 WELL 126 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 10 WELL 126 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 10 WELL 126 U 0.0000 0.5000 UG/L R 1,3, 5-TRIMETHYLBENZENE 10 WELL #26 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 10 WELL #26 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 10 WELL #26 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 10 WELL #26 U 0.0000 5.0000 UG/L E) R BENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOCHLOROMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOOICHLOROMETHANE 10 WELL #26 U 0.0000 0.5000 UG/L R BROMOFORM 10 WELL #26 U 0.0000 0. 5000 UG/L R BROMOMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R CARBON TETRACHLORIDE 10 WELL #26 U 0.0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 10 WELL #26 U 0. 0000 0. 5000 UG/L NE) R CHLOROETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R CHLOROFORM 10 WELL #26 U 0. 0000 0. 5000 UG/L R CHLOROMETHANE 10 WELL #26 U 0. 0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R CIS-1, 3-DICHLOROPROPENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R DIBROMOCHLOROMETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R DIBROMOMETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R D I CHLOROD I FLUOROMETHANE 10 WELL #26 U 0. 0000 0. 5000 UG/L R ETHYLBENZENE 10 WELL #26 U 0. 0000 0. 5000 UG/L R HEXACHLOROBUTAD I EN E 10 WELL #26 U 0. 0000 0. 5000 UG/L R ISOPROPYLBENZENE 10 WELL #26 u 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 10 WELL #26 u 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 10 WELL #26 u 0. 0000 0. 5000 UG/L THANE) R N-BUTYLBENZENE 10 WELL #26 u 0. 0000 0. 5000 UG/L R N-PROPYLBENZENE 10 WELL #26 u 0. 0000 0. 5000 UG/L R NAPHTHALENE 10 WELL #26 u 0. 0000 0.5000 UG/L R 0-CHLOROTOLUENE 10 WELL #26 u 0. 0000 0. 5000 UG/L

001030 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600792 R 0-DICHLOROBENZENE 10 WELL 126 U 0.0000 0. 5000 UG/L R P-CHLOROTOLUENE 10 WELL 126 U 0.0000 0. 5000 UG/L R P-DICHLOROBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R P-ISOPROPYLTOLUENE 10 WELL #26 U 0.0000 0. 5000 UG/L R SEC-BUTYLBENZENE 10 WELL 126 U 0.0000 0. 5000 UG/L R STYRENE 10 WELL 126 U 0.0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 10 WELL 126 U 0.0000 5. 0000 UG/L R TERT-BUTYLBENZENE 10 WELL #26 U 0.0000 0. 5000 UG/L R TETRACHLOROETHYLENE 10 WELL 126 U 0.0000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 10 WELL #26 U 0.0000 5. 0000 UG/L R TOLUENE 10 WELL 126 U 0.0000 0. 5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 10 WELL #26 U 0.0000 0. 5000 UG/L R TRANS-1 , 3-DICHLOROPROPEN1E0 WELL #26 U 0.0000 0. 5000 UG/L R TRICHLOROETHYLENE 10 WELL #26 U 0.0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 10 WELL #26 U 0.0000 0. 5000 UG/L R VINYL CHLORIDE 10 WELL #26 U 0.0000 0. 5000 UG/L R XYLENES, TOTAL 10 WELL #26 U 0.0000 0. 5000 UG/L 157 rows selected.

001031 September 26 New Mexico Public Water Supply System Chemical Results Page: 1 ,L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-AU6-93 CHEE OR931878 C TETRACHLOROETHYLENE 11 WELL #27 1.4000 1.0000 UG/L C TETRACHLOROETHYLENE 11 WELL #27 1.4000 1.0000 UG/L 16-MAY-94 RJAC OR941558 R 1,1,1, 2-TETRACHLOROETHAN11 E WELL #27 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,1, 2 , 2-TETRACHLOROETHAN11 WELEL #27 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L R BENZENE 11 WELL #27 N 0.0000 0.5000 UG/L R BROMOBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L R BROMOFORM n WELL #27 N 0. 0000 0.5000 UG/L R BROMOHETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L R CARBON TETRACHLORIDE 11 WELL #27 N 0. 0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 11 WELL #27 N 0. 0000 0.5000 UG/L NE) R CHLOROETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L R CHLOROFORM 11 WELL #27 N 0. 0000 0.5000 UG/L R CHLOROMETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R CIS-1, 3-DICHLOROPROPENE 11 WELL #27 N 0. 0000 0.5000 UG/L R D I BROMOCHLOROMETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L R ETHYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 N 0. 0000 0. 5000 UG/L THANE) R 0-CHLOROTOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L

001032 September 26, 19s/ New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT v- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 16-MAY-94 RJAC OR941558 R STYRENE 11 WELL 127 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 N 0.0000 5.0000 UG/L R TETRACHLOROETHYLENE 11 WELL #27 0.7000 0.5000 UG/L R TOLUENE 11 WELL 127 N 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 11 WELL #27 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 11 WELL #27 N 0.0000 0.5000 UG/L 21-JUN-94 RJAC OR942018 C 1,1,1, 2-TETRACHLOROETHAN11 E WELL #27 N 0.0000 0.5000 UG/L C 1,1,1-TRICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,1,2, 2-TETRACHLOROETHAN11E WELL #27 N 0.0000 0.5000 UG/L C 1.1,2-TRICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,1-DICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,1-DICHLOROPROPENE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,2, 3-TRICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,2,4-TRICHLOROBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,2-DICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,2-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L C 1,3-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L C 2,2-DICHLOROPROPANE 11 WELL #27 N 0.0000 0.5000 UG/L C BENZENE 11 WELL #27 N 0.0000 0.5000 UG/L C BROMOBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L C BRONODICHLOROMETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C BROHOFORM 11 WELL #27 N 0.0000 0.5000 UG/L C BROMOMETHANE 11 WELL #27 N 0.0000 0.5000 UG/L C CARBON TETRACHLORIDE 11 WELL #27 N 0.0000 0.5000 UG/L c CHLOROBENZENE (MONOCHLOROBENZE 11 WELL #27 N 0.0000 0.5000 UG/L NE) c CHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L c CHLOROFORM 11 WELL #27 N 0.0000 0.5000 UG/L c CHLOROMETHANE 11 WELL #27 N 0.0000 0.5000 UG/L c C IS- 1 , 2-D ICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L c CIS-1, 3-DICHLOROPROPENE 11 WELL #27 N 0.0000 0.5000 UG/L c D IBROMOCHLOROMETHANE 11 WELL #27 N 0.0000 0.5000 UG/L c ETHYLBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L c M-DICHLOROBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L c METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 N 0.0000 0.5000 UG/L

001033 September 26, New Mexico Public Water Suj, ./ System Chemical Results Page: 3 During the Period Beginning Ol-JUL-9r 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS THANE) 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-JUN-94 RJAC OR942018 C 0-CHLOROTOLUENE 11 WELL #27 N 0.0000 0.5000 UG/L C 0-DICHLOROBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L C P-CHLOROTOLUENE 11 WELL #27 N 0.0000 0.5000 UG/L C P-DICHLOROBENZENE 11 WELL #27 N 0.0000 0.5000 UG/L C STYRENE 11 WELL #27 N 0.0000 0.5000 UG/L C TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 N 0.0000 5.0000 UG/L C TETRACHLOROETHYLENE 11 WELL #27 0.7000 0.5000 UG/L C TOLUENE 11 WELL #27 N 0.0000 0.5000 UG/L C TRANS-1.2-DICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L C TRICHLOROETHYLENE 11 WELL #27 N 0.0000 0.5000 UG/L C VINYL CHLORIDE 11 WELL #27 N 0.0000 0.5000 UG/L C XYLENES, TOTAL 11 WELL #27 N 0. 0000 0.5000 UG/L 03-OCT-94 RJAC OR943168 M1 , 1 , 1 , 2-TETRACHLOROETHAN11 WELL #2E7 N 0. 0000 0.5000 UG/L M 1,1,1-TRICHLOROETHANE 11 WELL #27 N 0.0000 0.5000 UG/L M 1 , 1 ,2, 2-TETRACHLOROETHAN11 WELEL #27 N 0. 0000 0. 5000 UG/L M 1,1,2-TRICHLOROETHANE 11 WELL #27 N 0. 0000 0.5000 UG/L M 1,1-DICHLOROETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,1-DICHLOROETHYLENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1.1-DICHLOROPROPENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,2,3-TRICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1.2, 3-TRICHLOROPROPANE11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,2, 4-TRICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,2,4-TRIMETHYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,2-DICHLOROETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1,2-DICHLOROPROPANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 1 , 3 , 5-TRIMETHYLBENZEN11 EWELL #27 N 0. 0000 0. 5000 UG/L M 1,3-DICHLOROPROPANE 11 WELL #27 N 0. 0000 0.5000 UG/L M 2,2-DICHLOROPROPANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 2-BUTANONE (METHYL ETHYL KETON 11 WELL #27 N 0. 0000 5. 0000 UG/L E) M BENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M BROMOBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M BROMOCHLOROMETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M BROMODICHLOROMETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M BROMOFORM 11 WELL #27 N 0.0000 0. 5000 UG/L M BROMOMETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L

001034 September 26, New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MOL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 03-OCT-94 RJAC OR943168 M CARBON TETRACHLORIDE 11 WELL #27 N 0.0000 0.5000 UG/L M CHLOROBENZENE (MONOCHLOROBENZE 11 WELL 127 N 0.0000 0.5000 UG/L NE) M CHLOROETHANE 11 WELL #27 N 0.0000 2.5000 UG/L M CHLOROFORM 11 WELL #27 N 0.0000 0.5000 UG/L M CHLOROHETHANE 11 WELL #27 N 0.0000 0.5000 UG/L M CIS-1 ,2-DICHLOROETHYLENE 11 WELL #27 N 0.0000 0. 5000 UG/L M CIS-1, 3-DICHLOROPROPENE 11 WELL #27 N 0.0000 0. 5000 UG/L M 0 I BROMOCHLOROMETHANE 11 WELL #27 N 0.0000 0. 5000 UG/L M DIBROMOMETHANE 11 WELL #27 N 0.0000 0. 5000 UG/L M D ICHLORODI FLUOROMETHANE 11 WELL #27 N 0.0000 0. 5000 UG/L M ETHYLBENZENE 11 WELL #27 N 0. 0000 0.5000 UG/L M HEXACHLOROBUTADIENE 11 WELL #27 N 0.0000 0. 5000 UG/L M ISOPROPYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M M-DICHLOROBENZENE 11 WELL #27 N 0.0000 0. 5000 UG/L M METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 N 0. 0000 0. 5000 UG/L THANE) M N-BUTYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M NAPHTHALENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 0-CHLOROTOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M 0-DICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M P-CHLOROTOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M P-DICHLOROBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M P-ISOPROPYLTOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M SEC-BUTYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M STYRENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 N 0. 0000 5. 0000 UG/L M TERT-BUTYLBENZENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M TETRACHLOROETHYLENE 11 WELL #27 0. 6000 0. 5000 UG/L M TETRAHYDROFURAN (THF) 11 WELL #27 N 0. 0000 5. 0000 UG/L M TOLUENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M TRANS- 1 , 2-DICHLOROETHYLEN11 WELE L #27 N 0. 0000 0. 5000 UG/L M TRICHLOROETHYLENE 11 WELL #27 N 0. 0000 0. 5000 UG/L M TRICHLOROFLUOROMETHANE 11 WELL #27 N 0. 0000 0. 5000 UG/L M VINYL CHLORIDE 11 WELL #27 N 0.0000 2. 0000 UG/L M XYLENES, TOTAL 11 WELL #27 N 0. 0000 1. 0000 UG/L 09-MAY-95 RJAC OR952367 R 1,1,1. 2-TETRACHLOROETHAN11 EWELL #27 U 0. 0000 0. 5000 UG/L

001035 September 26 New Mexico Public Water Supplr y System Chemical Results Page: ,L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-MAY-95 RJAC OR952367 R 1,1,1-TRICHLOROETHANE 11 WELL 127 U 0.0000 0.5000 UG/L R 1 , 1 ,2,2-TETRACHLOROETHAN11 WELE L 127 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 11 WELL 127 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 11 WELL 127 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2.3-TRICHLOROBENZENE 11 WELL 127 U 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 11 WELL 127 U 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 11 WELL 127 U 0. 0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 11 WELL #27 U 0. 0000 0.5000 UG/L R 1,3, 5-TRIMETHYLBENZENE11 WELL #27 U 0. 0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 11 WELL #27 U 0. 0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 11 WELL #27 U 0. 0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 11 WELL #27 U 0. 0000 5. 0000 UG/L E) R BENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R BROMOBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R BROMOCHLOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R BROMOOICHLOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R BROMOFORM 11 WELL #27 U 0. 0000 0. 5000 UG/L R BROMOMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R CARBON TETRACHLORIDE 11 WELL #27 U 0. 0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 11 WELL #27 U 0. 0000 0. 5000 UG/L NE) R CHLOROETHANE 11 WELL #27 U 0. 0000 2. 5000 UG/L R CHLOROFORM 11 WELL #27 U 0. 0000 0. 5000 UG/L R CHLOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R CIS-1, 3-DICHLOROPROPENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R OIBROMOCHLOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R DIBROMOMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R DICHLORODIFLUOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R ETHYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R HEXACHLOROBUTADI ENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R ISOPROPYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L

001036 September 26 New Mexico Public Water Sup iy System Chemical Results Page: ,L During the Period Beginning Ol-JUL-9H 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-MAY-95 RJAC OR952367 R M-DICHLOROBENZENE 11 WELL 127 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 11 WELL 127 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R NAPHTHALENE 11 WELL 127 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-OICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R STYRENE 11 WELL #27 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 11 WELL #27 0.8000 0.5000 UG/L R TETRAHYDROFURAN (THF) 11 WELL #27 U 0.0000 5.0000 UG/L R TOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R TRANS-1 ,2-DICHLOROETHYLENE 11 WELL #27 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 11 WELL #27 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 11 WELL #27 U 0. 0000 0.5000 UG/L R VINYL CHLORIDE 11 WELL #27 U 0. 0000 2.0000 UG/L R XYLENES, TOTAL 11 WELL #27 U 0. 0000 1.0000 UG/L 18-AUG-95 RJAC OR953816 R1,1.1, 2-TETRACHLOROETHAN11 EWELL #27 U 0. 0000 0. 5000 UG/L R 1,1,1-TRICHLOROETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1 , 1 , 2 , 2-TETRACHLOROETHAN11 WELLE #27 U 0. 0000 0. 5000 UG/L R 1,1,2-TRICHLOROETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1.1-DICHLOROETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,1-DICHLOROETHYLENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1.1-DICHLOROPROPENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,2,3-TRICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1.2. 3-TRICHLOROPROPAN1E1 WELL #27 U 0. 0000 0. 5000 UG/L R 1,2,4-TRICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,2,4-TRIMETHYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,2-DICHLOROETHANE 11 WELL. #27 U 0. 0000 0. 5000 UG/L R 1.2-DICHLOROPROPANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,3,5-TRIMETHYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,3-DICHLOROPROPANE 11 WELL #27 U 0. 0000 0. 5000 UG/L

001037 September 26 New Mexico Public Water Sup^Jupr'Vy System Chemical Results Page: .L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MOL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 18-AUG-95 RJAC OR953816 R 2,2-DICHLOROPROPANE 11 WELL *27 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 11 WELL 127 U 0.0000 5.0000 UG/L E) R BENZENE 11 WELL 127 U 0.0000 0.5000 UG/L R BROMOBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 11 WELL §27 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R BROMOFORM 11 WELL 127 U 0.0000 0.5000 UG/L R BROMOMETHANE 11 WELL f27 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 11 WELL 127 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 11 WELL #27 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 11 WELL #27 U 0.0000 2.5000 UG/L R CHLOROFORM 11 WELL #27 U 0.0000 0.5000 UG/L R CHLOROMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 11 WELL #27 U 0.0000 0.5000 UG/L R CIS-1, -3-DICHLOROPROPENE 11 WELL #27 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R ETHYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 11 WELL #27 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R NAPHTHALENE 11 WELL #27 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 11 WELL #27 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R STYRENE 11 WELL #27 U 0.0000 0.5000 UG/L

001038 September 26 New Mexico Public Water Sup iy System Chemical Results Page: 8 , L During the Period Beginning Ol-JUL-9H 3 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 18-AUG-95 RJAC OR953816 R TERT-BUTYL METHYL ETHER (MTBE) 11 WELL 127 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 11 WELL 127 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 11 WELL 127 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 11 WELL 127 U 0.0000 5.0000 UG/L R TOLUENE 11 WELL *27 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 11 WELL 127 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 11 WELL #27 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 11 WELL 127 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 11 WELL 127 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 11 WELL 127 U 0.0000 1.0000 UG/L 04-OCT-95 RJAC OR9504377 R1,1, 1 , 2-TETRACHLOROETHAN11 WELEL 127 U 0.0000 0.5000 UG/L R 1,1, 1-TRICHLOROETHANE 11 WELL 127 U 0.0000 0.5000 UG/L R 1 , 1 ,2, 2-TETRACHLOROETHAN11 WELEL 127 U 0.0000 0.5000 UG/L R 1 , 1 ,2-TRICHLOROETHAN11E WELL 127 U 0.0000 0. 5000 UG/L R 1,1-DICHLOROETHANE 11 WELL 127 U 0.0000 0. 5000 UG/L R 1,1-DICHLOROETHYLENE 11 WELL 127 U 0.0000 0. 5000 UG/L R 1,1-DICHLOROPROPENE 11 WELL 127 U 0.0000 0. 5000 UG/L R 1 , 2, 3-TRICHLOROBENZENE11 WELL 127 U 0.0000 0. 5000 UG/L R 1 , 2 , 3-TRICHLOROPROPAN11 EWELL 127 U 0. 0000 0. 5000 UG/L R 1,2, 4-TRICHLOROBENZENE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 1,2,4-TRIMETHYLBENZENE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 1,2-DICHLOROETHANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 1,2-DICHLOROPROPANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 1.3,5-TRIMETHYLBENZENE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 1,3-DICHLOROPROPANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 2,2-DICHLOROPROPANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 11 WELL *27 U 0. 0000 5. 0000 UG/L E) R BENZENE 11 WELL i27 U 0. 0000 0. 5000 UG/L R BROMOBENZENE 11 WELL 127 U 0. 0000 0. 5000 UG/L R BROMOCHLOROMETHANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R BROMOOICHLOROMETHANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R BROMOFORM 11 WELL 127 0. 9800 0. 5000 UG/L R BROMOMETHANE 11 WELL 127 U 0. 0000 0. 5000 UG/L R CARBON TETRACHLORIDE 11 WELL *27 U 0. 0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 11 WELL 127 U 0. 0000 0. 5000 UG/L NE)

001039 September 26 New Mexico Public Water Supply System Chemical Results Page: 9 ,L During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT IDI COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 04-OCT-95 RJAC OR9504377 R CHLOROETHANE 11 WELL 127 U 0.0000 2.5000 UG/L R CHLOROFORM 11 WELL 127 U 0.0000 0.5000 UG/L R CHLOROMETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 11 WELL 127 U 0.0000 0.5000 UG/L R CIS-1. 3-DICHLOROPROPENE 11 WELL 127 U 0.0000 0. 5000 UG/L R DIBROMOCHLOROMETHANE 11 WELL 127 U 0.0000 0. 5000 UG/L R DIBROMOMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R DICHLORODIFLUOROMETHANE 11 WELL 127 U 0.0000 0. 5000 UG/L R ETHYLBENZENE 11 WELL 127 U 0.0000 0. 5000 UG/L R HEXACHLOROBUTADIENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R ISOPROPYLBENZENE 11 WELL 127 U 0.0000 0. 5000 UG/L R M-DICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 U 0. 0000 0. 5000 UG/L THANE) R N-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R N-PROPYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R NAPHTHALENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 0-CHLOROTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-ISOPROPYLTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R SEC-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R STYRENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 U 0. 0000 5. 0000 UG/L R TERT-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TETRACHLOROETHYLENE 11 WELL #27 0. 8000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 11 WELL #27 U 0.0000 5. 0000 UG/L R TOLUENE 11 WELL #27 U 0.0000 0. 5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TRICHLOROETHYLENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R VINYL CHLORIDE 11 WELL #27 U 0. 0000 2. 0000 UG/L R XYLENES, TOTAL 11 WELL #27 U 0. 0000 1. 0000 UG/L 23-FEB-96 RJAC OR9600918 R1 , 1 , 1 , 2-TETRACHLOROETHAN11 WELLE #27 U 0. 0000 0. 5000 UG/L R 1,1,1-TRICHLOROETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 1,1,2. 2-TETRACHLOROETHAN11 EWELL #27 U 0. 0000 0. 5000 UG/L R 1,1,2-TRICHLOROETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L

001040 September 26, New Mexico Public Water Supply System Chemical Results Page: 10 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 23-FEB-96 RJAC OR9600918 R 1,1-DICHLOROETHANE 11 WELL 127 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1.2,3-TRICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,3.5-TRIMETHYLBENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R 1,3-OICHLOROPROPANE 11 WELL #27 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 11 WELL #27 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 11 WELL #27 U 0.0000 5.0000 UG/L E) R BENZENE 11 WELL #27 U 0.0000 0.5000 UG/L R BROMOBENZENE 11 WELL #27 U 0.0000 0. 5000 UG/L R BROMOCHLOROMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R BROMODICHLOROMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R BROMOFORM 11 WELL #27 U 0.0000 0. 5000 UG/L R BROMOHETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R CARBON TETRACHLORIDE 11 WELL #27 U 0.0000 0. 5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 11 WELL #27 U 0.0000 0. 5000 UG/L NE) R CHLOROETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R CHLOROFORM 11 WELL #27 U 0.0000 0. 5000 UG/L R CHLOROMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 11 WELL #27 U 0.0000 0. 5000 UG/L R CIS-1 ,3-DICHLOROPROPENE 11 WELL #27 U 0.0000 0. 5000 UG/L R D I BROMOCHLOROMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R DIBROMOMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R DICHLORODIFLUOROMETHANE 11 WELL #27 U 0.0000 0. 5000 UG/L R ETHYLBENZENE 11 WELL #27 U 0.0000 0. 5000 UG/L R HEXACHLOROBUTAO I ENE 11 WELL #27 U 0.0000 0. 5000 UG/L R ISOPROPYLBENZENE 11 WELL #27 U 0.0000 0. 5000 UG/L R M-DICHLOROBENZENE 11 WELL #27 U 0.0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 11 WELL #27 U 0.0000 0. 5000 UG/L THANE)

001041 September 26, \ New Mexico Public Water SV.. iy System Chemical Results Page: 11 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MDL UNITS

11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 23-FEB-96 RJAC OR9600918 R N-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R N-PROPYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R NAPHTHALENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 0-CHLOROTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R P-ISOPROPYLTOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R SEC-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R STYRENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 11 WELL #27 U 0. 0000 5. 0000 UG/L R TERT-BUTYLBENZENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TETRACHLOROETHYLENE 11 WELL #27 1. 0000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 11 WELL #27 U 0. 0000 5. 0000 UG/L R TOLUENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TRANS- 1 , 2-DICHLOROETHYLEN11 WELEL #27 U 0. 0000 0. 5000 UG/L R TRANS-1.3-DICHLOROPROPENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TRICHLOROETHYLENE 11 WELL #27 U 0. 0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 11 WELL #27 U 0. 0000 0. 5000 UG/L R VINYL CHLORIDE 11 WELL #27 U 0. 0000 0. 5000 UG/L R XYLENES, TOTAL 11 WELL #27 U 0. 0000 0. 5000 UG/L 374 rows selected.

001042 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941145 R 1,1, 1 ,2-TETRACHLOROETHAN12 EWELL 128 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 12 WELL 128 N 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHAN12 E WELL #28 N 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1 , 1-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 12 WELL 128 N 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 12 WELL 128 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 12 WELL 128 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1 , 3-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R BENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOFORM 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 12 WELL #28 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 12 WELL #28 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R CHLOROFORM 12 WELL #28 N 0.0000 0.5000 UG/L R CHLOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R CIS-1.3-DICHLOROPROPENE 12 WELL #28 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R ETHYLBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 12 WELL #28 N 0.0000 0.5000 UG/L THANE) R 0-CHLOROTOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R STYRENE 12 WELL #28 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 12 WELL #28 N 0.0000 5.0000 UG/L

001043 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: 2 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/" MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941145 R TETRACHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R TOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 12 WELL #28 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 12 WELL #28 N 0.0000 0.5000 UG/L 09-JAN-95 RJAC OR950305 R 1,1, 1 ,2-TETRACHLOROETHAN12 EWELL 128 N 0.0000 0.5000 UG/L R 1 , 1, 1-TRICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHAN12E WELL #28 N 0.0000 0.5000 UG/L R 1,1, 2-TRICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1 ,2,4-TRIMETHYLBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 1,3, 5-TRIMETHYLBENZENE12 WELL #28 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 12 WELL #28 N 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 12 WELL #28 N 0.0000 5.0000 UG/L E) R BENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOFORM 12 WELL #28 N 0.0000 0.5000 UG/L R BROMOMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 12 WELL #28 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 12 WELL #28 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 12 WELL #28 N 0.0000 2.5000 UG/L R CHLOROFORM 12 WELL #28 N 0.0000 0.5000 UG/L R CHLOROMETHANE 12 WELL #28 N 0.0000 0. 5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0. 5000 UG/L

001044 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/' MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-JAN-95 RJAC OR950305 R CIS-1, 3-DICHLOROPROPENE 12 WELL 128 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 12 WELL 128 N 0.0000 0.5000 UG/L R DIBROMOMETHANE 12 WELL 128 N 0.0000 0.5000 UG/L R D I CHLOROO I FLUOROMETHAN E 12 WELL #28 N 0.0000 0.5000 UG/L R ETHYLBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 12 WELL #28 N 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 12 WELL 128 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 12 WELL 128 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 12 WELL 128 N 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 12 WELL f28 N 0.0000 0.5000 UG/L R NAPHTHALENE 12 WELL #28 N 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 12 WELL 128 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R STYRENE 12 WELL #28 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 12 WELL #28 N 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 12 WELL #28 N 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 12 WELL #28 N 0.0000 5.0000 UG/L R TOLUENE 12 WELL #28 N 0.0000 0.5000 UG/L R TRANS-1,2-DICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 12 WELL #28 N 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 12 WELL #28 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 12 WELL #28 N 0.0000 2.0000 UG/L R XYLENES, TOTAL 12 WELL #28 N 0.0000 1.0000 UG/L 21-FEB-96 RJAC OR9600793 R1,1,1, 2-TETRACHLOROETHAN12E WELL #28 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R 1 , 1 , 2 , 2-TETRACHLOROETHAN12 WELEL 128 U 0.0000 0.5000 UG/L R 1 , 1 ,2-TRICHLOROETHANE12 WELL #28 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 12 WELL #28 U 0.0000 0.5000 UG/L

001045 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 US CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600793 R1,2,4-TRICHLOROBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 12 WELL 128 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R 1.2-DICHLOROPROPANE 12 WELL #28 U 0.0000 0.5000 UG/L R 1,3. 5-TRIMETHYLBENZEN1E2 WELL 128 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 12 WELL 128 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 12 WELL #28 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 12 WELL #28 U 0.0000 5.0000 UG/L E) R BENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R BROMOBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R BRONODICHLOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R BROMOFORM 12 WELL #28 U 0.0000 0.5000 UG/L R BROMOMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 12 WELL #28 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 12 WELL #28 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R CHLOROFORM 12 WELL #28 U 0.0000 0.5000 UG/L R CHLOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 12 WELL #28 U 0.0000 0.5000 UG/L R CIS-1. 3-DICHLOROPROPENE 12 WELL #28 U 0.0000 0.5000 UG/L R D I BROMOCHLOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R D I CHLOROO I FLUOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R ETHYLBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADI ENE 12 WELL #28 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 12 WELL #28 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R NAPHTHALENE 12 WELL #28 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 12 WELL #28 U 0.0000 0.5000 UG/L

001046 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT MOL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600793 R 0-DICHLOROBENZENE 12 WELL 128 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 12 WELL 128 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 12 WELL #28 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 12 WELL #28 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 12 WELL KB U 0.0000 0.5000 UG/L R STYRENE 12 WELL 128 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 12 WELL #28 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 12 WELL 128 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 12 WELL #28 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 12 WELL 128 U 0.0000 5.0000 UG/L R TOLUENE 12 WELL #28 U 0.0000 0.5000 UG/L R TRANS-1,2-OICHLOROETHYLENE 12 WELL #28 U 0.0000 0.5000 UG/L R TRANS-1,3-DICHLOROPROPENE 12 WELL #28 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 12 WELL #28 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 12 WELL #28 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 12 WELL #28 U 0.0000 0.5000 UG/L R XYLENES, TOTAL 12 WELL #28 U 0.0000 0.5000 UG/L 157 rows selected.

001047 October 28, 1997 New Mexico Public Water Supply System Chemical Results f Page: 1 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941148 R 1,1,1, 2-TETRACHLOROETHAN25 EWELL #54 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1 , 1 , 2 , 2-TETRACHLOROETHAN25 WELL 154 E N 0.0000 0.5000 UG/L R 1,1, 2-TRICHLOROETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,2-OICHLOROPROPANE 25 WELL #54 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 25 WELL #54 N 0.0000 0.5000 UG/L R 2,2-OICHLOROPROPANE 25 WELL #54 N 0.0000 0.5000 UG/L R BENZENE 25 WELL #54 N 0.0000 0.5000 UG/L R BROMOBENZENE 25 WELL #54 N 0.0000 0.5000 UG/L R BROMOOICHLOROMETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R BROMOFORM 25 WELL #54 N 0.0000 0.5000 UG/L R BROMOMETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 25 WELL #54 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 25 WELL #54 N 0.0000 0.5000 UG/L HE) R CHLOROETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R CHLOROFORM 25 WELL #54 N 0.0000 0.5000 UG/L R CHLOROMETHANE 25 WELL #54 N 0.0000 0.5000 UG/L R CIS-1 , 2-DICHLOROETHYLENE25 WELL #54 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 25 WELL #54 N 0.0000 0. 5000 UG/L R DIBROMOCHLOROMETHANE 25 WELL #54 N 0. 0000 0. 5000 UG/L R ETHYLBENZENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 25 WELL #54 N 0. 0000 0. 5000 UG/L THANE) R 0-CHLOROTOLUENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R STYRENE 25 WELL #54 N 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 25 WELL #54 N 0. 0000 5. 0000 UG/L

001048 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: 2 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941148 R TETRACHLOROETHYLENE 25 WELL #54 N 0.0000 0.5000 UG/L R TOLUENE 25 WELL #54 N 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 25 WELL #54 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 25 WELL #54 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 25 WELL #54 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 25 WELL #54 N 0.0000 0.5000 UG/L ll-JAN-95 RJAC OR950470 R 1,1, 1,2-TETRACHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,2,2-TETRACHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2.4-TRIMETHYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2-OICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,3-OICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 25 WELL #54 U 0.0000 5.0000 UG/L E) R BENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R BRONOCHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOOICHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOFORM 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 25 WELL #54 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 25 WELL #54 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 25 WELL #54 U 0.0000 2.5000 UG/L R CHLOROFORM 25 WELL #54 U 0.0000 0.5000 UG/L R CHLOROMETHANE 25 WELL #54 u 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 25 WELL #54 u 0.0000 0.5000 UG/L

001049 October 28, 1997 New Mexico Public Water Supply System Chenlcal Results Page: 3 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC ll-JAN-95 RJAC OR950470 R CIS-1, 3-DICHLOROPROPENE 25 WELL #54 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R ETHYLBENZENE 25 WELL 154 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 25 WELL #54 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 25 WELL #54 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R NAPHTHALENE 25 WELL #54 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R STYRENE 25 WELL #54 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 25 WELL #54 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 25 WELL #54 U 0.0000 5.0000 UG/L R TOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHAHE 25 WELL #54 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 25 WELL #54 U 0.0000 2.0000 UG/L R XYLENES. TOTAL 25 WELL #54 U 0.0000 1.0000 UG/L 24-APR-96 RJAC OR9601484 R 1,1,1.2-TETRACHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1,2-TRICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-OICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L

001050 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: 4 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MM- WITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 24-APR-96 RJAC OR9601484 R 1,2,4-TRICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 2,2-OICHLOROPROPANE 25 WELL #54 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 25 WELL #54 U 0.0000 5.0000 UG/L E) R BENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOFORM 25 WELL #54 U 0.0000 0.5000 UG/L R BROMOMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 25 WELL #54 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 25 WELL #54 U 0.0000 0.5000 UG/L NE) R CHLOROETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R CHLOROFORM 25 WELL #54 U 0.0000 0.5000 UG/L R CHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 25 WELL #54 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 25 WELL #54 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R DICHLOROOIFLUOROMETHANE 25 WELL #54 U 0.0000 0.5000 UG/L R ETHYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 25 WELL #54 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 25 WELL #54 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R NAPHTHALENE 25 WELL #54 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L

001051 October 28, 1997r New Mexico Public Water Supply System Chemical Results Page: 5 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 24-APR-96 RJAC OR9601484 R0-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 25 WELL #54 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R STYRENE 25 WELL #54 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 25 WELL #54 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 25 WELL #54 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 25 WELL #54 U 0.0000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 25 WELL #54 U 0. 0000 5.0000 UG/L R TOLUENE 25 WELL #54 U 0. 0000 0. 5000 UG/L R TRANS-1.2-DICHLOROETHYLENE 25 WELL #54 U 0. 0000 0. 5000 UG/L R TRANS-1,3-DICHLOROPROPENE 25 WELL #54 U 0. 0000 0. 5000 UG/L R TRICHLOROETHYLENE 25 WELL #54 U 0. 0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 25 WELL #54 U 0. 0000 0. 5000 UG/L R VINYL CHLORIDE 25 WELL #54 U 0. 0000 0. 5000 UG/L R XYLENES, TOTAL 25 WELL #54 U 0. 0000 0. 5000 UG/L 157 rows selected.

001052 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-AUG-93 CHEE OR931882 R 1,1,1, 2-TETRACHLOROETHAN26 EWELL 157 N 0.0000 0.5000 UG/L R 1,1, 1-TRICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHAN26 EWELL #57 N 0.0000 0.5000 UG/L R 1, 1,2-TRICHLORDETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1-DICHLORQPROPENE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1 , 2 , 4-TRICHLORQBENZEN26 EWELL #57 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1 , 2-DICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 2, 2-DICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R BENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMOBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMOFORM 26 WELL #57 N 0.0000 0.5000 UG/L R BRONOMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 26 WELL #57 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 26 WELL #57 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 26 WELL #57 N 0. 0000 0.5000 UG/L R CHLOROFORM 26 WELL #57 N 0. 0000 0.5000 UG/L R CHLOROMETHANE 26 WELL #57 N 0. 0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 26 WELL #57 N 0. 0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 26 WELL #57 N 0. 0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 26 WELL #57 N 0. 0000 0. 5000 UG/L R ETHYLBENZENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R M-DICHLOROBENZENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 26 WELL #57 N 0. 0000 0. 5000 UG/L THANE) R 0-CHLOROTOLUENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R 0-DICHLOROBENZENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R P-CHLOROTOLUENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R P-DICHLOROBENZENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R STYRENE 26 WELL #57 N 0. 0000 0. 5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 26 WELL #57 N 0. 0000 5. 0000 UG/L

001053 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 09-AUG-93 CHEE OR931882 RTETRACHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R TOLUENE 26 WELL #57 N 0.0000 0.5000 UG/L R TRANS-1 . 2-0 ICHLOROETHYLEN26 WELL #57 N E 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 26 WELL #57 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 26 WELL #57 N 0.0000 0.5000 UG/L 13-APR-94 RJAC OR941149 R1,1,1, 2-TETRACHLOROETHAN26 EWELL #57 N 0.0000 0.5000 UG/L R 1,1,1-TRICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1,2, 2-TETRACHLOROETHAN26 EWELL #57 N 0.0000 0.5000 UG/L R 1,1, 2-TRICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,1-DICHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R 1 , 1-DICHLOROPROPENE 26 WELL #57 N 0.0000 0.5000 UG/L R 1.2,3-TRICHLORQPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,2-DICHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,2-DICHLORQPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R 2,2-DICHLOROPROPANE 26 WELL #57 N 0.0000 0.5000 UG/L R BENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMOBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R BROMOFORM 26 WELL #57 N 0.0000 0.5000 UG/L R BROMOMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 26 WELL #57 N 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 26 WELL #57 N 0.0000 0.5000 UG/L NE) R CHLOROETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R CHLOROFORM 26 WELL #57 N 0.0000 0.5000 UG/L R CHLOROMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 26 WELL #57 N 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 26 WELL #57 N 0.0000 0.5000 UG/L R ETHYLBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 26 WELL #57 N 0.0000 0.5000 UG/L THANE)

001054 October 28, 1997r New Mexico Public Water Supply System Chemical Results Page: During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/- MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 13-APR-94 RJAC OR941149 R 0-CHLOROTOLUENE 26 WELL #57 N 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 26 WELL #57 N 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 26 WELL #57 N 0.0000 0.5000 UG/L R STYRENE 26 WELL #57 N 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 26 WELL #57 N 0.0000 5.0000 UG/L R TETRACHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R TOLUENE 26 WELL #57 N 0.0000 0.5000 UG/L R TRANS-1 , 2-DICHLOROETHYLEN26 WELE L #57 N 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 26 WELL #57 N 0.0000 0.5000 UG/L R VINYL CHLORIDE 26 WELL #57 N 0.0000 0.5000 UG/L R XYLENES, TOTAL 26 WELL #57 N 0.0000 0.5000 UG/L 19-JAN-95 RJAC OR950546 R 1 . 1 , 1 , 2-TETRACHLOROETHAN26 WELL #57 E U 0.0000 0.5000 UG/L R 1,1, 1-TRICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1 , 1 , 2, 2-TETRACHLOROETHAN26 WELL #57E U 0.0000 0.5000 UG/L R 1,1, 2-TRICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1 , 1-DICHLOROETHYLENE26 WELL #57 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2, 3-TRICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2, 4-TRICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2, 4-TRIMETHYLBENZENE26 WELL #57 U 0.0000 0.5000 UG/L R 1,2-DICHLOROETNANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1 , 2-DICHLOROPROPANE26 WELL #57 U 0.0000 0.5000 UG/L R 1,3, 5-TRIMETHYLBENZENE26 WELL #57 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 2, 2-DICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 26 WELL #57 U 0.0000 5.0000 UG/L E) R BENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOFORM 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 26 WELL #57 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 26 WELL #57 U 0.0000 0.5000 UG/L

001055 October 28, 1997 New Mexico Public Water Supplf y System Chemical Results r Page: 4 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID* COLLECTION POINT NOT RESULT HDL UNITS NE) 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 19-JAN-95 RJAC OR950546 R CHLOROETHANE 26 WELL 157 U 0.0000 2.5000 UG/L R CHLOROFORM 26 WELL #57 U 0.0000 0.5000 UG/L R CHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R C IS- 1 , 2-DICHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 26 WELL #57 U 0.0000 0.5000 UG/L R D I BROMOCHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R DIBROMOMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R DICHLORODIFLUOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R ETHYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R HEXACHLOROBUTADIENE 26 WELL #57 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 26 WELL #57 U 0.0000 0.5000 UG/L THANE) R N-BUTYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R NAPHTHALENE 26 WELL #57 U 0.0000 0.5000 UG/L R 0-CHLOftOTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R STYRENE 26 WELL #57 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 26 WELL #57 U 0.0000 5.0000 UG/L R TERT-BUTYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R TETRACHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R TETRAHYDROFURAN (THF) 26 WELL #57 U 0.0000 5.0000 UG/L R TOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R TRANS-1, 2-DICHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R TRICHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R TRICHLOROFLUOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R VINYL CHLORIDE 26 WELL #57 U 0.0000 2.0000 UG/L R XYLENES, TOTAL 26 WELL #57 U 0.0000 1.0000 UG/L 21-FEB-96 RJAC OR9600795 R1,1,1, 2-TETRACHLOROETHAN26 E WELL #57 U 0.0000 0.5000 UG/L R 1,1, 1-TRICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1 , 1 , 2 , 2-TETRACHLOROETHAN26 WELLE#57 U 0.0000 0.5000 UG/L

001056 October 28, 1997 New Mexico Public Water Supply System Chemical Results Page: 5 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT V MDL UNITS 11707 LAS CRUCES MUNICIPAL WATER SYSTEM LC 21-FEB-96 RJAC OR9600795 R 1,1,2-TRICHLOROETHANE 26 WELL 157 U 0.0000 0.5000 UG/L R 1,1-DICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,1-OICHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,1-DICHLOROPROPENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2,3-TRICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2,4-TRICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2,4-TRIMETHYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2-OICHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,2-DICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,3,5-TRIMETHYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R 1,3-DICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 2,2-OICHLOROPROPANE 26 WELL #57 U 0.0000 0.5000 UG/L R 2-BUTANONE (METHYL ETHYL KETON 26 WELL #57 U 0.0000 5.0000 UG/L E) R BENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R BROM08ENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOCHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMODICHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOFORM 26 WELL #57 U 0.0000 0.5000 UG/L R BROMOMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R CARBON TETRACHLORIDE 26 WELL #57 U 0.0000 0.5000 UG/L R CHLOROBENZENE (MONOCHLOROBENZE 26 WELL #57 U 0.0000 0.5000 UG/L HE) R CHLOROETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R CHLOROFORM 26 WELL #57 U 0.0000 0.5000 UG/L R CHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R CIS-1, 2-DICHLOROETHYLENE 26 WELL #57 U 0.0000 0.5000 UG/L R CIS-1, 3-DICHLOROPROPENE 26 WELL #57 U 0.0000 0.5000 UG/L R DIBROMOCHLOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R D I BROMOMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R DICHLOROD I FLUOROMETHANE 26 WELL #57 U 0.0000 0.5000 UG/L R ETHYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R HEXACHLOROBUTAOIENE 26 WELL #57 U 0.0000 0.5000 UG/L R ISOPROPYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R M-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R METHYLENE CHLORIDE (DICHLOROME 26 WELL #57 U 0.0000 0.5000 UG/L

001057 October 28, 1997 New Mexico Public Water Supply Systen Chemical Results Page: 6 During the Period Beginning Ol-JUL-93 and Ending Ol-JUL-97 INV SYSTEM NAME OF DATE STAF LAB NUMBER S CONTAMINANT ID# COLLECTION POINT NOT RESULT +/- MDL UNITS THANE) 11707 LAS CRUCES MUNICIPAL MATER SYSTEM LC 21-FEB-96 RJAC OR9600795 RN-BUTYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R N-PROPYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R NAPHTHALENE 26 WELL #57 U 0.0000 0.5000 UG/L R 0-CHLOROTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R 0-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-CHLOROTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-DICHLOROBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R P-ISOPROPYLTOLUENE 26 WELL #57 U 0.0000 0.5000 UG/L R SEC-BUTYLBENZENE 26 WELL #57 U 0.0000 0.5000 UG/L R STYRENE 26 WELL #57 U 0.0000 0.5000 UG/L R TERT-BUTYL METHYL ETHER (MTBE) 26 WELL #57 U 0. 0000 5.0000 UG/L R TERT-BUTYLBENZENE 26 WELL #57 U 0. 0000 0. 5000 UG/L R TETRACHLOROETHYLENE 26 WELL #57 U 0. 0000 0. 5000 UG/L R TETRAHYDROFURAN (THF) 26 WELL #57 U 0. 0000 5. 0000 UG/L R TOLUENE 26 WELL #57 U 0. 0000 0. 5000 UG/L R TRANS-1 . 2-D ICHLOROETHYLEN26 WELL #57 UE 0. 0000 0. 5000 UG/L R TRANS-1 ,3-DICHLOROPROPENE 26 WELL #57 U 0. 0000 0. 5000 UG/L R TRICHLOROETHYLENE 26 WELL #57 U 0. 0000 0. 5000 UG/L R TRICHLOROFLUOROMETHANE 26 WELL #57 U 0. 0000 0. 5000 UG/L R VINYL CHLORIDE 26 WELL #57 U 0. 0000 0. 5000 UG/L R XYLENES, TOTAL 26 WELL #57 U 0. 0000 0. 5000 UG/L 198 rows selected.

001058 STREET MAP

SCALE; 1 • 1600r I DATE DRAWN: SEPTEMBER, 1994 BY CLC TECH. SUPPORT / DRAFTING STAFF

001059 I Los Cmces City Limits

I 1996 WATER WELL MAP I

\\ C 001060 _ J

JL

001061 001062 NMED, DWB, WATER SYSTEM SAMPLE POINTS J'-serted: Code...... 11707 Name...LAS_CRUCES_MUNICIPAL_WATER______by _____ Sample Pt ID.2_ Name.. .WELL_#18______Modified: State Engineer Well Numb...______12-MAR-96 by DWB_03 Currently Sampling _ Frequencies (Y)?._ Waivers (Y)?._ Description. .______EPA Marker. . .M Record Type..S Source...G Toponame....LAS_CRUCES__ Availability.P WS Code..____ Well Number.321856106453601 Entry Pt Sample Pt Id....999 Depth...... 576_ Drawdown....103 Latitude..... 321856______Pumpset..... 370_ Drill Date.. 1960 Longitude....1064536_____ Static...... 205_ Elevation...4040_ Location ID..23S02E08344 Pump GPM....800_ ..C2 to Nxt Blk ID Treatment Objective Treatment Process 1_ D Disinfection______401 Gaseous_Chlorination,_Post__

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001063 NMED, DWB, WATER SYSTEM SAMPLE POINTS Code...... 11707 Name...LAS_CRUCES_MUNICIPAL_WATER______by . Sample Pt ID.3_ Name.. .WELL_#19______Modified: State Engineer Well Numb...______12-MAR-96 by DWB_03 Currently Sampling _ Frequencies (Y)?._ Waivers (Y)?._ Description..______EPA Marker.. .M Record Type..S Source...G Toponame....TORTUGAS_MTN. Availability.P WS Code..____ Well Number.321901106445601 Entry Pt Sample Pt Id....999 Depth...... 675_ Drawdown....42_ Latitude.... .321901_____ Pumpset.....300_ Drill Date.. 1962 Longitude....1064456______Static...... 208_ Elevation...____ liobtttion ID. .23S02E09333 Pump GPM....900_ . .C2 to Nxt Blk ID Treatment Objective Treatment Process 1_ D Disinfection______401 Gaseous_Chlorination,_Post__

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001064 NMED, DWB, WATER SYSTEM SAMPLE POINTS Code...... 11707 Name...LAS_CRUCES_MUNICIPAL_WATER______by _____ SamplJ e Pt ID.5_ Name...WELL_f21______Modified: State Engineer Well Numb...______12-MAR-96 by DWB_03 Currently Sampling _ Frequencies (Y)?._ Waivers (Y)?._ Description..______EPA Marker...M Record Type..S Source...G Toponame....LAS_CRUCES__ Availability.? WS Code..____ Well Number.321920106450901 Entry Pt Sample Pt Id....999 Depth...... 632_ Drawdown....70_ Latitude. ....321920______Pumpset.... .350_ Drill Date.. 1962 Longitude....1064509_____ Static...... 250_ Elevation...4070_ Location ID..23S02E08411 Pump GPM....1200 ..C2 to Nxt Blk ID Treatment Objective Treatment Process 1 D Disinfection______401 Gaseous Chlorination, Post__

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001065 NMED, DWB, WATER SYSTEM SAMPLE POINTS J3>vserted: J Code...... 11707 Name. . ,IAS_CRUCES_MUNICIPAL_WATER______by _____ Sample Pt ID.11_ Name.. .WELL_#27______Modified: State Engineer Well Numb...______12-MAR-96 by DWB_03 Currently Sampling _ Frequencies (Y)?._ Waivers (Y)?._ Description..______EPA Marker. . .M Record Type..S Source...G Toponame....LAS_CRUCES__ Availability.? WSCode..____ Well Number.321856106451701 Entry Pt Sample Pt Id....999 Depth...... 730_ Drawdown....88_ Latitude.... .321856______Pumpset.... .380_ Drill Date.. 1971 Longitude....1064517_____ Static...... 227_ Elevation..,4053_ Location ID..23S02E08443 Pump GPM....800_ ..C2 to Nxt Blk ID Treatment Objective Treatment Process 1_ D Disinfection______401 Gaseous_Chlorination,_Post__

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001066 22-141 50 SHEETS 001067 22-142 100 SHEETS 22-144 200 SHEETS 7> (A OO ri\ C^- 0— r\ I r r- -£h r- ^ r P r co P (AP ~o 0 fi 0 J r- ^ r n 1- c r / >• o e, r CA v %. £ ^ P fb ^ rt -t- m 0 (A P cr c_DD -Co cr c 5 ^ CA ft- r»e- HYDROLOGIC REPORT 1 Geology and Ground-Water Resources Western Dona Ana by W. E. KING J. W. HAWLEY A. M. TAYLOR R. P. WILSON WATER RESOURCES RESEARCH INSTITUTE, in cooperation 'with NEW MEXICO STATE BUREAU OF MINES AND MINERAL RESOURCES

NEW MEXICO DEPARTMENT OF HEALTH AND ENVIRONMENT ENVIRONMENTAL IMPROVEMENT DIVISION VKATER POLLUTION CONTROL P. 0. BOX 968 SANTA FE, NEW MEXICO 87503 STATE BUREAU OF MINES AND MINERAL RESOURCES NEW MEXICO INSTITUTE Or MINING AND TECHNOLOGY CAMPUS STATION S O C O R R C, N S V, M E x j C O 13

001068 Contents Page ABSTRACT INTRODUCTION ...... 2 Purpose and scope of the investigation ...... 2 Location and general geographic features ...... 2 Population, industry and resources ...... 4 Climate ...... 4 Precipitation ...... 4 Temperature ...... 5 Wind ...... 5 Humidity and evaporation ...... 5 Review of Previous Investigations ...... 5 Acknowledgments ...... 7 System of Numbering Wells in New Mexico ...... 7 GEOLOGY AND ITS RELATION TO THE HYDROLOGIC SYSTEM ...... 9 Geomorphic features ...... 9 Mountains ...... 9 Basins ...... 9 Valley of the Rio Grande ...... 1 1 Soils ...... 12 ROCKS AND UNCONSOLIDATED DEPOSITS: STRATIGRAPHY, LITHOLOGY AND WATER-BEARING CHARACTERISTICS ...... 13 Consolidated Rocks ...... 13 Igneous intrusive and metamorphic rocks ...... 13 Sedimentary rocks of Paleozoic to early Tertiary age ...... 13 Tertiary volcanic and sedimentary rocks ...... 13 Discussion ...... 16 Unconsolidated to moderately consolidated deposits ...... 16 Basin fill— The Santa Fe Group and the Gila Conglomerate ...... 16 The Santa Fe Group in the Palomas Basin ...... ;...... 17 The Santa Fe Group in the Southern Jornada del Muerto Basin and Selden Canyon ...... 17 The Santa Fe Group in the Mesilla Bolson ...... 20 The West Potrillo Mountains and Quaternary Volcanism in the Mesilla Area ...... 22 Rio Grande valley fill deposits ...... 23

001069 !»!||JSSe;i|!!Sip!§p^ "•-•' ••• ••-•••• ••-• ••• - •

Page GEOHYDROLOGY ...... 55 Surface water ...... 55 The ground-water reservoir ...... 55 Ground-water occurrence ...... 57 Recharge and discharge ...... 57 Chemical quality of ground water ...... 57 Ground-water conditions in the southwestern Palomas Basin ...... 57 Ground-water conditions in the Rincon Valley— Selden Canyon area ...... 58 Ground-water conditions in the southern Jomada del Muerto ...... 58 Ground-water conditions in the Mesilla Bolson east of the Mesilla Valley ...... 59 Ground-water conditions in the Mesilla Valley of the Mesilla Bolson ...... 59 Ground-water conditions in the La Mesa portion of the Mesilla Bolson ...... 59 Mountains and basins west of the Mesilla Bolson ...... 59 CONCLUSIONS ...... 60 RECOMMENDATIONS FOR FURTHER STUDIES ...... 60 RECOMMENDATIONS TO WELL DRILLERS AND CONSUMERS ...... 60 REFERENCES ...... 61

001070 NEW MEXICO STATE BUREAU OF MINES AND MINERAL RESOURCES East of the Rio Grande valley in the southern Jornada del Chamberino, the Apollo Test Facility of NASA in the Muerto, the area is likewise primarily grazing land. The U.S. Jornada del Muerto, and the Hanes Corporation knitting mill Department of Agriculture maintains the Jornada Range Sta- south of Las Cruces. tion in the area, and New Mexico State University operates Finally, there are sporadic mining endeavors in the region. a ranch near the Dona Ana Mountains. There is some ir- Should certain mineral prices improve at any time, mining rigated fanning near the center of the Jornada basin (sec. 36, activity could expand rapidly. T. 20 S., R. 2 E.), where wells yield fairly large quantities of Despite the modest industrial development of the area, the water. However, the irrigated areas comprise only small parts potential for growth appears to be very bright as the popula- of this vast region. In the same general area of the Jornada tion pressures of the nation become more intense. The water del Muerto (sees. 30, 31, T. 20 S., R. 2 E.), the two water- resources, particularly those of the Rio Grande valley, are ade- supply wells for the Apollo Test Facility of the National quate to support many kinds of industry. With sufficient Aeronautics and Space Administration provide adequate water, an extremely favorable climate, and an inviting labor quantities of water. market, the region is destined to continue to be one of the Along U. S. Highway 70 in the southern Jornada del major growth areas of New Mexico and the Southwest. Muerto, several housing subdivisions rely upon ground water, and many small business establishments, such as gasoline sta- tions, grocery stores, and automotive repair garages, have CLIMATE* wells. It seems likely that the strip of land bordering U.S. At present two general kinds of climate prevail in the study Highway 70 will be a developing commercial area of the area. The climate is arid (Thomthwaite, 1948) in hoia areas future, but it is unlikely that there will be much irrigation along both sides of die Rio Grande valley, in the valley ittelf, farming, as explained elsewhere in this report. and in the dosed basin north of U.S. Highway 70. The Prominent features of the southern Jornada del Muerto are climates of the highest mountains, the Organs and San An- the Dona Ana Mountains, the Tonuco-Selden Hills uplift, dres, are considered to be semiarid. The Dona Ana and and, along the eastern boundary, the San Andres and Organ Robledo Mountains are ranges of lower elevation and may Mountains. The summit of Organ Needle, with an elevation be arid in part. The climatological data in Tables i, 2, and of 9,012 feet, is the highest point in Dona Ana County. 3 were compiled from U.S. Weather Bureau Climatological South of the Jornada del Muerto, or south of a line from Summaries (1932, 1965, 1962-1967) and from Hardy, Over- the central Dona Ana Mountains to Tortugas Mountain to peck, and Wilson (1939). the central Organ Mountains, a portion of the Mesilla Bolson lies east of the Rio Grande valley. Prominent features of the PRECIPITATION area are the Tortugas Mountain and Bishop Cap uplifts. The Precipitation patterns in the study area are controlled region is bordered on the east by the southern Organ Moun- mainly by the inLfcd location and by the north-south orien- tation of the mountain ranges. In summer, moist air from the tains and the northern Franklin Mountains. Although there Gulf of Mexico dominates the region. Surface heating and is a small fanning development in Fillmore Pass between the lifting of the moist Gulf air as it moves upslope causes thun- Franklin Mountains and Bishop Cap, this region is primarily dershowers that are usually short but commonly intense. In utilized for livestock production. the winter, general eastward circulation of moist air from the Pacific Ocean is dominant. Nearly all of the precipitation POPULATION, INDUSTRY, AND falls in the form of rain. Some light snow falls on the aver- RESOURCES age of two years out of three, but it usually melts as soon as Las Graces is the dominant population center of the area, it accumulates on the ground. Prolonged rains are un- with an estimated population of 47,000 (based upon utilities- common. ^^' ^ Most of the other poulation centers are con- The average annual precipitation in the valley at Univer- lied in the Rio Grande valley. From north to south, sity Park is slightly more than 8 inches. This value is similar the more prominent are Arrey, Derry, Garfield, to those of Fort Fillmore, just south of University Park, and iron, Hatch, Radium Springs, Dofia Ana, Mesilla, Fort Selden to the north, as shown in Table i. In the closed- San Miguel, La Mesa, Vado, Berino, Anthony, La basin area north of U.S. Highway 70 in the southern Jornada 1 Anapra. The community at New Mexico State del Muerto, precipitation is nearly 9 inches, according to in University Park has 7,350 students, 3,000 of Jornada Experimental Range records. More than half the Tats, residents. The university operates its own water moisture normally falls during July, August, and September. D. The only population center of any appreciable size The yearly precipitation varies widely. The highest recorded outside of the Rk> Grande valley is Organ, which lies in San annual precipitation at University Park was 19.60 inches in Augustin Pass of the Organ Mountains (sometimes called 1941, and the lowest was 3.62 inches in 1964. A 6.49-inch the San Augustin Mountains in that area). rain that fell in a 24-hour period on August 29-30, 1935, was ••; All population centers mentioned above are dependent up- one of the heaviest 24-hour rainfalls recorded in New on ground-water supply for domestic and industrial purposes. Mexico. Although the area is not heavily industrialized, ground- Precipitation increases markedly toward the Organ Moun- water is used for a variety of commercial uses, such as several * Summarized from a statement on the climate of the Las Cruces canneries for the processing of locally grown produce, a newly area prepared by Leland H. Gile, soil scientist, U.S. Soil Conservation constructed, completely automated egg-production plant near Service.

001071 GROUND-WATER RESOURCES OF DONA ANA COUNTY tains, which are the highest mountains in the area. There is is more than ten times the average precipitation at Univer- official weather station there, but unofficial records were sity Park. Evaporation is greatest during late spring and sum- rained from Boyd's Ranch at an elevation of 6,200 feet mer. In the mountains, humidity is undoubtedly somewhat (personal communication, R. £. Boyd) in the Organ Moun- higher and evaporation lower than in the desert. tains. Precipitation over the lo-year period from 1948 to 1957 for Boyd's Ranch and University Park are summarized in PREVIOUS INVESTIGATIONS Table 2. Precipitation in the mountains is nearly double that Schlicter (1905) conducted the first ground-water investiga- in the valley. Maximum precipitation occurs in the summer tion in the region. Of particular interest to the present study in both the mountains and the valley. Both stations show a is the fact that he determined the thickness of alluvium over- slight secondary maximum in the winter. lying bedrock in the El Paso narrows to be about 86 feet. In addition, his report contains geologic and hydrologic data TEMPERATURE from a number of auger-hole tests in the vicinity of Mesilla Summer temperatures in the desert are warm (table 3). Park and pumping tests of 12 irrigation wells in the Las Daytime readings reach 90° F or higher during an average of Graces and Berino areas. , ; >* V 101 days a year. Winters are mild. The averag0 e daily min- Lee (1907) presented data on wells and discussed die quanf - imum in January (the'coolest month) is'2j F; the average tity, source, and discharge of ground water in the Mesilla daily maximum is 57°F. The lowest recorded temperature Valley. was —io°F, on January n, 1962. The average annual tem- In 1935, Dunham published a report on the geology of the perature at University Park is 6o°F, and the daily tempera- Organ Mountains and the general geology of Dona Ana ture range generally exceeds 3o°F. The desert areas normally County. He recognized that the bulk of the basin fill was receive more than 80 percent of the possible sunshine. correlative with the Santa Fe formation of northern and cen- WIND tral New Mexico. Dust storms are most common during the spring months. Theis (1936) made a reconnaissance survey of the area Winds are highest during March and April, when they aver- surrounding Las Graces for municipal water supplies. age 7.3 and 7.6 mph respectively, as compared to a yearly In 1938, Bryan discussed the general hydrogeology of the average of 5.9 mph. Rio Grande depression in Colorado, New Mexico, and West Hourly wind speeds during the dusty season show far Texas. He devoted considerable attention to hydrogeologic xreater contrast than the monthly averages. Windiest periods description of types of intermontane basins. Bryan empha- .cur in the afternoons. In March, for example, winds at the sized the following points: El Paso Airport station at 2:00 p.m. were 25 mph or greater 1. Most of the sediments in the Jomada and La Mesa Bolsons for 15 percent of the time, as compared to only i percent for are part of the Santa Fe formation. August and September at the same time of day. High winds 2. The Santa Fe contains sediments laid down in three en- and the dry spring season combine to cause an abundance of vironments of deposition and in two types of basins. blowing dust. Wind direction is variable during the year, Closed basins are characterized by peripheral alluvial-fan but in the spring it is dominantly from the west. deposits grading from bordering mountains toward cen- tral basin floors where fine-grained lake and playa de- HUMIDITY AND EVAPORATION posits occur. Open-ended basins are characterized by Humidities in the desert are low. At University Park, the coarse axial stream (fluvial) deposits flanked by, and in- average is somewhat less than 50 percent for the year and tertonguing with, alluvial-fan deposits derived from ranges from about 60 percent in the early morning to less bordering mountain uplifts. than 30 percent during warmer hours of spring and early 3. An ancestral upper Rio Grande emptied into the Mesilla summer. Evaporation from a free-water surface, as recorded Bolson prior to development of the present through- in an evaporation pan, averages about 97 inches a year, which flowing river system. TABLE 1. AVERAGE MONTHLY AND ANNUAL PRECIPITATION (IN INCHES) AT SEVERAL STATIONS IN THE PROJECT AREA Station, Yean, and Elevation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann. Ft Fillmote 0.07 0.49 0.17 0.11 0.16 0.45 1.80 1.60 1.48 0.54 0.71 0.10 7.68 (1852-1860) 3,880 FtSeHen 0.30 0.22 0.18 0.13 0.18 0.59 1.99 1.91 1.32 0.54 0.25 0.54 8.15 (1866-1876) 3,980 University Park 0.36 0.41 0.36 0.21 0.30 0.59 1.47 1.70 1.2 0.71 0.44 0.49 8.24 (1892-1966) -^ 3,881 jrnada Exp. 0.46 0.37 0.33 0.20 0.38 0.49 1.75 1.68 1.45 0.91 0.40 0.57 8.99 Range (1914- 1966) 4,265

001072 Date: 09/29/97 SUPERFUND CHEMICAL DATA MATRIX SCDH Version: JUN96 Chemical: TetrachLoroethylene CAS Number: 000127-18-4

TOXICITY PHYSICAL CHARACTERISTICS Parameter Value Unit Source Parameter Value Oral RfD: 1.0E-02 mg/kg/day IRIS Metal Contain: Inhal RfD: mg/kg/day Organic: Oral Slope: 5.2E-02 (mg/kg/day)-- 1 LIVECHEM Inorganic: Oral Ut-of-Evid: B2 LIVECHEM Gas: Inhal Slope: (mg/kg/day) *-1 Particulate: Inhal Ut-of-Evid: Radionuclide: Oral ED10: 3.4E+00 mg/kg/day EPA ED 10 Rad. Element: Oral ED10 Ugt: B2 EPA ED 10 Molecular Weight: Inhal ED10: 3.4E+00 mg/kg/day EPA ED 10 Density: Inhal ED10 Ugt: B2 EPA~ED10 Oral LD50: 2.6E+03 mg/kg C EENV Dermal LD50: 3.2E+03 mg/kg RTECS Gas Inhal LC50: 6.0E+03 ppm ACGIH MOBILITY Dust Inhal LC50: 3.4E+01 mg/L RTECS ACUTE Parameter Value Unit Source Fresh AUQC: M/L Salt AUQC: tig/ 1 Vapor Press: 1.9E+01 Torr CHEMFATE Fresh AALAC: WI/L Henry's Law: 1.8E-02 atm-m3/mol CHEMFATE Salt AALAC: M/L Water Solub: 2.0E+02 mg/L LIVECHEM Distrib Coef: 3.1E-01 ml/g SSG KD CHRONIC Geo. Mean Sol.: Fresh AUQC: jtg/L Salt AUQC: fig/L Fresh AALAC: WI/L ^-Salt AALAC: *ig/L . jsh Eco I LC50: 1.6E+03 AQUIRE BIOACCUMULATION Salt Ecol LC50: 2.9E+04 jtg/^g/LL AQUIRE Parameter Value Uni t Source PERSISTENCE FOOD CHAIN Fresh BCF: 4.9E+01 VER BCF Salt BCF: Parameter Value Unit Source ENVIRONMENTAL Fresh BCF: 4.9E+01 VER BCF LAKE - Half lives Salt BCF: Hydrolysis: 3.6E+11 days FATE Volatility: 1.1E+02 days THOMAS Log Kow: 2.7E+00 RTIJ.OGP Photolysis: days Water Solub: 2.0E+02 mg/L LIVECHEM Biodeg: 3.6E+02 days FATERATE Radio: days OTHER DATA RIVER - Half lives Hydrolysis: 3.6E+11 days FATE Melting Point :-22.30° C Volatility: 1.2E+00 days THOMAS Boiling Point :121.30° C Photolysis: days Formula :C2 C14 Biodeg: 3.6E+02 days FATERATE Radio: days Log Kow: 2.7E+00 RTI LOGP CLASS INFORMATION Class Parent Substance Toxicity: NA GU Mob: NA Other: NA

A-721

001073 Date: 09/29/97 SUPERFUND CHEMICAL DATA MATRIX SCOM Version: JUN96 Chemical: Tetrachloroethylene CAS Number: 000127-18-4

1 ASSIGNEDFACTOR VALUES

AIR PATHWAY I I GROUND WATER PATHWAY I SOIL EXPOSURE PATHWAY I Parameter Value Parameter Value Parameter Value Toxicity: 100 Toxicity: 100 Toxicity: 100 Gas Mobility: 1.0000 Water SoLub: 2.0E+02 Gas Migration: 17 Distrib: 3.1E-01 I SURFACE WATER PATHWAY

[Jrinking Water I I Human Food Chain I Environmental I Parameter Value Parameter Value Parameter Value Toxicity: 100 Toxicity: 100 Fresh Tox: 100 Salt Tox: 10 Persistence Persistence Persistence River: 0.4000 River: 0.4000 River: 0.4000 Lake: 1.0000 Lake: 1.0000 Lake: 1.0000 BioaccumuLation BioaccumuLation Fresh: 50.0 Fresh: 50.0 ^ Salt: 50.0 mmmmmmmHmmmmmmmSalt: 50.0 mmm 1 BENCHMARKS

I AIR PATHWAY I GROUND WATER PATHWAY I SOIL EXPOSUR E PATHWAY I I RADIONUCLIDE Parameter Value Unit Parameter Value Unit Parameter Value Unit Parameter Value UniI t NAAQS/NESHAPS: jig/m3 MCL/MCLG: 5.0E-03 mg/L Cancer Risk: 1.2E+01 ing/ kg MCL: pCi/L Cancer Risk: mg/m3 Cancer Risk: 1.6E-03mg/L Non Cancer Risk: 7.8E+02 mg/kg UMTRCA: pCi/kg Non Cancer Risk: mg/m3 Non Cancer Risk: 3.7E-01 mg/L CANCER RISK Air: pCi/m3 DW: pCi/L FC: PCi/kg Soil Ing: pCi/kg Soil Gam: pCi/kg I SURFACE WATER PATHWAY I Drinking Water I I Human Food Chain I I Environmental I Parameter Value Unit Parameter Value Unit Parameter Value Unit MCL/MCLG: 5.0E-03 mg/L FDAAL: ppm ACUTE Cancer Risk: 1.6E-03 mg/L Cancer Risk : 6.1E-02 mg/kg Fresh AWQC: jig/L Non Cancer Risk: 3.7E-01 mg/L Non Cancer Risk: 1.4E+01 mg/kg Salt AWQC: iig/L Fresh AALAC: fig/L Salt AALAC: lig/L •""s CHRONIC Fresh AWQC: pg/L Salt AWQC: jig/L Fresh AALAC: jig/L Salt AALAC: tig/I A-722

001074 HANDBOOK OF DATENVIRONMENTAA ON ORGANILC CHEMICALS Karel Verschueren Environmental Advisor

! VANEWN YORNOSTRANK CINCINNATD I ATLANTREINHOLA DALLAD S COMPANSAN FRANCISCY O I LONDON TORONTO MELBOURNE

001075 CONTENTS Van Nostrand Reinhold Company Regional Offices: I INTRODUCTION 1 New York Cincinnati Atlanta Dallas San Francisco * Van Nostrand Reinhold Company International Offices: D ARRANGEMENT OF CATEGORIES 2 London Toronto Melbourne A. Properties 2 Copyright © 1977 by Litton Educational Publishing, Inc. B. Air pollution factors 2 Library of Congress Catalog Card Number: 77-9401 C. Water pollution factors 2 ISBN: 0-442-29091-8 D. Biological effects 2 All rights reserved. No part of this work covered by the copyright hereon may be reproduced or used in any form or by any means-graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage m ARRANGEMENT OF CHEMICALS 3 and retrieval systems-without permission of the publisher. IV EXPLANATORY NOTES 3 Manufactured in the United States of America A. Properties 4 Published by Van Nostrand Reinhold Company 1. Vapor pressure S 135 West 50th Street, New York, N.Y. 10020 2. Vapor density 5 Published simultaneously in Canada by Van Nostrand Reinhold Ltd. 3. Heat of combustion S 4. Solubility 6 15 14 13 12 11 10 9 8 7 6 5 4 3 2 B. Air Pollution Factors 7 1. Conversion between volume and mass units of concentration 7 2. Threshold limit values for employees' exposure (T. L. V.) 11 Library of Congress Cataloging in Publication Data 3. Protection measures 11 Verschueren, Karel. 4. Odor 12 Handbook of environmental data on organic chemicals. 5. Atmospheric reactions 28 Includes index. 6. Natural sources 28 1. Organic compounds-Environmental aspects. 7. Man-made sources 29 I. Title. 8. Maximum immisrion concentration (MIC) 29 TD196.073V47 363.6 77-9401 ISBN 0-442-29091-8 9. Emission limits 30

\ •" 001076 580 1.2,2.2-TETRACHLOROETHANE 1,1,2,2-TETRACHLOROETHYLENE 681 B. AIR POLLUTION FACTORS: 1 mg/cu m = 0.14 ppm; 1 ppm = 6.98 mg/cu m from industrial boilers; mfg. paint removers, printing inks; mfg. trichloroace- -T.L.V.: USSR: 0.7 ppm = 5 mg/cu m 1972 (240) tic acid; vermifuge; heat transfer medium; mfg. of fiuorocarbons. (347) USA: 5 ppm = 35 mg/cu m 1974 (77) BRD: lppm= 7 mg/cu m 1974 (241) A. PROPERTIES: colorless liquid; m.w. 165.83; m.p. -22.7°C; b.p. 121.4°C; DDR: 10 mg/cu m 1973 (237) v.p. 14 mm at 20°C, 24 mm at 30°C, 45 mm at 40°C; v.d. 5.83; sp.gr. -Protection measures: recommended VDC: 5 ppm; dilution rate: 480,000 1.626 at 20°C; solub. 150 mg/1 at 25°C; sat. cone. 126 g/cu m at 20°C, cu ft air/lb solvent flow. If 10 ppm exceeded:, toxic (116) 210g/cumat30°C -Odor: T.O.C. <3 ppm (211) B. AIR POLLUTION FACTORS: 1 mg/cu m = 0.15 ppm; 1 ppm = 6.89 mg/cu m -Emission limits: M.E.C. = 20 mg/cu m if emission >0.1 kg/hr BRD 1974 -T.L.V.: (178) USSR: 1.5ppm= 10 mg/cu m 1972 (240) -Sampling and analysis: photometry: min. full scale: 5,000 ppm (53) USA: 100 ppm = 670 mg/cu m; ACC = 200 ppm; AMP = 300 ppm 5 C. WATER POLLUTION FACTORS: mininany3hr 1974 (77) -Reduction of amenities: BRD: 100 ppm = 670 mg/cu m skin 1974 (202) odor threshold: 5 mg/1 (84) DDR: 300 mg/cu m 1973 (237) organoleptic limit USSR 1970: 0.2 mg/1 (n.s.i.) (181) Sweden: 200 mg/cu m 1975 (238) T.O.C. in water: 0.5 ppm (326) CSSR: 250 mg/cu m 1969 (239) -Waste water treatment: evaporation from water at 25°C of 1 ppm solution: -Protection measures: recommended VDC= 100 ppm;dilution rate: 24,000 50% after 56 min cu ft air/lb solvent flow. If 200 ppm exceeded: disagreeable, toxic (116) 90% after less than 120 min (313) -Odor: characteristic: etheric, chlorinated solvent: recogn.: 34.6-320 -Sampling and analysis: mg/cu m (73) GC-EC after n-pentane extraction: det.lim.: 0.01//g/1 (84) T.O.C.: 50 ppm (298) D. BIOLOGICAL EFFECTS: distinct odor: 480 mg/cu m (278) -Mammalia: PITso% recogn.: 4.68 ppm cats and rabbits: inhalation: no typical organ change: 100-160 ppm, PITioo% recogn.: 4.68 ppm (2) 8 hr/d, 4 weeks O.I.at20°C: 370 ( i ) dog: oral, dose: toxic: 0.7g/kg -M-l-C. M.I.C.S M.I.C.L 3 6 lethal: 0.3 ml/kg (211) mg/cu m ppm avg. time mg/cu m ppm avg. time -Man: severe toxic effects: 50 ppm - 350 mg/cu m, 60 min BRD symptoms of illness: 20 ppm =140 mg/cu m, (VDI2306) 110 15 30min 35 5 30min unsatisfactory: >10ppm= 70 mg/cu m, (n.s.i.) (185) -Manmade sources: 1,2,2,2-tttrachlororthwM glc's in rural Washington Dec 1974-Feb 1975: 20 ppt (315) CHjClCClj glc's in Los Angeles county: 0.01-4.2 ppb (46) C. WATER POLLUTION FACTORS: -Emission limits: M.E.C. = 150 mg/cu m if emission >3 kg/hr BRD 1974 -Waste water treatment: evaporation from water at 25°C of 1 ppm solution (178) 50% after 43 min -Sampling and analysis: photometry: min. full scale: 270 ppm (53) 90% after more than 120 min (313) C. WATER POLLUTION FACTORS: 1,1,2,2-t«tracMor72 days for com- coefficient (n. octane) = 2.88 (193) plete disappearance (175) -Mammalia: -Reduction of amenities: T.O.C.: 0.915-47.0 mg/1 (226) rats: inhalation: no patholog. effects: 70 ppm, 8 hr/day, 5 days/w, 7 D. BIOLOGICAL EFFECTS: months -Mammalia: rats: acute oral LD50: 0.14 g/kg (211) : some patholog. changes in liver and kidneys 230 ppm, 8 tetrachloropropane hr/day, 5 days/w, 7 months (211) A. PROPERTIES: m.w. 181.88; v.d. 6.28 3,4,5,6-tatracMoroguaiacol C. WATER POLLUTION FACTORS: D. BIOLOGICAL EFFECTS: -Reduction of amenities: organoleptic limit: 0.01 mg/1 (n.s.i.) (181) -Fishes: juvenile rainbow trout: LC (96 hr): 0.32 mg/1 (314) -Waste water treatment: evaporation from water at 25°C of 1 ppm solution: 50 l,2,3,3'-isomer: 50%after 50 min MtrachtorotoptMM 90% after more than 120 min B. AIR POLLUTION FACTORS: 1 mg/cu m « 0.10 ppm; 1 ppm = 9.89 mg/cu m 1,2,2',3-isomer: 50% after 47 min -T.L.V.: USSR: 0.1 ppm= 1 mg/cu m 1971 (57) 90% after more than 120 min (313) C. WATER POLLUTION FACTORS: -Reduction of amenities: organoleptic limit: 0.0025 mg/1 (n.s.i.) (181) tetrachloroundecam A. PROPERTIES: m.w. 294.09; v.d. 10.2 tttracMoronwthww see carbontetrachloride B. AIR POLLUTION FACTORS: 1 mg/cu m = 0.08 ppm; 1 ppm = 12.2 mg/cu m 1,2,3,4-MtrachlorofMphthatone (naphthalenetetrachloride) -T.L.V.: USSR: 0.4 ppm = 5 mg/cu m 1967 (187) A. PROPERTIES: crystals; m.w. 269.99; m.p. 182°C;v.d. 9.19 C. WATER POLLUTION FACTORS: B. AIR POLLUTION FACTORS: 1 mg/cu m » 0.09 ppm; 1 ppm= 11.1 mg/cu m -Reduction of amenities: organoleptic limit: 0.007 mg/1 (n.sJ.) (181) -T.L.V.: USSR: 1 mg/cu m (n.s.i.) 1971 (57) USA: 2 mg/cu m (n.sJ.) skin 1974 (77) n-tetradMam CH3(CH2)uCH3 UlWCfnOTOflOfMfM ' c— A. PROPERTIES: colorless liquid; m.w. 198.38;m.p. 5°C;b.p. 252°C; v.p. 1 mm A. PROPERTIES: m.w. 266.04; v.d. 9.19 at 76°C; v.d. 6.83; solub. in sea water: 0.0017 mg/1 at 25°C, in distilled B. AIR POLLUTION FACTORS: 1 mg/cu m = 0.09 ppm; 1 ppm =11.1 mg/cu m water: 0.0022 mg/1 at 25°C -T.L.V.: USSR: 0.09 ppm = 1 mg/cu m 1971 (57) C. WATER POLLUTION FACTORS: C. WATER POLLUTION FACTORS: -Manmade sources: percolation water at 30-500 m from dumping ground -Reduction of amenities: organoleptic limit: 0.003 mg/1 (n.s.i.) (181) contained 30 ppb (183) iBliicfiloropantMM -Waste water treatment methods: A.S. after 6hr: 1.5%ofThOD A. PROPERTIES: m.w. 209.93; v.d. 7.25 12hr: 3.4%ofThOD B. AIR POLLUTION FACTORS: 1 mg/cu m = 0.12 ppm; 1 ppm = 8.73 mg/cu m 24 hr: 6.4%ofThOD (88) -T.L.V.: USSR: 0.1 ppm = 1 mg/cu m 1971 (57) tetradecanoic add see myristic acid C 001078 NEW MEXICO ENVIRONMENT DEPT. DNAPL LIBRARY Site Evaluation

Robert M. Cohen James W. Mercer GeoTrans, Inc. 46050 Manekin Plaza, Suite 100 Sterling, Virginia 21066 k•^f •* JohEPAn ProjectMatthew Officer s f I Robert S. Kerr Environmental Research Laboratory Office of Research and Development ,. U.S. Environmental Protection Agency V* Ada, Oklahoma 74820

C. K SMOLEY

001079 NOTICE

The information in this document has been funded wholly or in part by the United States Environmental Protection Agency under contract 68-C8-0058 to Dynamac Corporation. This report has been subjected to the Agency's peer and administrative review and has been approved for publication as an EPA document. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. All research projects making conclusions or recommendations based on environmentally related measurements and funded by the Environmental Protection Agency are required to participate in the Agency Quality Assurance Program. This project did not involve environmentally related measurements and did not involve a Quality Assurance Project Plan.

Library of Congress Cataloging-in-Publication Data Catalog record is available from the Library of Congress. ISBN 0-87371-977-8 © 1993 by C. K. SMOLEY Direct all inquiries to CRC Press, Inc., 2000 Corporate Blvd., N.W. Boca Raton, Florida 33431. PRINTED IN THE UNITED STATES OF AMERICA 234567890 Printed on acid-free paper

001080 IV CONTENTS

Disclaimer ...... ii Foreword ...... iii List of Tables ...... ix List of Figures...... —...—...... xiii Acknowledgements...... xxii Chapter 1 Executive Summary ...... 1-1 Chapter 2 Introduction ...... 2-1 2.1 Manual Objectives...... 2-1 2.2 Derivation of Manual...... 2-3 2.3 DNAPL Site Investigation Issues...... 2-3 2.4 DNAPL Site Investigation Practice...... 2-5 2.5 Manual Organization ...... 2-5 Chapter 3 Scope of Problem...... 3-1 3.1 Introduction ...... 3-1 3.2 Halogenated Solvents...... 3-1 3.3 Coal Tar and Creosote ...... 3-9 3.4 Polychlorinated Biphenyls (PCBs) ...... 3-13 3.5 Miscellaneous and Mixed DNAPL Sites...... 3-19 Chapter 4 Properties of Fluid and Media...... 4-1 4.1 Saturation ...... 4-1 4.2 Interfacial Tension...... 4-1 4.3 Wettability...... 4-3 4.4 Capillary Pressure ...... 4-6 4.5 Residual Saturation ...... 4-16 4.6 Relative Permeability...... 4-24 4.7 Solubility ...... 4-26 4.8 Volatilization ...... 4-28 4.9 Density ...... 4-29 4.10 Viscosity...... 4-29 Chapter 5 DNAPL Transport: Processes, Conceptual Models, and Assessment...... 5-1 5.1 Overview of DNAPL Migration Processes ...... 5-1 5.1.1 Gravity, Capillary Pressure, and Hydrodynamic Forces ...... 5-1 5.1.2 DNAPL Migration Patterns...... 5-5 5.1.2.1 DNAPL in the Vadose Zone ...... 5-5 5.1.2.2 DNAPL in the Saturated Zone...... 5-7 5.2 Conceptual Models ...... 5-8 5.3 Hypothesis Testing Using Quantitative Methods...... 5-8 5.3.1 How much DNAPL is required to sink through the vadose zone?...... 5-12 5.3.2 How long will it take DNAPL released at or near the ground surface to sink to the water table?...... 5-13

001081 CONTENTS 5.3.3 What thickness DNAPL must accumulate on the capillary fringe to cause DNAPL to enter the saturated zone?...... 5-13 5.3.4 Will a finer-grained layer beneath the contamination zone act as a capillary barrier to continued downward migration of DNAPL? What minimum DNAPL column or body height is required to enter a particular capillary barrier beneath the water table?...... 5-16 5.3.5 If DNAPL is perched above a finer-grained capillary barrier layer, what size fracture or macropore will permit continued downward migration into (or through) the capillary barrier? ...... 5-16 5.3.6 What saturation must be attained at the base of a host medium for DNAPL to enter an underlying finer-grained capillary barrier?...... 5-16 5.3.7 What upward hydraulic gradient will be required to prevent continued downward migration of DNAPL? ...... 5-20 5.3.8 What upslope hydraulic gradient will be required to prevent continued downslope movement of DNAPL along the base of a dipping fracture or the base of a coarser layer underlain by adipping finer layer?...... 5-24 5.3.9 What will be the stable DNAPL pool length that can exist above a sloping capillary barrier or sloping fracture below the water table? ...... 5-24 5.3.10 What will be the stable DNAPL height and area after spreading above an impenetrable flat-lying capillary barrier?...... 5-24 5.3.11 What is the volume of DNAPL contained below the water table within porous or fractured media? ...... 5-24 5.3.12 How do fluid viscosity and density affect the velocity and distance of DNAPL migration? ...... 5-27 5.3.13 What hydraulic gradient will be required to initiate the lateral movement of a DNAPL pool or globule? ...... 5-27 5.3.14 How long does DNAPL in the saturated zone take to dissolve completely? ...... 5-32 5.3.15 Given a DNAPL source of dissolved groundwater contamination, how do you determine the movement of a dissolved plume? ...... 5-32 5.3.16 Given a DNAPL source of vapor contamination in the vadose zone, how do you determine the movement of the vapor plume?...... 5-34 5.3.17 What will be the composition of a dissolved plume associated with a DNAPL source?...... 5-34 5.3.18 What is the equivalent mass/volume of DNAPL contained within a dissolved groundwater plume? ...... 5-36 5.3.19 What is the relationship between concentrations in soil gas and groundwater?...... 5-40 5.3.20 Given a DNAPL source in the vadose zone, how can you evaluate the movement 111lib"- of a vapor plume? What are die conditions that favor vapor transport away from a DNAPL source in the vadose zone that would allow soil-gas monitoring?...... 5-40 5.4 Numerical simulation of Immiscible Fluid Flow...... 5-44 5.4.1 Mass Balance Equations ...... 5-46 5.4.2 Immiscible Flow Equations...... 5-46 5.4.3 Compositional Equations ...... 5-46 5.4.4 Constitutive Relations ...... 5-47 5.4.5 Model Utility ...... 5-47

001082 VI CONTENTS Chapter 6 DNAPL Site Characterization Objectives/Strategies...... 6-1 6.1 Difficulties and Concerns ...... 6-1 6.2 Objectives and Strategies...... 6-3 6.2.1 Regulatory Framework ...... 6-3 6.2.2 Source Characterization...... 6-4 6.2.3 Mobile DNAPL Delineation ...... 6-4 6.2.4 Nature and Extent of Contamination ...... 6-4 6.2.5 Risk Assessment...... 6-5 6.2.6 Remedy Assessment...... 6-5 Chapter 7 DNAPL Site Identification and Investigation Implications...... 7-1 7.1 Historical Site Use...... 7-1 7.2 Site Characterization Data...... 7-1 7.2.1 Visual Determination of DNAPL Presence ...... 7-1 7.2.2 Inferring DNAPL Presence Based on Chemical Analyses...... 7-1 7.2.3 Suspecting DNAPL Presence Based on Anomalous Conditions...... 7-8 7.3 Implications for Site Assessment...... 7-8 Chapter 8 Noninvasive Characterization Methods...... 8-1 8.1 Surface Geophysics ...... 8-1 8.1.1 Surface Geophysical Methods and Costs...... 8-1 8.1.2 Surface Geophysical Survey Applications...... 8-5 8.1.2.1 Assessing Geologic Conditions ...... 8-5 8.1.2.2 Detecting Buried Wastes and Utilities ...... 8-5 8.1.2.3 Detecting Conductive Contaminant Plumes ...... 8-12 8.1.2.4 Detecting DNAPL Contamination ...... 8-12 8.2 Soil Gas Analysis ...... 8-12 8.2.1 Soil Gas Transport and Detection Factors...... 8-12 8.2.2 Soil Gas Sampling Methods ...... 8-17 8.2.3 Soil Gas Analytical Methods ...... 8-21 8.2.4 Use of Soil Gas Analysis at DNAPL Sites...... 8-24 8.3 Aerial Photograph Interpretation...... 8-31 8.3.1 Photointerpretation of Site Conditions...... 8-31 8.3.2 Fracture Trace Analysis...... 8-31 Chapter 9 Invasive Methods ...... 9-1 9.1 Utility of Invasive Techniques ...... 9-1 9.2 Risks and Risk-Mitigation Strategies ...... ;...... 9-1 9.3 Sampling Unconsolidated Media...... :...... 9-4 9.3.1 Excavations (Test Pits and Trenches)...... 9-4 9.3.2 Drilling Methods...... 9-7 9.3.3 Sampling and Examination Methods ...... 9-7 9.4 Rock Sampling...... 9-14 9.5 Well Construction...... 9-22 9.6 Well Measurements of Fluid Thickness and Elevation...... 9-29 9.6.1 Interface Probes...... 9-29 9.6.2 Hydrocarbon-Detection Paste ...... 9-31 9.6.3 Transparent Bailers...... 9-31

001083 Vll CONTENTS 9.6.4 Other Methods...... 9-31 9.7 Well Fluid Sampling ...... 9-33 9.8 Assessing DNAPL Mobility ...... 9-33 9.9 Borehole Geophysical Methods...... 9-33 9.10 Identification of DNAPL in Soil and Water Samples ...... 9-38 9.10.1 Visual Detection of NAPL in Soil and Water ...... 9-38 9.10.2 Indirect Detection of NAPL Presence...... 9-45 9.10.2.1 Effective Solubility ...... 9-45 9.10.2.2 Assessing NAPL Presence in Soil Based on Partitioning Theory...... 9-46 9.11 Integrated Data Analysis ...... 9-46 Chapter 10 Laboratory Measurements: Methods and Costs...... 10-1 10.1 DNAPL Composition ...... 10-1 10.1.1 Infrared (IR) Spectrometry ...... 10-1 10.1.2Chromatography ...... 10-7 10.1.2.1 Gas Chromatography/Mass Spectrometry (GC/MS) ...... 10-7 10.1.2.2 High Performance Liquid Chromatography with Mass Spectrometry (HPLC/MS)...... 10-9 10.2 Saturation ...... 10-9 10.3 Density (Specific Gravity)...... 10-11 10.3.1 Displacement Method for Solids...... 10-11 10.3.2 Density of Liquids by Westphal Balance Method ...... 10-12 10.3.3 Density of Liquids by Densitometers...... 10-12 10.3.4 Specific Gravity Using a Hydrometer...... 10-12 10.3.5 Density of Liquids by Mass Determination...... 10-12 10.3.6 Certified Laboratory Determinations ...... 10-12 10.4 Viscosity...... 10-12 10.4.1 Falling Ball Method...... 10-12 10.4.2 Falling Needle Method ...... 10-16 10.4.3 Rotating Disc Viscometer ...... 10-16 10.4.4 Viscosity Cups ...... 10-16 10.4.5 Certified Laboratory Analyses for Viscosity ...... 10-16 10.5 InterfacialTension...... ^,...... 10-16 10.5.1 Surface Tension Determination by Capillary Rise ...... 10-16 10.5.2 duNouy Ring Tensiometer Method...... 10-16 10.6 Wettability...... 10-19 10.6.1 Contact Angle Method ...... 10-19 10.6.2 Amott Method...... 10-19 10.6.3 Amott-Harvey Relative Displacement Index ...... 10-21 10.6.4 United States Bureau of Mines (USBM) Wettability Index...... 10-21 10.6.5 Modified USBM Wettability Index ...... 10-21 10.6.6 Other Methods...... 10-21 10.7 Capillary Pressure Versus Saturation...... 10-21 10.7.1 Cylinder Methods for Unconsolidated Media ...... 10-24 10.7.2 Porous Diaphragm Method (Welge Restored State Method) ...... 10-24 10.7.3 Mercury Injection Method ...... 10-24 10.7.4 Centrifuge Method...... 10-27 10.7.5 Dynamic Method Using Hassler's Principle...... 10-27

001084 available to investigate and interpret the transport and 2 INTRODUCTION fate of DNAPL in the subsurface. geose npaiqveous phase liquids (DNAPLs), such as some chlorinated solvents, creosote based wood-treating Lighter-than-water NAPLs (LNAPLs) which do not sink oils, coal tar wastes, and pesticides, are immiscible fluids through the saturated zone, such as petroleum products, with a density greater than water. As a result of are also present and cause groundwater contamination at widespread production, transportation, utilization, and numerous sites. Although many of the same principles disposal of hazardous DNAPLs, particularly since 1940, and concerns apply at both LNAPL and DNAPL sites, there are numerous DNAPL contamination sites in North LNAPL site characterization is not specifically addressed America and Europe. The potential for serious long-term in this document contamination of groundwater by some DNAPL chemicals at many sites is high due to their taridty, limited solubility (but much higher than drinking water limits), 2.1 MANUAL OBJECTIVES and significant migration potential in soil gas, groundwater, and/or as a separate phase (Figure 2-1). This manual is designed to guide investigators involved in DNAPL chemicals, especially chlorinated solvents, are the planning and implementation of characterization among the most prevalent grouadwater contaminants studies at sites suspected of having subsurface identified in groundwater supplies and at waste disposal contamination by DNAPLs. Specifically, the document is sites. intended to: The subsurface movement of DNAPL is controlled • Summarize the current state of knowledge for substantially by the mature of the release, the DNAPL characterizing DNAPL-contaminated sites; density, intertfedal ttmkxi, and viscosity, porous media capillary properties, and, usually to a lesser extent, • Develop a framework for planning and implementing hydraulic forces. Below the water table, non-wetting DNAPL site characterization activities; DNAPL migrates preferentially through permeable pathways such as soil and rock fractures, root holes, and • Provide a detailed discussion of the types of data, tools, sand layers that provide relatively* little capillary and methods that can be used to identify, characterize, resistance to flow. Visual detection of DNAPL in soil and monitor DNAPL sites, and an analysis of their and groundwater samples may be difficult where the utility, limitations, risks, availability, and cost; DNAPL is transparent, present in low saturation, or distributed heterogeneousty. These factors confound • Identify and illustrate methods, including the characterization of the movement and distribution of development of conceptual models, to interpret DNAPL even at sites with relatively homogenous soil and contaminant fate and transport at DNAPL sites based a known, uniform DNAPL source. The difficulty of site on the data collected; characterization is further compounded by fractured • Assess new and developing site characterization bedrock, heterogeneous strata, multiple DNAPL mixtures methodologies that may be valuable and identify and releases, etc. additional research needs; and, Obtaining a detailed delineation of subsurface DNAPL, therefore, can be very costly and may be impractical using • Review the scope of the DNAPL contamination conventional site investigation techniques. Furthermore, problem, the properties of DNAPLs and media, and the risk of causing DNAPL migration by drilling or other DNAPL transport processes to provide context for actions may be substantial and should be considered prior understanding DNAPL site characterization. to commencing field work. Although DNAPL can greatly complicate site characterization, failure to adequately The primary goal of this manual is to help site managers define its presence, fate, and transport can result in minimize the risks and maximize the cost-effectiveness of misguided investigation and remedial efforts. Large site investigation/remediation by providing the best savings and environmental benefits can be realized by information available to describe and evaluate aaivities conducting studies and implementing remedies in a cost- that can be used to determine the presence, fate, and effective manner. Cost-effective DNAPL site transport of subsurface DNAPL contamination. management requires an understanding of DNAPL properties and migration processes, and of the methods

L 001085 • the fact that much DNAPL waste consists of off- 3 DNAPL TYPES AND SCOPE OF PROBLEM specification materials, production process residues, and spent materials. 3.1 INTRODUCTION Physical and chemical properties of numerous DNAPL The potential for widespread contamination of chemicals are provided in Appendix A. groundwater by DNAPLs is substantial because of the extensive production, transport, utilization, and disposal of large volumes of DNAPL chemicals during the 20th 3.2 HALOGENATED SOLVENTS Century. Some DNAPL wastes are older, such as coal tar generated as early as the 1820s at manufactured gas sites Halogenated solvents, particularly chlorinated in the eastern U.S. There are literally thousands of sites hydrocarbons, and brominated and fluorinated in North America where DNAPLs may have been hydrocarbons to a much lesser extent, are DNAPL released to the subsurface in varying quantities (NRC, chemicals encountered at contamination sites. These 1990, p.24). At some of these sites, tons of DNAPL were halocarbons are produced by replacing one or more released over time and DNAPL presence is obvious in hydrogen atoms, with chlorine (or another halogen) in subsurface materials. At most sites, however, the limited petrochemical precursors such as methane, ethane, volume of DNAPL present hinders direct identification ethene, propane, and benzene. Many bromocarbons and even though it is sufficient to provide a source for fluorocarbons are manufactured by reacting chlorinated significant groundwater contamination. As a result, hydrocarbon intermediates (such as chloroform or carbon DNAPL chemicals are frequently detected at tetrachloride) with bromine and fluorine compounds, contamination sites even where DNAPL presence has not respectively. DNAPL halocarbons at ambient been determined. environmental conditions include: chlorination products of methane (methylene chloride, chloroform, carbon The most prevalent DNAPL types are outlined in Table tetrachloride), ethane (1,1-dichloroethane, 1,2- 3-1 with summary information on DNAPL density, dichloroethane, 1,1,1-trichloroethane, 1,1,2,2- viscosity, production, and usage, and selected tetrachloroethane), ethene (1,1-dichloroethene, 1,2- contamination site references. The major DNAPL types dichloroethene isomers, trichloroethene, include: halogenated solvents, coal tar and creosote, PCB tetrachloroethene), propane (1,2-dichloropropane, 1,3- oils, and miscellaneous or mixed DNAPLs. Of these dichloropropene isomers), and benzene (chlorobenzene, types, the most extensive subsurface contamination is 1,2-dichlorobenzene, 1,4-dichlorobenzene); fluorination associated with halogenated (primarily chlorinated) products of methane and ethane such as 1,1,2- solvents, either alone or within mixed DNAPL sites, due trichlorofluormethane (Freon-11) and 1,1,2- to their widespread use and properties (high density, low trichlorotrifluorethane (Freon-113); and, bromination viscosity, significant solubility, and high tenacity). As products of methane (bromochloromethane, shown in Figure 3-1, pure chlorinated solvents are dibromochloromethane, dibromodifluoromethane, generally much more mobile than creosote/coal tar and bromoform), ethane (bromoethane, 1,1,2,2- PCB oil mixtures due to their relatively high tetrabromoethane), ethene (ethylene dibromide), and densityrviscosity ratios. propane (l,2-dibromo-3-chloropropane). Although the physical properties of pure DNAPL Although most chlorinated solvents were first synthesized chemicals are well-defined, the physical properties of during the 1800s, large-scale production generally began subsurface DNAPLs can vary considerably from that of around the middle of the 1900s primarily for use as the pure DNAPL compounds due to: solvents and chemical intermediates. Annual production rates at five-year intervals between 1920 and 1990 for • the presence of complex chemical mixtures, selected chlorinated solvents and other DNAPL chemicals are shown in Table 3-2 and Figure 3-2. An estimated 29 • the effects of in-situ weathering (dissolution, billion Ibs of chlorinated hydrocarbons were produced in volatilization, and degradation of the less persistent the U.S. during 1990 (U.S. International Trade Commission, 1991). The uses of six common chlorinated DNAPL fractions), and, solvents are illustrated in Figure 3-3. Fluorocarbons were discovered in the search for improved refrigerants by General Motors in 1930. In the U.S.,

L 001086 Table 3-1. DNAPL Types: Sources, Use, Properties, ContUBiiMtion, Mid Reference§. DNAPL Typ«,D Holega a* Ifydmarian Sotvena Hato enated(pi sd) aolveajta nave been Chto i at the (such as dichloroethene, tiicUaroethene, widelyC used • atanufacturtag and deanraf industries since Gloucester Landfill in Ottawa, Ontario tetrechloroethane, dkhtoroethane, tricUoroethane, and/or packaging about the 1940s. Prodnction and use of these solvents has (Jackson et al., 1985;, Jackson and methytene chloride, chloroform, carbon tetncUoride, Vapor degreasing operations generally proliferated with time, but demand for some Paltenon, 1989; Jackson et aL, 1990; and bromofonn, ethytene dibromide, cUorobenzeae, and dry cleaning. solvents has diminished due to environmental, cost, and/or LeSage et aL, 1990) chlorotoluene) Electronic equipment manutacturing other factors. U.S. production estimate* for selected Dry plasma etching of aemkxnductor chlorinated aolvenu in 1990 include: 484,000,000 Ibs of Solvent contamination at the IBM Dayton Halogenated hydrocarbon solvents are produced by chip. chloroform; 461,090,000 Ibs of nethytene chloride; fadmy in South Bnmswicfc, NJ. (Anhoffet replacing one or more hydrogen (loon with chlorine CdflUNrter owl* tod autno&ctiifinc 802,000,000 Ibs of 1,1,1-tridiloroethane; 372,000,000 Ibs of aL, 1981; CH2M-HU, 1989; Stipp, 1991) (or another halogen) in petrochemkal precunon tuch Metal parta/produ ufacturing tetrachloroethene; and 237,000,000 Ibs of ddorobemzne (US. ai methane, ethytene, and benzene. Aircraft and automotive manufacturing, International Trade Commission, 1991). An estimated Solvent contamination of fractured shale at 620,400,000 Ibs of waste solvents were produced by Oak Ridge, Tennessee (Kneper et at, 1991) Specific gravities at 20° C of the pure batofenated Machine shops and metal works degreasing operations in 1974. aolventi listed above range from approximately 1.08 Tooi-aad-dfc plants VOC contamination at the General Milk (chtorotoliiene) to 2.89 (bromoform). rbriogenaled solvents are among the contaminants moat •He in Minneapolis, Minnesota (CWM-Hffl, fibs nrauCKturiftg MM frequently detected at subsurface contamination sites. They 1989) Absolute viscosities at 20° C of the pure compounds are associated with waste disposal and chemical releases from listed above range from approximately 0.36 cp (1,1- Dp a* ^manufacturing numerous industries and operations. Due to their extensive Odormated solvent contamination of dichloroethene) to 2.04 cp (bromofonn). Phafmaceuticsl manufacturing release, high density, low viscosity, and toxic nature, production wells in Birmingham, UX Plastics manufacturing chlorinated solvents present the most severe DNAPL (Riven et al., 1990) Plane retardaat materials contamination problem. msjtnfacttifing Release of U-dkUoroethane due to a train Refrigerants manutacturing derailment in British Coroubia (Dakin and Military equipment manufacturing and Hoboes, 19S7) maintenance Pnntiftg preaaca and puMishuig Other References: operations Begor et al. (1989), CH2M-HJI1 (1989), Septic tank cleaners Feenstra and Cherry (1988), Mackay and Textile processing, dying, and finishing Cherry (1989), Holmes and CambeD (1990), operations Roberlaon (1992), Schaumburg (1990) Solvent and carrier fluid formulations in rubber coatings, solvent soaps, pnBtiB£ nto, BQMMVCS wid (luct* silicones Insecticide and herbicide production Waste disposal sites

001087 Table 3-1. DNAPL Types: Sources, Use, Properties, Contamination, and Reference*.

DNAP: • . ' L Type, >:^So:->:-StttttlBlC^Citiylliy;^;::;-::::- :<•: •:•:•:•:•:•:•:•:•:•:•:•:•:•:-:•:•:-.•:•:. - y:-:-: •:•:•;•:•:•: Coal Tar and Creosote Wood treating punts There are an estimated 700 active and abandoned wood- Union Pacific Railroad Tie Plant in Coal tar distillation plants treatment plants in the US. In 1978,188 of 631 wood- Laramte, Wyoming (Sate and Piontek, 1988; Ifcxivcd from the destrudrvedkttilUtion of cosJu coke Sted industry coking opentions treatment plants hi the U.S., operating predominantly i Sale et at, 1988; and Sale et at, 1989) ovens «nd retorts, coal tar k eompoied of thousands of Manufactured gas (coal gasification) the eastern seaboard, in the southeast, and in the Pacific hydrocarbons dominated by PAH« (poh/cydic ironutic plants northwest, were reported using creosote and/or coal tar Abandoned creosote waste she In Conroe, hydrocarbons with a «ib*Uati>l content of naphthalene Roofing tan (McGinnis, 1989). Tens (Bedient et aL, 1984) compound*) that are Bind with lesser amounts of tar Road tan acids such as phenol Md octal; N-, S-, and O- Manufactured gas plants produced town' gas for lighting and American Creosote Works she ia heterocycUc aromatic compounds; and <5* BTEX heating primarily between 1850 and 1950. More than 900 Penssxoto, Florida (Troutmaa et at, 1984; (benzene, toluene, ethylbennae, and xyteaes). coal gasification plants were operational in the US. in 1920 Mattraw and Franks, 1984; Ooertttz et al, (Rhodes, 1979). 1985; USGS, 1985; and, Franks, 1987) Creosote consists of various coal tar distillates (primarily the 200-400° C fractions) blended to meet There were 64 coal tar producers and 24 coal tar distillation ReiUy Tar site In St Louis Park, Minnesota product standards. It is estimated to contain plants producing creosote in the US. ia 1972 (USDA. 1980). (Erttch et aL, 1982; and, Hull and approximately 85% PAHa, 10% phenoHc compounds, In 1986, an estimated 1000 million Ibs of creosote were Scfaoenberg, 1984) and5%N-,S-,andO-beterocydics. Forwood- utilized by 415-550 creosotlng operations in the US. (MueDer treatment applications, creosote may be applied et si., 1969). In 1990, an estimated S96 million liters of crude Manufactured gas plant site in Stroudsburg, wkhcoaltarorapetioleiHBoU coal tar and 297 million liters of creosote oil were produced Pennytvanla (VUlaume et aL, 1983; and, (such as diead fud) in ratios that ranfe from 80:20 to in the US. (U.S. International Trade CommMon, 1991). Vfflaume, 1985) 50:50, creosotecsrner. Urge quantities of DNAPL were released at some wood Maaatactured gas plant she to WalHngford, The specific gravity of creosote is typkaUy between 1.01 treatment and manufactured gas plant sites due to the Connecticut (Conway et al 1985; and, and 1.05, but ranees up to 1.14 In certain bknds. The longtenn use and/or generation of large quantities of coal tar Quinn et aL, 1985) n spedAc gravity of coal tar ranges between 1.01 and and creosote <^»*««**^i« and the waste dispnaal practices nt 1.18. The viscosity of creosote and coal tar Is generauy these sites. DNAPL contamination at wood tualmnt sates Other references: much greater than that of water, typically in the range derives bom leaking tanks and pipelines, dripping treated Anstin (1984), Baechkr and MacFarlane of 10 to 70 cp. lumber, leaking holding ponds, etc. In 1988, approximately 40 (1990), Bdangeret aL (1998), Edison creosote/coal tar wood treatment sites were on the National Electric Institute (1984), Feenatra and Priority List of CERCLA sites (USEPA, 1988). Cherry (1990), OhiorseetaL (1990), ORI (1987), Konasewich et al. (1990), Utbertand and Anderson (1990), McGfauus et aL (1991), Mueller et aL (1989), Murarka (1990), Raven and Beck (1990), RosenfeU and Ptamb (1991), USDA (1980), USEPA (19894). VuTaume (1984)

001088 Table 3-1. DNAPL Types: Sources, Use, Properties, Contamination, and References. DNAPL Type, PCBs (and mixtures of PCBs and organic solvents such Transformer/capacitor oil production, In the US., the only targe pradncer of PCBs was Monsanto TnMiomeT ofl rnBtaniinallnn site fa as chlorinated benzenes and mineral oil) reprocessing, and disposal faculties Chemical Co., whkh loM them between 1929 and 1977 under Retina, Saskatchewan (Robertt et al., 1982; the Arodor trademark PCS production peaked in 1970 Schwartz et at, 1982; and, Anderson and PCBs (Polychlorinated Biphenyb) are extremely stable, 1929 and 1971, PCBs were when more than 85 million It* were produced in the U.S. by Pankow, 1986; Atwnier, 1984) nonflammable, dense, and viscous liquids that have sold for uae as dkkctrk fluids in Monsanto of which 57% was Aroctor 1242 (HEW, 1972). been primarily used as insulators in electrical electrical transformers and capacitor*, Due to environmental concerns, Monaanto rnand production Contamination at a PCB storage and transformers and capacitors. They are formed by m oil-filled switches, electromagnets, of Aroctor 12«0 in 1971; restricted the ate of other PCBa to transfer station In SmithvUle, Ontario substituting chlorine atoms for hydrogen atoms on a voltage regulators, beat transfer media, totally cHgoBcd system (ctectnoi fruitful tiici'i, Ca^Mcnon, (Feeostra, 1989; Mckhnin el at, 1989) biphenyt (double benzene ring) mokcule. CommcHial Ore retardants, hydraulic fluids on and electromagnets) in 1972; and, ccaaed aU production and PCBs are a series of technical mixtures, consisting of that handled hot metals to tale of PCS* in 1977. In 1979, USEPA famed final rate* many homers and compounds. Monaanto Chemical reduce fire hazards, lubricant*, cutting under the 1976 Tone Substances Control Act reatrktinf the Addison (1983), Atford-Stevens (1986), Co. sett PCBs using the trade name Arodor*. Bach oils, ptasUdzen, wax extenders, manufacture, processing, use, and distribution of PCBa to Derks (1990), Feenstra (1989), Griffin and Arodor is identified by a four-digit number such as carbonless copy paper, paints, inks, specifically exempted and authorized activities. OHM (1980), HEW (1972), Hutzmger et 1254. The first two digits, 12, Indicate the twelve adhesives, vacuum pumps, gas- al. (1974), Lavigne (1990), Mcletwain et al. carbon in the biphcnyl double ring. The tost two digits transmission turbines, and dedusling In 1977, it was estimated that of the 1.25 billion Iba of PCBs (1989), Milkr (1982), Moeta et at (1976), indicate the weight percent of cmorine in the PCB sold In the U.S. since 1929,750 million Ibs (60%) were still in Moosaato (undated), Monsanto (1988), product mix. Arodor 1016 whkh contains use, 290 mfllkM Iba (23%) were in landfill awl dumps, 150 MOOR and Walker (1991), NRCC (1980), approximately 41% chlorine by weight, however, was In 1972, Monsanto restricted sales of million Iba (12%) had been otherwise released to the USEPA (1983), USEPA (1990c), Wa not named using this convention. PCBs to application* involving only environment, and only 55 mutton lb» (5%) had been (1991) dosed electrical systems (transformers, destroyed by incineration or degraded in the environment Specific gravities at 25° C and viscosities at 38° C of capacitors, and ekctromagneta). (Lavisne, 1990). The 1242,1254, and 1260 Arodors several PCBs are: comprise approximately 80% of the PCBa produced in the PCB Sp.G. Viscosity U.S. by Monsanto. Arodor 1221 1.18 12 cp Arodor 1232 1.27 37 cp Approximately 200,000 transformer* containing askarel (a Arodor 1016 137 55 cp generic name for PCB nukl) were in use In the US. Half of Arodor 1242 138 63 cp these were estimated to be Mill in service in 1990 (Derks, Arodor 1248 1.44 150 cp 1990). Arodor 1254 1.53 1900 cp Arodor 1260 1.62 sticky resin Approximately 17% of CERCLA sites involve PCB contamination (Haky et si, 1990). The potential for DNAPL Note that physical properties of PCB products are migration is greatest at sites where PCBs were produced, modified by mixture with driorobenzenea, mineral oil, reprocessed, and/or disposed in quantity. or other solvents. DNAPL mixtum and uncommon DNAPLt indudmg Chemical industry facilities Many industrial waste disposal sites contain complex DNAPLs Chlorinated organic chemical contamination pesticides and herbicides Waste handling, reproceasini mixtures derived from off-specification materials and process at hazardous waste sites in Niagara Falls, disposal sites N.Y. (Cohen et al., 1987; Faust et al., 1990; and, Finder et al., 1990) Motco CERCLA site in LaMarque, Tens (Connor et al., 1989; and, Newell el al., 1991)

001089 T

Note: AH values at 20-25 deg.C. except tor PCB viscosities which are at 38 deg. C (see Appendix A). 1,1,2,2-Tatrachtorotthane 1,2-Dtehtofopropane PCB Aroctor 1254 TrtcWoroethene' 1.1,2-TrichtoroBthane Methytene Chkxlde 1,1,1-Trichtoroethane •111.2-Dtchtofobenzene O

Figure 3-1. Specific gravity versus absolute viscosity for some DNAPLs. DNAPL mobility increases with increasing densityrviscosity ratios.

001090 Table 3-2. UA Production of Stiected DNAPL Chemicals In Ibs (VS. International Trade Commission date, no entry i i no data available).

:::>::^$|:-xi>»>^>:;:: : Che^tealllillli ; i llllll :;^SK;:i:;:;:;:^S:i: Iliiiiissssp. iiisSisiSSSsS? !!5!*'i^'i!i|!!!''^S^; ilill :|iiil: illill iiil iffiit IIMi • Aoittne Mm+& 1J3E-M7 l«4B+«7 iiiii3.26E+0i7 sstB+m g.72E+07 9 JOE +07 1J2E+08 1.20E+08 1.96E+0llil 8 3.98E+08 4.07E+08 «J9E+08 7.16B+W li9J8B+0t 8 o-Anttdtae - 1JOE+06 1J9E+06 1A5E+06 Benzyl chloride 133E+Q6 5.73E-I-05 Z38E+06 1.04E+07 1^2E+07 Z14E+07 6.20E+07 7J1E+07 Bronoethane f 4.03E+05 9.22E+06 1J7E+07 1.43E+07 Z10E+07 3XSOE+07 Ctfton dimtfidG t 3J5E+08 4.26E+08 5.WE+08 5.23E-t-08 7J7E+08 7.21E+OS 4.79E+08 3.77E+08 Carton tetncUoride ^ • SS8E+VJ 1.01E+08 1.93B+08 117E+08 Z87E+08 3.72E+08 S.94B+08 1J1E+0» 9.06E+OS 7.10E+08 M6B+08 4.13E+03 CHOTOWBBBOC 4XK+06 8^9B+0« Z3SE+08 3J3E+08 4J6E+OS 6.05E+08 5.46E+08 4A5E+08 3.06E+06 Z83B+08 Z37E+OS Chloroform 1.92E+06 3.0SE+06 9J2E+OS Z03E-I-07 4.04E+07 7.64E-t-07 USE +08 Z40E+08 Z6JE+0* 3J3E+08 Z75E+08 4J4B+03 Chloropiciin 5.70E+06 5.42E+06 1.09E+07 l,2-Dibromo-3-chloro- 3.06E+06 3.43E+06 propme Dibutyl phthstale 4STB+m 1.98E-I-07 Z39E+07 1A9B+07 ZOOE+07 2J9E+07 1^3E+07 1J3B+07 Z17E+07 1.74E+07 U-Dkhlorobenzene Z90E+06 5.85E-K)6 1.18E-KT7 1.74E-t-07 Z56E+07 2.47E+07 4.11E+07 «.«2E+07 5.47E+07 5.47B+07 4A7B+07 1,2 Dfchloroettune i 3.05E+08 5.10E+08 1J7E+W 2.46E+09 7.46E+0* 7.98E+09 1.11E+07 171E+10 138E+10 1,2-Dtdikxopropwie 6.11E+07 8.42E+07 7.70E+07 DJethyl phlhilate , 9.70E+06 1.61E+07 1J8E+07 1.68E+07 1.80E+07 Z06B+07 1.I7B+07 Z09E+07 1.72E+07 Dimethyl phthabte IJ88E+V7 3.77B+06 3.9SE+06 3J9B-f06 4.41E+06 8.12E+0« 6.77E+06 7.04E+M 7.65E+06 1.25E+07 Elhyleoe dibromide 2.97E+06 Z7SE+OB Mdhytene chloride 3.97E+87 7.40E+07 1.13E-I-08 2.11E+08 4^3E+08 4.97E+08 5.64E+08 4.67E+03 4.61E+06 NttrobenzcDe S32E+VJ 3.13E+07 3.92E+07 4.82E+07 6.91E-I-07 1.16E+06 3.97E+07 1.76E+08 1.62B+08 2ME+QS J.48E+08 4.14E+08 6.12E+08 9.13E+08

2-NitntoliKne 117B406 334E+01 6 1.10E+01 Pinlhioa ; S.17E+06 7.43E+06 1.66E+07 1.53E+07 Telnchloroelhene 1.78E+08 109E+08 4.29E+O8 7.07E+08 6.79E+OS 7.63E+08 6.78E+fl8 3.72B+08 1,2,4-Trichtorobenzene 1J2E+07 934E+06 l,l,l-Trichloroeth»De 3.66E+08 4J9E+08 6.92E+08 8.69E+08 8.02B+08 1,1,2-Trichloronuoro- 7J4E+07 1.70E+08 Z44E+O8 Z70E+08 1J8E+08 1.76E+08 134B+O3 raelhane

001091 3-7 U.S. Production of Selected DNAPLs 1920-1990

1200 Millions of Ibs Aniline 1000 Carbon Tetrachloride Chlorobenzene Chloroform 1.2-Dichlorobenzene 600 400 200

1930 1940 1950 1960 1970 1980 1990 Year

1000 Millions of Ibs Dibutyl Phthalate 800 - Dimethyl Phthalate -*- Methylene Chloride Nitrobenzene 600 - Tetrachloroethene Freon 11 400 -

200 -

1920 1930 1940 1950 1960 1970 1980 1990 Year Ref: US International Trade Commission

Hgure 3-2. U.S. production of selected DNAPLs in millions of Ibs per year between 1920 and 1990.

001092 3-8

Eipon Usein Solvent for diphenyl oxide pesticides formulations, ind diphenylphenol dHsocyanate manufacture production and decreasing auto 15% parts 37% Manufacture of chiorodifluoromethane (70% for refrigerant use, 30% for fluoropotymers) 90% Niirochlorobenzene manufacture 33% Chlorobenzene Chloroform (US Production: 237,000,000 Ibs in 1990) (US Production: 484,000,000 Ibs in 1990)

Industrial Paint removal metal products cleaning 24% (10%) Miscellaneous blowing, metal decreasing, Chemical Dry cleaning and electronic components (primarilintermediaty foe r textile processing degreasinf,, adhesive manufacture of 5.1% production, etc.) FluorocarbonF-113) 50* 28%

Methylene Chloride Tetrachloroethcne (US Production: 461,000,000 Ibs in 1990) (US Production: 372,000,000 Ibs in 1990)

Vapor decreasing of fabricated metal pans 10%

22% 1,1,1-Trichloroethane Trichloroethcne (US Production: 802,000,000 Ibs in 1990) (US Production: est. 170,000,000 Ibs in 1986)

Figure 3-3. Uses of selected chlorinated solvents in the U.S. circa 1986 (data from Chemical Marketing Reporter and U.S. International Trade Commission).

I

001093 3-9 fluorocarbon refrigerants have been produced primarily by and 1.20, viscosities much higher than water (typically 10 duPont under the trade name Freon. In 1990, to 70 cp), and the distinctive odor of naphthalene (moth approximately 918 million Ibs of fluorinated hydrocarbons balls). were produced in the U.S. (U.S. International Trade Commission, 1991). Of the 793 million Ibs of Historically, coal tar has been produced by coal tar fluorocarbons produced in I960: 46% were used as distillation plants and as a byproduct of manufactured gas refrigerants, 20% as foam blowing agents, 16% as plant and steel industry coking operations. Manufactured solvents, 7% as fiooropolymers (such as teflon), and < 1% gas plants began producing illuminating or "town" gas for as aerosol propellants (Austin, 1964). Prior to 1974, lighting and heating, and by-products for chemical when concerns arose regarding atmospheric ozone production, in several eastern cities circa 1820. More ^depletion, .aerosol propellants were the main end use than 900 gasification plants were operational in the U.S. (52%) of fluorocarbons. by 1920 (Rhodes, 1979). Substantial manufactured gas production continued until about 1950 when natural gas became widely available via pipeline. Currently, used to manufacture ethylene dtoromide (EDB) for approximately 98% of coal-tar produced in the U.S. is a Tin engine fuel antiknock fluids to prevent lead oxide by-product of blast furnace coke production (Austin, ^deposition (Austin, 1984). Use of EDB for this purpose, 1984). In 1990, U.S. production of crude coal tar was 158 however, has diminished with the phaseout of leaded million gallons (U.S. International Trade Commission, gasoline. Brominated hydrocarbon DNAPLs are used as 1991). fire retardants and fire extinguishing agents, and in a variety of other products. During the coking process, coal is heated to between 450° and 900° C for approximately 16 hours and transformed Chlorinated solvents are frequently detected in to coke and vapors by pyrolysis. The evolved coal vapors groundwater supplies and at disposal sites. For example, are then condensed to produce water and approximately as shown in Table 3-3, chlorinated solvents account for 8 to 9 gallons of liquid tar per ton of coal upon cooling. ten of the twenty organic contaminants detected most With a specific gravity of between about 1.15 and 1.20, frequently at contamination sites. The halogenated coal tar sinks and is separated for processing. This coal solvents present an extremely high contamination tar is then distilled fractionally to yield approximately: potential due to their extensive production and use, (1) 5% light oil (up to 200° C), (2) 17% chemical or relatively high mobility as a separate phase (high middle oil (200°-250°C), (3) 7%0 heavy oil (250°-300° C), densitymscosity ratio), yjgN«Jg»iit solubility, and high (4) 9% anthracene oil (300-350°C), and (5) 62% pitch toxidty. This is reflected in the physical properties, (Edison Electric Institute, 1984). production, and drinking water standards data for several common halogenated solvents provided in Table 3-4. Creosote consists of various coal tar distillates (primarily the 200°C to 400°C fraction) which are blended to meet Subsurface contamination derived from halogenated American Wood-Preservers' Association (AWPA) product solvents are associated with industries that produce standards. These creosote blends are then used alone or and/or use these DNAPLs and waste disposal sites. Their diluted with coal tar, petroleum, or, to a very limited subsurface presence is caused by: leakage from tanks, extent, pentachlorophenoL Existing AWPA product pipelines, drums, and other containers; spillage during specifications and physical properties are given in Table filling operations; and intentional discharge to landfills, 3-5. As shown, the specific gravity of creosote products pits, ponds, sewers, etc Halogenated solvents are without petroleum oil ranges from 1.07 to 1.13 (at 38° C frequently present in mixed DNAPL sites. to 15.5° C for water). Dilution with petroleum reduces the specific gravity of creosote-petroleum solutions to approximately 1.01 to 1.05. 33 COAL TAR AND CREOSOTE Commercial utilization of creosote/coal tar for pressure Coal tar and creosote are complex chemical mixture treating lumber in the United States commenced circa DNAPLs derived from the destructive distillation of coal 1870 with construction of a plant in Mississippi (USDA, in coke ovens and retorts. These oily DNAPLs are 1980). Numerous pressure-treating plants were generally translucent brown to black, and are constructed between 1870 and 1925 to meet the growing characterized by specific gravities that range between 1.01 demand for treated railroad cross-ties and bridge timbers.

001094 C-2 Dissolution is the process by which soluble organic for recovering additional oil (or NAPL) from the components from DNAPL dissolve in groundwater or subsurface. dissolve in infiltration water and form a groundwater contaminant plume. The duration of remediation Fingering refers to the formation of finger-shaped measures (either clean-up or long-term containment) is irregularities at the leading edge of a displacing fluid in determined by: (1) the rate of dissolution that can be a porous medium which move out ahead of the main achieved in the field, and (2) the mass of soluble body of fluid. components in the residual DNAPL trapped in the aquifer. Free-phase NAPL refers to immiscible liquid existing in the subsurface with a positive pressure such that it can Distribution coefficient refers to the quantity of the solute flow into a well. If not trapped in a pool, free-phase sorted by the solid per unit weight of solid divided by the DNAPL will flow vertically through an aquifer or laterally quantity dissolved in the water per unit volume of water. down sloping fine-grained stratigraphic units. Also called mobile DNAPL or continuous-phase DNAPL. DNAPL is an acronym for denser-than-water nonaqueous ghase liquid. It is synonymous with denser-than-water Gravity drainage refers to the movement of DNAPL in an immiscible-phase liquid. aquifer that results from the force of gravity. DNAPL body refers to a contiguous mass of DNAPL in Halogenated solvents are organic chemicals in which one the subsurface. or more hydrogen atoms in a hydrocarbon precursor such as methane, ethane, ethene, propane, or benzene, has DNAPL entry location refers to the area where DNAPL been replaced by a halogen atom, such as chlorine, has entered the subsurface, such as a spill location or bromine, or fluorine. Chlorinated solvents (e.g., 1,1,1- waste pond. trichloroethane, trichloroethene, and tetrachloroethene) have been widely utilized cleaning and degreasing DNAPL site is & site where DNAPL has been released operations. Halogenated solvents are DNAPLs. and is now present in the subsurface as an immiscible phase. Henry's Law Constant is the equilibrium ratio of the partial pressure of a compound in air to the Drainage refers to a process during which the saturation concentration of the compound in water at a reference of the wetting fluid is decreasing and the saturation of the temperature. It is sometimes referred to as the air-water nonwetting fluid is increasing in a porous medium. partition coefficient. Effective porosity is the ratio, usually expressed as a Heterogeneity refers to a lack of uniformity in porous percentage, of the total volume of voids available for fluid media properties and conditions. transmission to the total volume of the porous medium. Hydraulic conductivity is a measure of the volume of water Effective solubility is the theoretical aqueous solubility of at the existing kinematic viscosity that will move in a unit an organic constituent in groundwater that is in chemical time under a unit hydraulic gradient through a unit area equilibrium with a mixed DNAPL (a DNAPL containing of medium measured at right angles to the direction of several organic chemicals). The effective solubility of a flow. particular organic chemical can be estimated by multiplying its mole fraction in the DNAPL mixture by its Hydraulic containment refers to modification of hydraulic pure phase solubility. gradients, usually by pumping groundwater, injecting fluids, and/or using cut-off walls, to control (contain) the Emulsion refers to a dispersion of very small drops of one movement of contaminants in the saturated zone. liquid in an immiscible liquid, such as DNAPL in water. Hydraulic gradient is the change in head per unit distance EOR is an acronym for enhanced oil recovery, EOR in a given direction, typically in the principal flow refers to processes (such as cosolvent or steam flooding) direction.

001095 C-3 Imbibition is a process during which the saturation of the Mobile NAPL refers to contiguous NAPL in the wetting fluid is increasing and the saturation of the subsurface that is above residual saturation, not contained nonwetting fluid is decreasing in a porous medium. by a stratigraphic (capillary) trap or hydraulic forces, and therefore able to migrate as a separate phase is said to be Immiscible fluids do not have complete mutual solubility mobile. and co-exist as separate phases. Mobility is a measure of the ease with which a fluid moves Immobile NAPL is at residual saturation, or contained by through reservoir rock; the ratio of rock permeability to a stratigraphic (capillary) trap or hydraulic forces, and apparent fluid viscosity. therefore, cannot migrate as a separate phase. NAPL wet refers to media which are preferentially wet by Interface refers to the thin surface area separating two a particular NAPL rather than water. immiscible fluids that are in contact with each other. PAH is an acronym for gorycyclic aromatic hydrocarbons, Interfacial tension is the strength of the film separating a group of compounds composed of two or more fused two immiscible fluids (e.g., oil and water) measured in aromatic rings (i.e., naphthalene, anthracene, chrysene, dynes (force) per centimeter or millidynes per centimeter. etc). PAHs are introduced into the environment by • natural and anthropogenic combustion processes (i.e., Interphase mass transfer is the net transfer of chemical forest fires, volcanic eruptions, automobile exhaust, compounds between two or more phases. coking plants, and fossil fuel power plants). Creosote and coal tar are DNAPLs that contain a high PAH fraction. Interstitial velocity is the rate of discharge of groundwater per unit area of the geologic medium per percentage Partitioning refers to a chemical equilibrium condition volume of the medium occupied by voids measured at where a chemical's concentration is apportioned between right angles to the direction of flow. two different phases according to the partition coefficient, which is the ratio of a chemical's concentration in one Intrinsic permeability is a measure of the relative ease phase to its concentration in the other phase. with which a porous medium can transmit a liquid under a potential gradient. Intrinsic permeability is a property PCB is an acronym for Polychlorinated Biphenyl of the medium alone that is dependent on the shape and compounds. PCBs are extremely stable, nonflammable, size of the openings through which the liquid moves. dense, and viscous liquids that are formed by substituting chlorine atoms for hydrogen atoms on a biphenyl (double LNAPL is an acronym for less-dense-than-water benzene ring) molecule. PCBs were manufactured nonaqueous phase liquid. It is synonymous with less- primarily by Monsanto Chemical Company for use as dense-than-water immiscible-phase liquid. dielectric fluids in electrical transformers and capacitors. Linear soil partition coefficient refers to the ratio of the Phase refers to a separate fluid that co-exists with other mass concentration of a solute phase to its mass fluids. concentration in the aqueous phase. Plume refers to a zone of dissolved contaminants. A Macropores are relatively large pore spaces (e.g., fractures plume usually will originate from the DNAPL zone and and worm tubes) that characteristically allow the extend downgradient for some distance depending on site enhanced movement of liquid and gas in the subsurface. hydrogeologic and chemical conditions. To avoid confusion, the term "DNAPL" plume should not be used Mass exchange rate refers to the product of the mass to describe a DNAPL pool; "plume" should be used only exchange coefficient (dissolution rate) and some measure to refer to dissolved-phase organics. of NAPL-water contact area. It defines the strength of the dissolved contaminant source. Pool refers to a zone of free-phase DNAPL at the bottom of an aquifer. A lens is a pool that rests on a fine-grained Miscible means able to be mixed. stratigraphic unit of limited areal extent. DNAPL can be

001096 U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report

GEOHYDROLOGY OF THE MESILLA GROUND-WATER BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS

Prepared in cooperation with the NEW MEXICO STATE ENGINEER OFFICE, CITY OF EL PASO, TEXAS, U.S. SECTION-INTERNATIONAL BOUNDARY AND WATER COMMISSION, U.S. BUREAU OF RECLAMATION, and CITY OF LAS CRUCES, NEW MEXICO

001097 GEOHYDROLOGY OF THE MESLLLA GROUND-WATER BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS By Edward L. Nickerson and Robert G. Myers

U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 92-4156

Prepared in cooperation with the NEW MEXICO STATE ENGINEER OFFICE, CITY OF EL PASO, TEXAS, U.S. SECTION-INTERNATIONAL BOUNDARY AND WATER COMMISSION, U.S. BUREAU OF RECLAMATION, and CITY OF LAS CRUCES, NEW MEXICO

Albuquerque, New Mexico 1993

001098 CONTENTS Page Abstract...... ^ fotroductioa...... 2 Purpose and scope...... 2 Description of the study area ...... 4 Methods of investigation...... 4 Mesilla ground-water basin observation-well network...... 4 Mesilla Valley hydrologic sections ...... 4 West Mesa geohydrologic test holes...... 5 Acknowledgments...... _...... 5 Well-numbering systems...... 6 New Mexico system...... 6 Texas system...... 6 Geohydrology...... 8 Aquifer system in the Mesilla Valley ...... 20 Recharge and discharge mechanisms...... 20 Aquifer characteristics...... 23 River stage and ground-water levels...... 29 Ground-water movement...... 45 River/aquifer relations...... 49 Water quality...... 54 Aquifer in the West Mesa...... 55 Sunmiary aiid coiuiuaons...... ™^^ Selected references...... 67 FIGURES Figure 1. Map showing location of the study area...... 3 2. Diagram showing system of numbering wells in New Mexico...... ? 3. Diagram showing system of numbering wells in Texas...... 7 4. Map showing selected major faults of the Mesilla ground-water basin. New Mexico and Texas...... 11 5. Map showing location of observation wells, hydrologic sections, and geohydrologic test holes in the Mesilla ground-water basin, New Mexico and Texas...... 13

111

001099 GEOHYDROLOGY OF THE MESILLA GROUND-WATER BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS By Edward L Nickerson and Robert G. Myers ABSTRACT In 1983 the U.S. Geological Survey began a multiphase study of the geohydrologic system of the Mesilla ground-water basin in Dona Ana County, New Mexico, and El Paso County, Texas, to provide information for orderly development of ground-water supplies within the basin. Information is needed about the recharge and discharge mechanisms; aquifer characteristics; ground-water movement; river/aquifer relations; horizontal and vertical water-quality variability within the aquifer; and effects of structural geology on the lithology, water quality, and characteristics of the aquifer in the West Mesa. Methods of investigation include data collection from the (1) Mesilla ground-water basin observation-well network; (2) Mesilla Valley hydrologic sections; and (3) West Mesa geohydrologic test holes. The aquifer system of the Mesilla ground-water basin is in the Quaternary flood-plain alluvium and the Quaternary and Tertiary Santa Fe Group. The ground-water basin was divided into two areas of study: (1) the Mesilla Valley along the Rio Grande in the east, and (2) the West Mesa in the west. The direction of ground-water flow in the study area is south to southeast, toward the lower end of the basin. The hydraulic gradient in the shallow flood-plain alluvium within the Mesilla Valley is generally between 4 and 6 feet per mile. The hydraulic gradient in the Santa Fe Group ranges from about 100 feet per mile in the northwestern part of the study area to less than 2 feet per mile in the southwestern part of the study area. Recorded hydraulic gradients from the river to the aquifer identify the Rio Grande as a losing river at the Las Cruces, Mesquite, and Canutillo well-field hydrologic sections. The length and seepage rate of losing reaches of the Rio Grande may fluctuate with annual and seasonal variations in streamflow. Ground-water levels in nearby observation wells correspond to increases in river stage and indicate significant recharge to the aquifer at the river. Seasonal trends in the shallow water table generally correspond to recharge during the irrigation season. Water in storage within the Rio Grande flood-plain alluvium/Santa Fe Group aquifer system occurs under unconfined (water-table) and semiconfined (leaky-confined) conditions. Water in storage within the shallow flood-plain alluvium generally is unconfined. Water generally occurs within the Santa Fe Group under semiconfined conditions.

001100 Water moves from the shallow flood-plain alluvium to the upper Santa Fe Group through a series of interbedded gravel, sand, and clay lenses. Horizontal permeability usually exceeds vertical permeability by several orders of magnitude because of the heterogeneity and layering of the aquifer. The thickness and extent of finer grained, less permeable material increase vertically with depth and horizontally toward the southern end of the basin. Freshwater zones are overlain by zones of slightly saline to saline water in the Mesilla Valley. The shallow, slightly saline (1,000 to 3,000 milligrams per liter dissolved solids) to saline (greater than 3,000 milligrams per liter dissolved solids) water is flushed from the aquifer by surface-water recharge near the Rio Grande and irrigation canals. The zone of slightly saline water overlying the freshwater zone is absent or thin near the Rio Grande and increases in thickness away from the river. Water levels, drill cuttings, borehole-geophysical logs, and water-quality data were collected from four geohydrologic test holes drilled on the West Mesa. Geohydrologic data indicate that the thickness of the freshwater zone is significantly less than previously estimated in the vicinity of the proposed West Mesa well field. The thickness of the Santa Fe Group at the Lanark test hole on the horst between the Fitzgerald fault zone and the Mid-Basin fault zone is almost 500 to 900 feet less than previous estimates. Lithologic data, borehole-geophysical logs, water-quality data, and potentiometric contours of ground water in the upper Santa Fe Group indicate a hydraulic connection between the Mesilla Valley and the West Mesa. INTRODUCTION The significant increase in population within the Mesilla ground-water basin and adjacent areas has resulted in competition for existing ground-water resources. The City of El Paso, Texas, applied for water rights in New Mexico at the proposed West Mesa well field. Well applications (266) were filed with the New Mexico State Engineer Office on September 6-7,1980. The well applications were withdrawn subsequent to a settlement agreement on March 6, 1991. In 1983, the U.S. Geological Survey began a multiphase study to better define the hydrologic system of the Mesilla ground-water basin in Dona Ana County, New Mexico, and El Paso County, Texas (fig. 1). To provide for orderly development of ground-water supplies within the basin, information is needed about recharge and discharge; aquifer characteristics; ground-water movement; river/aquifer relations; and water quality within the aquifer. The study was conducted in cooperation with the New Mexico State Engineer Office; City of El Paso, Texas; U.S. Section-International Boundary and Water Commission; U.S. Bureau of Reclamation; and City of Las Cruces, New Mexico. Purpose and Scope The purpose of this study was to better define the geohydrologic system of the Mesilla ground- water basin in Dofla Ana County, New Mexico, and El Paso County, Texas. Specific objectives of the report were to evaluate recharge/ discharge mechanisms and aquifer characteristics, document ground-water levels, determine direction of ground-water flow, identify ground-water movement and river/aquifer relations, and determine water-quality zones at selected sites hi the Mesilla ground-water basin. The scope of the report is to present geohydrologic information determined as part of this study from January 1983 through March 1987, and to briefly summarize previously published information when necessary for discussion.

001101 i SanDieooMtn MESILLBASINA BOUNDARY San Agustin Mis oatMtn <° Sleeping Udy Hills La* Cruccs » Jornada fault zone

NEW MEXICO CHIHUAHUA, MEXICO El Paso Del Norte (El Paso Narrows)

10 20 KILOMETERS

Figure 1.-Location of the study area.

001102 GEOHYDROLOGY The Mesilla drainage basin includes the southern part of the Jornada del Muerto ground-water basin and the Mesilla ground-water basin (fig. 1). The Mesilla ground-water basin is separated from the Jornada del Muerto ground-water basin by the Jornada fault zone (Seager and others, 1987). The ground-water connection across the fault zone is considered slight, and flow between the basins is restricted by a buried volcanic ridge (horst) between Goat Mountain and Tortugas Mountain (fig. 4) (Wilson and others, 1981, p. 39). The horst is delineated by the Jornada fault zone on the eastern side and the Mesilla Valley fault zone (fig. 4) on the western side. Several test holes drilled in the center of the horst between 1979 and 1986 penetrate few or no thin, water-saturated sediments. However, there may be buried arroyo channels incised into the ridge that allow some water to pass from the Jornada del Muerto ground-water basin into the Mesilla ground-water basin. Several fault zones and major faults in the Mesilla ground-water basin form a series of horsts and grabens (fig. 4) that affect the thickness of basin-fill sediments and the occurrence of ground water. These include the East Potrillo fault zone, West Robledo fault zone, East Robledo fault zone, Fitzgerald fault zone, Mid-Basin fault zone, Mesilla Valley fault zone, and Jornada fault zone. The Rio Grande enters the Mesilla ground-water basin in the north from Rincon Valley through Selden Canyon and exits to the south at El Paso Narrows (fig. 1). Some ground water enters the Mesilla ground-water basin from Selden Canyon through thin alluvial sediments overlying the bedrock in the river channel of the Rio Grande. Some ground water leaves the Mesilla ground-water basin through thin alluvial sediments overlying the bedrock in the river channel of the Rio Grande at El Paso Narrows. The aquifer system in the Mesilla ground-water basin is composed of two stratigraphic units: (1) the Quaternary alluvium of the Rio Grande flood plain, and (2) the Quaternary and Tertiary Santa Fe Group basin fill, which is of Pleistocene to Miocene age (King and others, 1971). The Rio Grande flood-plain alluvium occurs beneath the Mesilla Valley in the eastern part of the basin. The flood-plain alluvium generally ranges in thickness from 50 to 125 feet (Wilson and others, 1981, p. 27) and consists of sand and gravel with lenses of silt and clay (Hawley, 1984). The Santa Fe Group, which extends throughout the basin, consists of clay, silt, sand, gravel, and caliche, and some occasional igneous rocks composed of volcanic ash and basalt. The thickness of the Santa Fe Group ranges from zero to greater than 5,000 feet (Hawley, 1984) within the study area. In the west-to-east hydrogeologic sections of Hawley (1984), the thickest part of the aquifer generally is west of the Mesilla Valley fault zone, beneath the Mesilla Valley. The Santa Fe Group is composed of at least four formations: (1) Camp Rice Formation; (2) Fort Hancock Formation; (3) Hayner Ranch Formation; and (4) Rincon Valley Formation. An unnamed upper part of the Santa Fe Group composed of an eolian fades possibly of Pliocene to Miocene age occurs in the central-southern part of the basin (Hawley, 1984).

001103 J Hawley (1984) divided the aquifer system into four major types of depositional environments. These are (1) valley-fill deposits, which correlate with the Rio Grande flood-plain alluvium; (2) younger basin-fill deposits characterized by basin-floor fluvial to deltaic fades, which correlate with the Camp Rice and Fort Hancock Formations; (3) younger basin-fill deposits characterized by piedmont-slope and basin-floor fades, which correlate with the Camp Rice and Fort Hancock Formations and the unnamed eolian fades; and (4) older basin-fill deposits characterized by piedmont-slope and basin-floor fades, which correlate with the basal Camp Rice Formation and the Rincon Valley and Hayner Ranch Formations of the lower Santa Fe Group. The Santa Fe Group can be divided into the lower Santa Fe Group, composed of one lithologic unit or lithofacies, and the upper Santa Fe Group, composed of two lithologic units or lithofades (Mack, 1985). The lower Santa Fe Group is predominantly composed of clay, silt, sandstone, mudstone, and conglomerate, and shale with some lenses of sand. The lower unit of the upper Santa Fe Group is predominantly a mixture of day, sand, and gravel with discontinuous zones of calcite. Grain size decreases in the northern part of the basin from east to west (Mack, 1985). The lower lithologic unit of the upper Santa Fe Group sometimes intertongues with the upper unit and also with the underlying lower Santa Fe Group. The upper unit of the upper Santa Fe Group correlates with the Camp Rice Formation; formation names or boundaries for the lower unit of the upper Santa Fe Group and the lower Santa Fe Group cannot be applied with any degree of certainty (Mack, 1985). The upper unit of the upper Santa Fe Group is predominantly composed of sand with lenses and discontinuous layers of clay, silt, and gravel. The clay lenses thicken southward (Peterson and others, 1984). In the northern part of the basin, the gravel content decreases with depth (Mack, 1985). The Mesilla ground-water basin observation-well network was established in 1983 (Nickerson, 1986) to monitor water levels in the flood-plain alluvium/Santa Fe Group aquifer system. The locations of observation wells in the Mesilla ground-water basin are shown in figure 5. Records of selected wells, including annual water-level measurements, are listed in table 1 (tables are in the back of the report). Chemical analyses of water samples from selected wells are listed in table 2. Hydrographs showing monthly water levels in selected observation wells are shown in figure 6. The U.S. Bureau of Redamation has maintained a series of observation wells in the Mesilla Valley since 1946. These wells are completed in the flood-plain alluvium at depths ranging from 15 to 40 feet below land surface. Hydrographs showing annual February water levels since 1946 in selected Bureau of Reclamation observation wells are shown in figure 7. The general direction of ground-water flow in the aquifer system is south-southeast, toward the lower end of the basin. The water-table contour map of the aquifer in the flood-plain alluvium is shown in figure 8. The contours were constructed from water-level measurements collected in February 1985. The hydraulic gradient in the flood-plain alluvium generally ranges from 4 to 6 feet per mile. The potentiometric-surface map of the aquifer in the Santa Fe Group is shown in figure 9. The potentiometric contours were constructed from water-level measurements collected from January to March 1985. The hydraulic gradient in the Santa Fe Group ranges from about 100 feet per mile in the northwestern part of the study area to less than 2 feet per mile in the southwestern part of the study area.

001104 SUMMARY AND CONCLUSIONS The Mesilla ground-water basin is located in the central, southern, and western part of the Mesilla drainage basin in Dona Ana County in south-central New Mexico, El Paso County in Texas, and the State of Chihuahua in Mexico. The major aquifer of the basin is in the Quaternary flood- plain alluvium and Quaternary and Tertiary Santa Fe Group. The ground-water basin was divided into two areas of study: (1) the Mesilla Valley along the Rio Grande in the east, and (2) the West Mesa in the west. The direction of ground-water flow in the Mesilla Valley study area is south to southeast toward the lower end of the basin. The hydraulic gradient in the shallow flood-plain alluvium within the Mesilla Valley generally is between 4 and 6 feet per mile. The hydraulic gradient in the Santa Fe Group ranges from about 100 feet per mile in the northwestern part of the study area to less than 2 feet per mile in the southwestern part of the study area. Rio Grande streamflow is the primary source of recharge to the aquifer in the Mesilla Valley. The net transfer of water to or from the aquifer by recharge and discharge mechanisms is directly related to Rio Grande streamflow and the volume of river water available for irrigation. Most recharge to the aquifer in the Mesilla Valley is from Rio Grande seepage in losing reaches of the stream, seepage from irrigation canals, and infiltration of applied irrigation water. The Rio Grande predominantly is a losing stream along most of the 62-mile reach in the Mesilla Valley. The length and seepage rate of losing reaches of the Rio Grande may fluctuate with annual and seasonal variations in streamflow. Most discharge from the aquifer occurs as flow to agricultural drains, seepage to the Rio Grande in gaining reaches of the stream, well discharge, and evapotranspiration. Slight river gains have been reported in short upstream reaches and in the extreme lower reach of the river. Annual ground-water withdrawal may vary considerably depending on the volume of surface water available from the Rio Grande. Water in the Rio Grande flood-plain alluvium/Santa Fe Group aquifer system is present under unconfined (water-table) and semiconfined (leaky-confined) conditions. Water in the shallow flood- plain alluvium generally is unconfined. Water generally occurs within the Santa Fe Group under semiconfined conditions. Water moves from the shallow flood-plain alluvium to the upper Santa Fe Group through a series of interbedded gravel, sand, and day lenses. Thin, interbedded clay lenses in the lower part of the flood-plain alluvium and upper part of the Santa Fe Group restrict vertical flow and result in semiconfined conditions at depth. Horizontal permeability usually exceeds vertical permeability by several orders of magnitude. The thickness and extent of finer grained, less permeable material increase vertically with depth and horizontally toward the southern end of the basin. River stage and ground-water levels were recorded at the Las Cruces, Mesquite, and Canutillo well-field hydrologic sections. Water-level records for water years 1985 and 1986 represent Rio Grande stage and potentiometric heads in the aquifer system during wet years, with full surface- water allocation from the Rio Grande. Downward vertical hydraulic gradients were recorded in all well groups at the Mesilla Valley hydrologic sections. Seasonal trends in the shallow water table generally correspond to recharge during the irrigation season. Under static conditions, potentiometric head in observation wells completed within the upper 350 feet of the aquifer system generally corresponds to seasonal trends in the shallow water table.

65 I 001105 SIMULATION OF GROUND-WATER FLOW IN THE MESILLA BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS SUPPLEMENT TO OPEN-FILE REPORT 88-305 NEW MEXICO DEPT. Water-ResourceU.S. sGEOLOGICA InvestigationL sSURVE ReporYt 91-4155 --./•

Prepared in cooperation with the U.S. SECTION, INTERNATIONAL BOUNDARY AND WATER COMMISSION- United States and Mexico

001106 SIMULATION OF GROUND-WATER FLOW IN THE MESILLA BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS SUPPLEMENT TO OPEN-FILE REPORT 88-305 By Peter F. Frenzel

U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 91-4155

Prepared in cooperation with the U.S. SECTION, INTERNATIONAL BOUNDARY AND WATER COMMISSION- United States and Mexico

Albuquerque, New Mexico 1992

\

001107 CONTENTS Page Abstract...... 1 Introduction...... 2 Purpose and scope ...... 4 Previous investigations...... 4 Well-numbering systems...... 5 Acknowledgments...... 5 Description of the Mesilla Basin...... 8 Physical features...... 8 Climate...... 9 Population, industry, and agriculture...... 10 Surface-water system...... 11 Ground-water system...... 11 Hydrogeology of the basin-fill deposits...... 12 Hydrogeologic boundaries...... 15 Mesilla Valley boundary...... 16 Net irrigation flux...... 18 Evapotranspiration from nonirrigated lands...... 21 Seepage to and from streams...... 21 Nonirrigation withdrawals and returns...... 22 Mountain- and slope-front recharge...... 24 Summary of geohydrology...... 24 Simulation of ground-water flow...... 25 Description of the model...... 25 Model grid...... 26 Aquifer characteristics...... 26 Hydraulic conductivity and transmissivity...... 29 Leakance...... 35 Specific yield and storage coefficients...... 36 Initial condition and time periods...... 36 Boundary conditions...... 37 No-flow boundary...... 37 Recharge...... 38 Underflow...... 41 Mesilla Valley boundary...... 41

ill

L001108 CONTENTS--Concluded Page Flow to and from the river and drains...... 41 Evapotranspiration from nonirrigated lands...... 42 Evaporation from streams ...... 42 Net irrigation flux...... 42 Nonirrigation withdrawals...... 44 Model adjustments...... 44 System properties used for comparison...... 44 Surface-water depletions...... 45 Drain discharges...... 47 Hydraulic heads...... 47 System properties adjusted...... 49 Extinction depth...... 50 Recharge...... 50 Specific yield and specific storage...... 50 Model boundary...... 56 Hydraulic conductivity...... 56 Effects of existing withdrawals on flow in the Rio Grande...... 57 Model evaluation and sensitivity tests...... 62 Summary and conclusions ...... 64 References...... 66 FIGURES Figure 1. Map showing location of the study area...... 3 2. Diagram showing system of numbering wells in New Mexico...... 6 3. Diagram showing system of numbering wells in Texas...... 7 4-6. Graphs showing: 4. Average annual and April-to-October precipitation at selected stations in and near the Mesilla Valley...... 9 5. Annual discharge of the Rio Grande at Leasburg and El Paso Narrows, and depletion of Rio Grande discharge.... 12 6. Distribution of hydraulic conductivity with depth for the upper, middle, and lower hydrostratigraphic units of the Santa Fe Group...... 14

IV

001109 L FIGURES--Continued Page Figure 7. Diagram showing interactions between ground water and surface water in the Mesilla Valley...... 17 8. Graph showing estimate of net irrigation flux in the Mesilla Valley, 1915-85...... 19 9. Graph showing estimated net ground-water withdrawal rates for nonirrigation uses in the Mesilla Valley...... 23 10. Map showing model grid...... 27 11. Diagrammatic sections along row 22 and column 17 showing layer thicknesses and relation between hydrostratigraphic units and layers...... 28 12-16. Maps showing: 12. Hydraulic conductivity assigned to model layer 1, the top layer...... 30 13. Transmissivity assigned to model layer 2...... 31 14. Transmissivity assigned to model layer 3...... 32 15. Transmissivity assigned to model layer 4...... 33 16. Recharge, underflow, and evapotranspiration boundaries for layer 1, steady-state simulation...... 39 17. Graphs showing major basinwide flow rates...... 40 18. Map showing model-derived evapotranspiration from nonirrigated lands for 1975 and area of net irrigation flux...... 43 19. Graph showing relation of annual surface-water depletions calculated from measured discharges to depletions calculated from model-derived discharges ...... 45 20. Graph showing relation of cumulative surface-water depletions calculated from measured discharges to cumulative depletions calculated from model-derived discharges...... 46 21. Hydrographs showing measured and model-derived drain discharges...... 48 22. Map showing measured hydraulic heads and model-derived steady-state potentiometric surface, layer 1...... 51

v a3

001110 FIGURES--Concluded Page Figure 23. Map showing measured hydraulic heads and model-derived potentiometric surface for 1975-76, layer 1...... 52 24. Map showing measured hydraulic heads and model-derived potentiometric surface for 1984-85, layer 1...... 53 25. Hydrographs showing measured and model-derived hydraulic heads...... 55 26. Graphs showing effect of changes in diffusivity on the source of water for nonirrigation withdrawals...... 59

TABLES Table 1. Estimated values of hydraulic conductivity of the Santa Fe Group...... 69 2. Values used for estimating net irrigation flux...... 72 3. Thicknesses of hydrostratigraphic units assigned to each model layer, in feet...... 77 4. Specified inflow to river reaches by stress period...... 136 5. Schedule of nonagricultural ground-water withdrawal specified in the model...... 137 6. Differences between measured and model-derived hydraulic heads...... 145 7. Average differences, in feet, between model-derived and measured hydraulic heads for the standard and each sensitivity test...... 151

vi

001111 I SIMULATION OF GROUND-WATER FLOW IN THE MESILLA BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS SUPPLEMENT TO OPEN-FILE REPORT 88-305 By Peter F. Frenzel ABSTRACT The Santa Fe Group of Tertiary age and flood-plain alluvium constitute the major aquifer of the Mesilla Basin. The lateral extent and depth of the ground-water system are defined by bedrock that has much smaller values of hydraulic conductivity than those of the flood-plain alluvium and deposits of the Santa Fe Group. Most flow into and out of the ground-water system occurs at or near land surface in the Mesilla Valley and is the result of a complex interaction of the river, drains, canals, evapotranspiration, and water withdrawals from wells. However, a relatively small amount of recharge results from torrential surface runoff, mainly near the mountain fronts. Anticipated ground-water withdrawals in the Mesilla Basin may reduce flow in the Rio Grande and thus reduce the quantity of water that is available to downstream users. A previous model (Frenzel, P.P., and Kaehler, C.A., 1990, Geohydrology and simulation of ground-water flow in the Mesilla Basin, Dona Ana County, New Mexico, and El Paso County, Texas, with a section on Water quality and geochemistry by S.K. Anderholm: U.S. Geological Survey Open-File Report 88-305; also to be available as U.S. Geological Survey Professional Paper 1407-C, in press) was revised to assess the effects of existing ground- water withdrawals on flow in the Rio Grande and to provide a tool for the assessment of the effects of future ground-water withdrawals. The revisions included a 10-year extension, from 1975 through 1985, of the original simulation period, a reduction i.n the simulated thickness of Santa Fe Group deposits based on recent geologic interpretations, and minor changes in simulated recharge and evapotranspiration based on additional data.

001112 2,000,000 2,600 1,800,000 2,400 O a 1,600.000 2.200 O CilOl 2,000 K 1,400.000 11en1 1,800 o. jjj 1,200,000 uIUi It 1,600 111 1,400 O O 1,000,000 3m 1,200 zO >>r 800.000 1.000 ouf 600,000 800 c u 400,000 600 e5o 400 200,000 200 0 1915 1925 1935 1945 1955 1965 1975 1985 Figure 5.--Annual discharge of the Rio Grande at Leasburg and El Paso Narrows, and depletion of Rio Grande discharge.

by consolidated bedrock units that are generally much less permeable than the basin-fill sediments of the Santa Fe Group and flood-plain alluvium. The Santa Fe Group of Tertiary age and flood-plain alluvium constitute the major aquifer. Frenzel and Kaehler (1990, p. 19-29) described the bedrock, Santa Fe Group, and flood-plain alluvium based on the geologic literature of the late 1970's and early 1980's. Hydrogeology of the Basin-fill Deposits Since the report of Frenzel and Kaehler (1990), the description of the subsurface geology of the basin has been expanded by Hawley and Lozinsky (written commun; , 1988) to include three "hydrostfatigraphic" units of the Santa Fe Groups The lower unit is mainly composed of uniform fine sand, whereas the middle and upper units are lenticular and with grain sizes ranging from clay to gravel. The lower hydrostratigraphic unit is about? 600 feet thick, ranging from 400 to about 1,000 feet in thickness where it Is fully penetrated by wells (Hawley and Lozinsky, written commun., 1988). Because the lower unit is easily distinguishable from the middle unit on electric logs (Hawley and Lozinsky, written commun., 1988), the depth of the base of the Santa Fe Group can be estimated to within a few hundred feet using wells that do not fully penetrate the lower unit. The maximum thickness of the Santa Fe Group is now considered to be about 2,500 feet, much less than the 3,800 feet that it was previously thought to be (Frenzel and Kaehler, 1990, p. 32). 12

001113 The division of the Santa Fe Group into three hydrostratigraphic units facilitates the assignment of aquifer properties on the basis of stratigraphy instead of strictly on the basis of depth. Although the lower unit consists of more uniform sand, cementation may cause its horizontal hydraulic conductivity to be less than that of the other two units. The middle hydrostratigraphic unit may be somewhat less permeable than the upper unit on the basis of grain size and degree of cementation. The upper hydrostratigraphic unit is saturated mainly in the northern part of the basin and may be the most permeable on the basis of grain size and relative lack of cementation. Horizontal-to-vertical anisotropy is probably greatest in the middle and upper units because of lenticularity (Hawley and Lozinsky, written commun., 1988). Each estimated hydraulic conductivity in table 1 (tables are in back of the report) was assigned to one of the three hydrostratigraphic units on the basis of the depth tested. The depths of the hydrostratigraphic units at each well site were estimated from plates 16 and 17 of Hawley and Lozinsky (written commun., 1988). Most of the estimated values of hydraulic conductivity in table 1 are from table 1 of Frenzel and Kaehler (1990). Additional values were estimated from values of transmissivity divided by open intervals reported in references given in table 1. The relation of hydraulic conductivity with depth that had been apparent in figure 13 of Frenzel and Kaehler (1990) was no longer apparent (fig. 6A and 6C) for the upper and lower hydrostratigraphic units of the Santa Fe Group. However, an inverse relation of hydraulic conductivity with depth was still apparent in figure 6B for the middle hydrostratigraphic unit. For the lower unit, estimated values of hydraulic conductivity given in table 1 range from 1 to 34 feet per day. Of 12 values, the lower quartile is between 2 and 3, the middle quartile (median) is between 11 and 14, and the upper quartile is 17 feet per day. For the middle unit, estimated hydraulic conductivity ranges from 1 to 100 feet per day (table 1). Of 38 values, the lower quartile is 5, the middle quartile (median) is between 13 and 14, and the upper quartile is 25 feet per day. However, because of the apparent inverse correlation between hydraulic conductivity and depth (fig. 6B), it may be reasonable to divide these data on the basis of depth. Estimated values of hydraulic conductivity for the middle hydrostratigraphic unit were divided into two groups on the basis of depth below the water table (table 1). Estimated hydraulic conductivity for depths between 600 and 1,210 feet ranges from 1 to 29 feet per day. Of 18 values, the lower quartile is 4, the middle quartile (median) is between 8 and 9, and the upper quartile is 14 feet per day. Estimated hydraulic conductivity for depths shallower than 600 feet ranges from 2 to 100 feet per day. Of 20 values, the lower quartile is between 10 and 12, the middle quartile is 24, and the upper quartile is between 35 and 36 feet per day. For the upper unit, estimated hydraulic conductivity ranges from 2 to 68 feet per day (table 1). Of 23 values, the lower quartile is between 10 and 12, the middle quartile is 25, and the upper quartile is 47 feet per day.

13

001114 !^'!ll'»«»«i!l^^

A. UPPER HYDR01TRATIORAPHIC UNIT B. IBIVI'k.K rlTUnV9 1 NAI lunMrmt* wnl I • too ' 1 ' ' %HI > ' 1 ' t O' 1 ' 1 ' I ' ' ' -200 -300 •0° o • ' -400•o -too o• o oo o %° -too i O O 0 O : .700 0 O O •too 'o •000 o •t ,000 o • 1.100 % -1 .200 • 1,900 : 0 10 20 SO 40 SO 60 70 C 10 10 aO 40 SO tO 70 10 tO 10 HYDRAULIC CONDUCTIVITY, IN FEET FER DAY HYDRAULIC CONDUCTIVITY, IN FEET FER DAY

C. LOWIR HYDRO*TRATIORAPHIC UNIT •19V O "'••''' •200 O -aoo •400 • -800 - -too -700 0 •too o oe •too o - ,000 • ,100 • • .200 . - .300 o • .400 0 - .600 ? • .too . -• TAA O . • . i . i 10 20 HYDRAULIC CONDUCTIVITY, IN FEET FIN DAY

Figure 6.-Distributk>n of hydraulic conductivity wtth depth for the upper, middle, and lower hydrostratigraphic units of the Santa Fe Group.

14

001115 r In the Las Cruces area, faults may cause a reduction in the overall transnissivity of the upper and middle hydrostratigraphic units of the Santa Fe Group. Plate 1 of Hawley (1984) shows many more faults in the Las Cruces area than in other parts of the Mesilla Basin. Faults may cause sand or gravel lenses to be juxtaposed against clay lenses, causing a reduction in transmissivity. Also, fault planes have been observed in the Las Cruces area that were more cemented than the rest of the formation (J.W. Hawley, New Mexico Bureau of Mines and Mineral Resources, oral commun., 1989). The flood-plain alluvium is about 4 miles wide along the Rio Grande, and is ouch more permeable than the Santa Fe Group deposits. Wilson and others (1981, pi. 11) reported values of transmissivity of 10,000 to 30,000 feet squared per day for the upper 150 feet of the aquifer, which is composed of it 80 feet of river alluvium overlying about 70 feet of the Santa Fe Group. If the 70-foot thickness of Santa Fe Group deposits is assumed to have a ;hydraulic conductivity of about 25 feet per day, it then has a transmissivity of 1,750 feet squared per day, and by subtraction, the transmissivity of the river alluvium is between 8,250 and 28,250 feet squared per day. Dividing transmissivity values by the 80-foot thickness yields hydraulic-conductivity values for the river alluvium ranging from about 100 to 350 feet per day. Under water-table conditions, specific yield may be about 0.2 as indicated by previous studies (Richardson and others, 1972, p. 86; Lizarraga, 1978, p. 29; Wilson and others, 1981, fig. 10). Unde6 r fully saturated conditions, the specific storage may be about 1 x 10- per foot of thickness. This value is common in sedimentary rocks (Lohman, 1972, p. 8) and accounts for expansion of water and some elastic matrix compression. Hydrogeologic Boundaries The Mesilla Basin (fig. 1) is generally surrounded by a pediment-like structure where the bedrock is relatively shallow between the basin and the surrounding mountains (Frenzel and Kaehler, 1990, p. 29-33). In the following discussion the pediment-like structure will be called a "pediment" to signify the general concept even though it is not a true pediment in all locations around the basin. Overlying the pediment are Santa Fe Group deposits. The saturated interval of these deposits is thin relative to the saturated thickness of Santa Fe Group deposits within the basin. A small quantity of water probably enters the Mesilla Basin around its ^boundaries. Underflow into the basin from the Santa Fe Group deposits jj^>verlying the pediments probably occurs although it is probably small compared "to the quantity of water involved in the interaction of ground water with jurface water near the axis of the basin (Frenzel and Kaehler, 1990, p. 29). ast mountain-front recharge probably enters the basin as underflow from Santa Group deposits overlying the pediments. A much smaller amount of water may nter the basin from the bedrock surrounding the basin. A small quantity of water also enters the basin as underflow in the river Lluvium near Radium Springs and a similarly small quantity, estimated by Uchter (1905, p. 9-13) to be 0.1 cubic foot per second, leaves the basin in river alluvium in El Paso Narrows. These quantities are small because of »e small cross-sectional area of the river alluvium. 15

001116 SIMULATION Of 6KOVND-WATER HOW IN THE MESILLA BASIN, DOHA AHA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS

WATER

U.S. GEOLOGICAL SURVEY Open-File Report 88-305 r^

001117 GEOHYDROLOGYAND SIMULATION OF GROUND-WATER FLO WIN THE MESILLA BASIN, DONA ANA COUNTY, NEW MEXICO, AND EL PASO COUNTY, TEXAS By Peter F. Frenzel and Charles A. Kaehler

With a section on WATER QUALITY AMD GEOCHEMISTRY By Scott K. Anderholm

U.S. GEOLOGICAL SURVEY Open-File Report 88-305

Albuquerque, New Mexico 1990

001118 CONTENTS Page Abstract ...... 1 Introduction ...... 3 Purpose and scope ...... 5 Previous investigations ...... 5 Well-numbering systems ...... 6 Acknowledgments ...... 7 Description of the Mesilla Basin ...... 9 Physical features ...... 9 Climate ...... 11 Population, industry, and agriculture ...... 11 Surface-water system ...... 14 Geohydrology ...... 19 Geologic units and their water-bearing properties ...... 19 Igneous-intrusive and metamorphic rocks ...... 19 Paleozoic and Mesozoic sedimentary rocks ...... 22 Lower Tertiary sedimentary and volcanic rocks ...... 22 Santa Fe Group ...... 23 Post-Santa Fe Group deposits ...... 28 Ground-water flow system ...... 29 Ground-water/surface-water relation ...... 34 Net irrigation flux ...... 37 Evapotranspiration from nonirrigated lands ...... 38 Stream seepage ...... 38 Ground-water withdrawals ...... 39 Ground-water recharge ...... 41 Summary of concepts ...... 44 Simulation of ground-water flow ...... 45 Description of the model ...... 46 Model grid ...... 46 Aquifer characteristics ...... 48 Hydraulic conductivity and transmissivity ...... 48 Specific yield and storage coefficients ...... 54

001119 CONTENTS - Continued Page Simulation of ground-water flow - Concluded Description of the model - Concluded Initial condition and time periods ...... 55 Boundary conditions ...... 56 No-flow boundary ...... 56 Recharge ...... 56 Underflow ...... 60 Mesilla Valley boundary ...... 60 Ground-water withdrawals ...... 68 Model adjustments ...... 70 System properties used for comparison ...... 70 Hydraulic heads ...... 70 Surface-water depletions ...... 77 Drain discharges ...... 83 System properties adjusted ...... 83 Recharge ...... 85 Hydraulic conductivity ...... 85 Specific yield ...... 85 Mesilla Valley boundary ...... 86 Model evaluation ...... 87 Sensitivity tests ...... 88 Sources of water withdrawn for nonirrigation uses ...... 94 Predictive capability ...... 100 Some possible ways to improve the model ...... 100 Additional model adjustment ...... 100 Shorter time increments ...... 101 Restructuring of the grid ...... 102 Simulation of inelastic beds ...... 102 Conclusions concerning the model ...... 102

vi

001120 CONTENTS - Concluded Page Water quality and geochemistry of the Mesilla Basin by Scott K. Anderholm ...... 104 Area west of the Mesilla Valley ...... 106 Mesilla Valley ...... 109 Area east of the Mesilla Valley ...... 112 Conclusions concerning basin geochemistry ...... 118 Summary ...... 120 References ...... 122 PLATES [In pocket] Plates 1-5. Maps showing: 1. Approximate water-level contours and gaging stations on drains, Mesilla Basin, New Mexico and Texas 2. Major faults and approximate saturated thickness of the basin fill, Mesilla Basin, New Mexico and Texas 3. Estimated hydraulic conductivity of the Santa Fe Group, Mesilla Basin, New Mexico 4. Estimated hydraulic conductivity of the shallow part of the aquifer (flood-plain alluvium and upper part of the Santa Fe Group) in the Mesilla Valley, New Mexico and Texas 5. Concentration of dissolved constituents for selected sites in the Mesilla Basin and adjacent areas, New Mexico and Texas

FIGURES Figure 1. Map showing study area boundary and basin divisions for the eastern part of the Southwest Alluvial Basins Regional Aquifer-System Analysis ...... 4 2. Diagram showing system of numbering wells in New Mexico ... 6 3. Diagram showing system of numbering wells in Texas ...... 8 4. Map showing location of the Mesilla Basin study area ...... 10 vii

001121 DONA ANA COUNTY

c (-D1

O 0O) O

:Irt

Uft)

Ol

001122 r

mIS-'

5 10 KILOMETERS EXPLANATION Q*1 I ALLUVIUM—Primarily flood-plain alluvium in the Rio Grande valley QUATERNARY - | Qab | BASIN-FILL SURFACE DEPOSITS--Thin discontinuous cover'of alluvial, eolian, and lacustrine deposits on the Santa Fe Group L! Qb 1 BASALT FLOWS AND CONES—Generally postdating the Santa Fe Group QUATERNARY AND 'yjn SANTA FE GROUP TERTIARY LOWER TERTIARY IpQTs] PRE-SANTA FE GROUP ROCKS--Includes undlfferentiated lower Tertiary, Mesozoic, TO PRECAMBRIAN ———Paleozoic, and Precambrian rocks CONTACT •• Q —"•" •••• FAULT — Dashed where approximately located or inferred; dotted where hidden; ____ D, downthrown side; U, upthrown side m BOUNDARY OF HESILLA BASIN--Approximate1y located Figure 10. --General geology of the Mesilla Basin and adjacent areas (modified from Wilson and others, 1981). 20

001123 WEST A .Mesllla Basin as defined for this study «.ooo- -

5,000 ' - MESILLA VALLEY FLOOD-PLAIN ALLUVI UN

3,000'- Santa Fe Group 2 .000' -

,000'- - 1 .000

SEA LEVEL SEA LEVEL 4 5 Ml LES Modified from Hawley (l98l», pi. 5) ' 012345 KILOMETERS .,, VERTICAL EXAGGERATION X 10 . '.-\ :' .' EXPLANATION J 4tt FAULT — Dashed where inferred. Arrows indicate direction of relative vertical movement

"in APPROXIMATE CONTACT BETWEEN SANTA FE GROUP AND UNDERLYING BEDROCK -i *•-, ^ POSSIBLE PATH OF UNDERFLOW INTO THE BASIN--X indicates flow in the Santa Fe Group; Y indicates flow partly through bedrock; T. indicates very deep flow *• POSSIBLE PATH OF FLOW FROM FLOOD-PLAIN ALLUVIUM ; Figure 11. — Generalized geohydrologic section of the northern Mesi 1 la Basin. Trace of section shown on plate 2.

001124 Santa Fe Group The Santa Fe Group of Tertiary and Quaternary age is a rock-stratigraphic unit, classified mainly on the basis of lithology and depositional environment rather than on fossils or time boundaries. The Santa Fe Group consists of unconsolidated to moderately consolidated sedimentary deposits, minor ash-fall volcaniclastics, and some volcanic rocks. In the study area, the lower limit of the Santa Fe Group generally is placed above the middle Tertiary (Oligocene) igneous and associated sedimentary rocks. The upper limit is placed at the surfaces of the youngest basin-fill deposits that predate Initial entrenchment of the present Rio Grande valley in middle Pleistocene time. These surfaces include the Jornada del Muerto, West Mesa, and Dona Ana jgeomorphic surfaces (Weir, 1965; King and others, 1971). The Santa Fe Group was deposited as the Mesilla Basin subsided relative to the bordering upland areas (fig. 11) during development of the Rio Grande rift. The early stages of basin filling were marked by closed intermontane basin (bolson) environments. The sediments include a variety of alluvial-fan, coalescent-fan, and piedmont deposits around the basin margins that grade into or intertongue with fine-grained lacustrine and alluvial basin-floor deposits (King and others, 1971; Hawley, 1984). (The term "basin floor" is used to describe the relatively flat land surface over the middle of the basin and should not be confused with the lower boundary of the ground-water basin.) The greater percentages of fine-grained sediment in the lower part of the Santa Fe Group and toward the southern end in the Mesilla Basin imply smaller permeability in the deep parts of the basin and the southern part of the West Mesa (Hawley, 1984). The ancestral Rio Grande through the Mesilla Basin probably developed in Pliocene time (Hawley, 1975, p. 146). Medium- to coarse-grained fluvial facies, with small amounts of fine-grained sediment, were deposited in the central part of the basin by axial streams, whereas alluvial-fan facies continued to be deposited at the margins. The surface of the West Mesa represents the highest level of basin fill deposited by distributaries of the ancestral Rio Grande prior to the start of downcutting of the present Rio Grande valley (Mesilla Valley) beginning in the late middle Pleistocene (Hawley, 1975, p. 146). An ancestral Rio Grande probably flowed through Fillmore Pass into the Tularosa and Hueco Basins during the late Pliocene to early Pleistocene (Belcher, 1975, p. 46-49). The lower part of the Santa Fe Group is not exposed in the Mesilla Basin, but as much as 3,500 feet of it is exposed in the Palomas Basin immediately to the north. Three units, from oldest to youngest, have been recognized within the lower part of the Santa Fe Group in the vicinity of the Mesilla Basin (fig. 12): an unnamed transitional unit composed mainly of conglomerate and sandstone; the Hayner Ranch Formation of Seager and others (1971), composed of conglomerate^sandstone, and volcanic-derived sediment; and the Rincon Valley Formation of Seager and others (1971), composed mainly of red clay plus some gypsum beds and thin sand layers. The lower part of the Santa Fe Group is overlain by the Fort Hancock Formation, which in turn is overlain by, or interfingers with, the Camp Rice Formation of Strain (1966, 1969). These formations comprise the upper part of the Santa Fe Group. 23

001125 RADIO- METRIC TIME UNIT SCALE VALLEY BASALTS CAMP RICE FORMATION -~ ______(Strain, 1966) FORT HANCOCK """ ~~ ~ — — FORMATION (Strain, 1966)

T3c F"tn^ f-i oz "~ o Z >- (I gj uT a: O UJ < 01 L. O —I 3C ID V 10- | < o^ w SELDEN BASALT ^ (Seager and others, 1971) in u. HAYNER (oJ O Hcc- 2 15H n. RANCH Uee.J o FORMATION (Seager and others, 1971) . 20— TRANSITIONAL UNIT UJ Q£ Q. UJ UPPER PART OF THURMAN FORMATION O 25 — (Kelley and Silver, 1952) U. UJ CO UVAS BASALTIC ANDESITE UJ o oUl 30- RHYOLITE §^ u g o.J si K TUFF rt" g Q-. Z o — a. 3 35- o 5 4-1 -J *J u-Jj ^O

PALM PARK FORMATION (Kelley and Silver, 1952) 40 EOCEN E Modified from Hawley, 1978, p. 239 Figure 12.--Strati graphic column of the Santa Fe Group in the Mesilla Basin and adjacent areas. 24

001126 The Fort Hancock Formation (Strain, 1966), exposed in the valley slopes at the southern end of the Mesilla Valley, is composed of alternating sands and lacustrine clays. The formation probably was deposited in a deltaic- lacustrine environment near the mouth of the ancestral Rio Grande in the middle to southern parts of the basin (King and Hawley, 1975, p. 201). The Camp Rice Formation (Strain, 1966) contains fluvial-facies sediment, composed of sand with lenses of gravel, silt, clay, and sandy clay, and alluvial-fan facies sediment, composed of sand, gravel, silt, and clay. The fluvial facies is the most extensive and contains most of the freshwater in the basin (Wilson and others, 1981, p. 38). Both facies and their intertonguing relation are visible in the side slopes of the Mesilla Valley. The distribution of facies of the Camp Rice Formation is not known in detail, but some information is available. King and others (1971, p. 20) reported that Las Cruces city wells produce from intertongued sand and gravel, with only minor amounts of silt and clay of the alluvial-fan and fluvial facies. New Mexico State University wells are completed in both the fluvial and alluvial-fan facies. The Camp Rice Formation on the eastern side of Mesilla Valley from about Mesquite to south of Anthony consists of sandy clay and clay instead of proportionately more sand than clay, as is typically found beneath the center and western side of the Mesilla Valley (Wilson and others, 1981, p. 39). J.W. Hawley (New Mexico Bureau of Mines and Mineral Resources, oral commun., 1983) reported that the ASARCO well (25S.01E.16.114) may penetrate more than 1,600 feet of the Camp Rice Formation. Wilson and others (1981, p. 38) reported more than 1,300 feet of Camp Rice at test hole 23S.1E.13.411 in Las Cruces and 1,932 feet in test hole 25S.2E.3.244 near Mesquite. Wells generally do not produce water from the full thickness of the aquifer. A City of El Paso well field that extends several miles northward from the town of Canutillo (pi. 1) produces water from three production zones described by Leggat and others (1962). The shallow production zone is primarily comprised of flood-plain alluvium to a depth of at least 90 feet, though the production zone extends into the Santa Fe Group to depths of ISO- 200 feet. The medium-depth production zone (all Santa Fe Group) contains alternating beds of sand to sand and gravel, similar to fluvial-facies sediment, and clay to sandy clay, similar to clay-facies material from the Palomas and Rincon Valleys (King and others, 1971, p. 21). The medium zone is 160-450 feet thick. The deep production zone (all Santa Fe Group) consists of a uniform fine-grained brown sand with almost no clay, which is 500 to possibly more than 1,000 feet thick (Leggat and others, 1962, p. 10-13). In general, the intervals below land surface occupied by each production zone are 0-200 feet for the shallow; 200-600 feet for the medium; and 600-1,350 feet for the deep zone. The characteristically fine grained sand of the deep production zone at the Canutillo well field has not been recognized west of the flood plain or north of Berino (J.W. Hawley, New Mexico Bureau of Mines and Mineral Resources, oral commun., 1981).

25

001127 The Santa Fe Group occurs beneath and to the west of the valley. It apparently decreases from about 3,800 feet in thickness in the downfaulted block between the East Robledo and Fitzgerald faults (pi. 2) to about 1,100 feet near the International Boundary about 40 miles to the south. The thickness of basin fill (pi. 2) was determined from data from deep wells, gravity profiles (Birch, 1980), a seismic profile (Bans Ackermann, U.S. Geological Survey, written commun., 1980), and vertical electrical-resistivity sounding profiles (Wilson and others, 1981, pi. 2). A study of well logs by King and others (1971) showed a progressive decrease in grain size from north to south and few coarse gravelly zones for the upper 1,330 feet of basin fill, but the sediments appear to have very good potential for development of ground water, according to King and Hawley (1975, p. 201). A decrease in hydraulic conductivity from north to south is not indicated by aquifer-test data from the three West Mesa wells listed by Wilson and others (1981, table 3). The general decrease in grain size probably represents an increase in the percentage of clayey layers or lenses toward the south. Significant amounts of interbedded volcanics in the upper part of the Santa Fe Group are not indicated by drillers' logs. An exception is the apparent subsurface intertonguing of Quaternary basalts with sediments of the upper part of the Santa Fe Group on the West Mesa near sec. 31, T. 23 S., R. 1 W. and near sec. 16, T. 26 S., R. 1 W. These basalts appear to be above the water table. Values of hydraulic conductivity for the Santa Fe Group were estimated from values of transmissivity reported by Wilson and others (1981, table 3) for specified intervals within each well. For this study, each hydraulic conductivity was estimated by dividing the transmissivity by the length of interval tested. This method of estimating hydraulic conductivity yields apparent values that generally are greater than actual values because two- dimensional radial flow is assumed, whereas if a short interval of a very thick aquifer is tested, three-dimensional flow probably occurs. Another reason for the large estimates of conductivity may be the selection of the sandiest zones for testing (R.R. White, U.S. Geological Survey, oral commun., 1984). Several such tests were conducted at various depths at many of the sites (pi. 3). Variability of hydraulic conductivity with depth is apparent on plate 3 as well as in figure 13. The tests of intervals less than 600 feet below the water table yielded values of hydraulic conductivity that generally were about four times as great as those from tests of deeper intervals. Physical difficulties of testing tend to increase with depth. Such difficulties might be caused, for example, by a limitation of air-compressor capacity in an airlifting test and might be the source of an apparent decrease in hydraulic conductivity with depth. Nevertheless, the values in table 1 (tables are in the back of the report) were judged to be acceptable estimates. The median value was 22 feet per day for intervals shallower than 600 feet and 5 feet per day for deeper intervals. For the same intervals, the upper quartile was 43 and 14 and the lower quartile was 9 and 2 feet per day. 26

001128 A=8 B=22 C=43 1 1 i i | | i 'i II • 200 1. • « *t i!. • ~ .\1* - i. 1 •••!•. 400 -^ J^ 1 UI • bI.d .1 r• •% • '1' * . 600 T1 r i — i1 • — ___ — 1 * r1 hi M 1 U 1 i < 800 ", A is the lower quart! le of KU. hydraulic conductivity D (0 for indicated depth I ,000 • interval O • B is the median for z . indicated depth interval I ,200 . »1 C is the upper quart! le i for indicated depth U interval DO I ,400 X '• 0H. 1— — UQ I ,600 ———— B=5 ———— C=I4 'I ~ 1 ,800 I I 1 1 i 1 1 I II 20 40 eo 80 HYDRAULIC CONDUCTIVITY, IN FEET PER DAY

Figure 13-—Distribution of hydraulic conductivity with depth for the Santa Fe Group.

27

001129 Post-Santa Fe Group Deposits After deposition of the Santa Fe Group, there were three major episodes of incision of the Rio Grande, each followed by partial backfilling of alluvium. Thin alluvial and eolian deposits (generally less than 25 feet) cover much of the West Mesa surface, and alluvial deposits are present on the piedmont slopes adjacent to the upland areas (Hawley, 1975, p. 147). Of these deposits, only the youngest alluvial-fill sequence, consisting of the flood- plain alluvium (figs. 10 and 11) of the Rio Grande as well as interf ingering alluvial-fan deposits of tributary arroyos, constitutes an aquifer. The other deposits all "appear * * * to be above the water table" (King and Hawley, 1975, p. 202). The Rio Grande flood-plain alluvium, generally about 80 feet thick, has a thick basal channel sand and gravel unit overlain by finer grained, sand-to-clay flood-plain deposits (King and Hawley, 1975, p. 202). The alluvium generally is very permeable. Values of hydraulic conductivity estimated from specific capacities of irrigation wells were 200 or more feet per day in places. Most irrigation wells in the valley are from 70 to 200 feet deep (Wilson and others, 1981, table 2), and many obtain water from both the flood-plain alluvium and the underlying Santa Fe Group (King and Hawley, 1975, p. 202). The open interval of most irrigation wells is not known, but Wilson and others (1981, page 82) described the construction of irrigation wells generally as having slotted casing "from several tens of feet below the water table to the bottom of the hole." The hydraulic conductivity (pi. 4) of the shallow part of the aquifer in the Mesilla Valley (flood-plain alluvium and upper part of the Santa Fe Group) was estimated by analysis of the specific capacities of 72 shallow wells described by Wilson and others (1981, table 2). The wells ranged in depth from 65 to 350 feet with a median depth of 133 feet. The bottoms of most of the wells probably were in the Santa Fe Group. The specific capacities of these wells ranged from 10 to about 200 gallons per minute per foot of drawdown and had a median of 50 gallons per minute per foot. The hydraulic conductivity, in feet per day, of the saturated interval of the aquifer penetrated by each well was estimated to be 170 times the specific capacity divided by the interval of the well (feet) open to the aquifer. The conversion factor is from Walton (1962, fig. 6), based on the assumptions of an 8-hour test duration (Wilson and others, 1981, p. 43) and occurrence of unconfined conditions. The conversion factor could have been as small as 133 for a median specific-capacity well if a test duration of 1 hour had been assumed or as large as 186 if a 24-hour test duration had been assumed (Walton, 1962, figs. 4 and 5). The interval of the well open to the aquifer was assumed to be either (a) the entire distance between the water table and the bottom of the well, or (b) 80 percent of that distance. Assumption (a) probably overestimates the length of well open to the aquifer, especially in the case of the deep wells, and thus may cause estimates of hydraulic conductivity to be too small. Assumption (b) might be more consistent with the construction of the wells in that they are not entirely open to the aquifer. However, that assumption does 28

001130 not account for three-dimensional radial flow (due to some vertical flow within the aquifer toward the well openings), so it may cause estimates of hydraulic conductivity to be too great. Estimates of hydraulic conductivity shown in figure 14 and table 2 were estimated under assumption (a). The harmonic mean (50 feet per day) of the estimates of hydraulic conductivity (fig. 14) may be an appropriate value for the overall basinwide hydraulic conductivity, but the arithmetic mean (93 feet per day) may also be a reasonable value. If the harmonic mean, derived under assumption (a), were reduced by the factor 133/170, accounting for the possibility that the tests were shorter than assumed, the resulting value of 40 feet per day would be a reasonable minimum. If the greater arithmetic mean, derived under assumption (b), were increased by the factor 187/170, accounting for the possibility that the tests were longer than assumed, the resulting value of 130 feet per day would be a reasonable maximum. The western part of the West Mesa surface is capped by the extensive Potrillo basalt field of Quaternary age (Hoffer, 1976). The eastern part of the basalt flows in the areas of Kilbourne Hole and Hunt's Hole overlies Santa Fe Group sediments, but the volcanic rocks of the West Potrillo Mountains may be underlain by Tertiary and older bedrock units (King and others, 1971, p. 23). On the eastern side of the West Mesa adjacent to the central Mesilla Valley, the Santo Tomas-Black Mountain basalts (Hoffer, 1971) are present. In total, basalt flows cover an area of at least 350 square miles. The effect of these surfaces on ground-water recharge was not studied. Approximately 15 wells in the basalt-flow region are shown on a water- table map by King and others (1971, pi. 1). Some of the wells obtain water from the underlying Santa Fe Group, whereas others close to the center of the West Potrillo Mountains may obtain water from Tertiary volcanics. There is little subsurface information available for this region.

Ground-Water Flow System The base and lateral boundaries of the ground-water flow system are considered to coincide with the bedrock-Santa Fe Group contact because of the permeability contrast between the two. However, thickness of the Santa Fe Group throughout the vicinity of the study area is highly variable. Therefore, the perimeter, or farthest lateral extent of the ground-water basin, was defined to be the smaller area shown in figure 4. The perimeter, for the most part, follows structural boundaries. Some ground-water underflow almost certainly crosses these boundaries. Such water probably affects the quality of ground water around the perimeter of the basin and at great depth, but the quantity probably is very small compared to the quantity involved in the interaction with surface waters near the axis of the basin. Bedrock of the Robledo Mountains, Selden Canyon, and the Dona Ana I Mountains bounds most of the northern end of the basin. There is probably only a small amount of underflow in Selden Canyon due to the small cross- 29

001131 r ratio of hydraulic conductance between the Santa Fe Group and bedrock. Similarly, even less flow would follow path Z, a still deeper and longer path. Paths X, Y, and Z are examples of an infinite number of stream lines that would be subparallel to each other. Probably the amount of underflow from the highland areas around the periphery of the basin is limited to no more than the amount of recharge in the highland areas. However, it is possible for water to follow a very deep path from areas where a regional divide is more distant than a water-table divide in the shallow rocks. The approximate direction of the horizontal component of ground-water movement can be inferred from the water-level contour map (pi. 1). The map, modified from Wilson and others (1981, pi. 9), was constructed using January 1976 water-level data; some older data were used in upland areas. The general direction of movement of ground water in the Mesilla Basin is southeastward. Ground water probably moves southward away from the Mesilla Valley near Las Cruces and back toward the valley in the southern part of the basin, which is consistent with hydraulic conductivity being greater in the Santa Fe Group than in underlying rocks. Ground water probably also moves vertically downward from the valley in the north. Upward movement of water in the southern end of the valley was indicated by increasing hydraulic head with depth (Leggat and others, 1962, p. 16). Upward flow probably persists except as altered by ground-water withdrawals. The water-table gradient beneath the West Mesa averages about 4.5 feet per mile, approximately the same as in the Mesilla Valley. Near the edges of the Mesilla Basin, water flows into the basin from the surrounding highlands, and the water-table gradient is steeper in those places due to less aquifer thickness and possibly smaller permeability. Near East Robledo fault, where the transmissivity of the basin fill changes greatly, it might be expected that the water-table contours would have a kink in them as shown by the dashed and queried 3,840-, 3,860-, and 3,880-foot contours on plate 1. Ground water moves horizontally toward well fields at Las Cruces and Canutillo from surrounding areas. The indistinct cone of depression in the Canutillo area (pi. 1) indicates that a large part of water pumped from the Cafiutillo well field may move vertically toward the production zones from nearby streams and irrigation-return flow from irrigated lands. Some water probably moves upward toward the lowermost production zone. In the Las Cruces area, ground water probably moves vertically toward the production zone. Wells generally do not produce from the full thickness of the aquifer.

33

001132 1 1 1 I i i I 1 1 i i 7 ' ?

1 •v * : tjt J , •. > ^1 ' - J r.-< ': - ,._ - r

NOTE: A DOUBLE LINE NO KATES TWO WEL LS 27 —— AT A GIVEN S TE ALL REPORTED Of 1 ESTIMATED PRODCTIOU N BEFORE 1351 VMS ASSUMED TO HA VE BEEN IN ROW 23. CC1LUMN 47, LAYER t FOR 1951 AND F( LLOWING YEARS, T HE PRODUCTION W« S ASSUMED TO HAV E BEEN DIVIDED EQUALLY BETWEEN THE WELLS THAT WE RE THOUGHT TO HA VE BEEN IN SERVI CE, AND FOR THIS PURPOSE, IT V AS ASSUMED THAT 23 OF THE WELLS IN ROW 29, COLUHrwIo LAYER 1 WERE IN SERVICE FOR « *7, 1951-65 THE ESTIMATED PRODUCTION OF WELLS THAT WERE IN SERVICE FOR PART OF A PUMPING PERIOD WAS SPREAD OVER THE ENTIRE PUMPING PERIOD

21.41.2 2« 1 1 1 1 1 1 1 1 1 1 1 1 1 1 , , , , « M 1141-47 1141-10 mi- 1114-57 1111- • IflX- • 1 Xl- IKJ. !•••- r> 1173- ll • 0 • • 3 w• fC 00 71 • 71 4 S 6 7 • S t 10 11 12 13 14 IS 16 Figure 30.—Estimated time of pumpage for wells in the Las Cruces well field.

69

001133 *** NHED, DRINKING HflTER BUREflU *** *** WflTER 3V3TEM INUEHTORV Sample[P]oints|[U]iolation*** s |[5]amples |[E]nforcrnent Select ion. jde lame flS CRLICE3 MLINICIPfiL URTER SYSTEM Resp. Party. Street...... District....: . fict/Inact....j ield Office. Begin Date...' City St Zip. Staff...... End Date.... Phone...... System Type.. Survey Date..] -DEC-95 Operator Source Type.. Service flrea.i Phone...... s iciencies ]iuner Type... Population, ,7900 tt Entry Pts. Source... Jurisdiction. tt Connects. 19512 tt Hells..... Storage.. Season Begin. tt Meters... 19512 tt Springs... Distrib.. Season End... flvg. Prod.. 16.51 ' tt Galleries.! | Treat rnt.. lent. Req.... Rate...... 5.4 | tt Streams, flsbestos... lent. Obt.... Storaae.... 15.956 tt Lakes.., Disinfection.! iornments !OTENTIHL PROBLEMS WITH SEHflGE LIFT 3TRTION5 WITHIN 50 FT. OF WELL tt3 iserted Modified 1 EPR Transfer- Char Mode: Replace Page 1 Count: #1

001134 HMED, DRINKING NflTER BUREflU *** WflTER SYSTEM INUEHTOR *** Sample [PbintsiPJ] iolat ions j[3]amples jtEMorcment Select ion jde 10807 (lame .flS CRLICES EflST MESfl WflTER SYSTEM Resp. Party.] :ITV OE LR3 CRLiCES Street..... '0 DRRWER CLC pistnct..... flct/Inact.... Field Office. Begin Date... City St Zip, End Date..... Phone... .055277852 System Type.. Survey Date.. Operator IERRV MflVFIELD source Type.. Service flrea. Phone... 3 Deficiencies puner Type... Population, tt Entry Pts. Source... purisdiction. tt Connects, tt Wells..... Storage.. Reason Begin, tt Meters... tt Springs... Distrib.. [Season End... flvg. Prod,. tt Galleries, Treatmt.. pert, Req.... Rate...... tt Streams... Rsbestos... pert, Obt.... Storage.... ti Lakes..... Disinfection. IELL HflS OPEN CESSPOOL 150 FT. h« iserted ^^^^1 bu ^^^| ModifieI9-JUL-9d . EPfl Transfer - Dates. U - Uiolations, or E - Enforcement v Char Hode: Replace Page 1 Count: 1

001135 COP/

TOTAL MONTHLY WATER REPORT WELL OPERATION AND WATER PRODUCTION

DATE: January 1994 D0520.DV559 asj^A —•»•—» Location A ^^ ^^"^-^-^ ^ ^ • 10 LOW Washington School LRG-430 -0- 18 Low Dona Ana Yard LRG-430-S-5 -0- 19 LOW Upper Griggs Tank LRG-430-S-6 6737040 20 Low Entrada Del Sol & Triviz LRG-430-S-7 17583552 21 Low Craig & Triviz LRG-430-S-8 18997650 22 High San Acacio & Triviz LRG-430-S-9 18252780 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah & Shannon LRG-430-S-11 14932800 25 High 1-25 & Villamora Dam LRG-430-S-13 6790770 26 Low Walnut & Nevada LRG-430-S-12 -0- 27 Low Walnut & Griggs LRG-430-S-14 -0- 28 Inter. Villamora Dam LRG-430-S-15 -0- 29 Low Valley & Hayner LRG-430-S-16 31341168 30 Low Union & Harrelson LRG-430-S-17 -0- 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesquite LRG-430-S-19 25977000 33 Inter. Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 -0- 36 High West Mesa Ind. Park LRG-430-S-22 2905440 37 High West Mesa Ind. Park LRG-430-S-22 1575000 38 High Idaho & Don Roser LRG-430-S-4 39033000 39 High Lennox & Temple LRG-430-S-27 34892100 40 Zone 1 East Mesa LRG-430-S-26 29153280 44 Low Missouri & Gladys LRG-430-S 13497300 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 -0- 55 Zone 2 Church Road LRG-517 117750 56 Zone 2 Church Road LRG-517-S 257400 57 High E. Lohman LRG-430-S-31 22320000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 -0- TOTALS 284,364,030

001136 TOTAL MONTHLY HATER REPORT WELL OPERATION AMD WATER PRODUCTION

DATE: February 1994 D0520.DV559

Zone Location Sao Number Totalizer 10 LOW Washington School LRG-430 -0- 18 LOW Dona Ana Yard LRG-430-S-5 2974860 19 LOW Upper Griggs Tank LRG-430-S-6 9485100 20 LOW Entrada Del Sol & Triviz LRG-430-S-7 20563776 21 Low Craig & Triviz LRG-430-S-8 28515690 22 High San Acacio & Triviz LRG-430-S-9 4770360 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Be 11 amah & Shannon LRG-430-S-11 16513440 25 High 1-25 & Vi 11 amor a Dam LRG-430-S-13 18115020 26 Low Walnut & Nevada LRG-430-S-12 10268610 27 Low Walnut & Griggs LRG-430-S-14 -0- 28 Inter . Villamora Dam LRG-430-S-15 -0- 29 Low Valley & Hayner LRG-430-S-16 17733168 30 Low Union & Harrelson LRG-430-S-17 -0- 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesquite LRG-430-S-19 -0- 33 Inter . Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 -0- 36 High West Mesa Ind. Park LRG-430-S-22 2703360 37 High West Mesa Ind. Park LRG-430-S-22 1463940 38 High Idaho & Don Roser LRG-430-S-4 36482820 39 High Lennox & Temple LRG-430-S-27 33553440 40 Zone 1 East Mesa LRG-430-S-26 29155200 44 Low Missouri & Gladys LRG-430-S 16015950 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 -0- 55 Zone 2 Church Road LRG-517 93900 56 Zone 2 Church Road LRG-517-S 189600 57 High E . Lohman LRG-430-S-31 20250000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 -0- TOTALS 268,848,234

001137 TOTAL MONTHLY WATER REPORT WELL OPERATION AMD WATER PRODUCTION

DATE: March 1994 D0520.DV559

J^JJ^p^^^ —•^««^ ••^IWM VP^^r** 8*0 ^^ ^^^ TTiir 10 LOW Washington School LRG-430 -0- 18 LOW Dona Ana Yard LRG-430-S-5 34183620 19 Low Upper Griggs Tank LRG-430-S-6 11393460 20 Low Entrada Del Sol & Triviz LRG-430-S-7 16430400 21 LOW Craig & Triviz LRG-430-S-8 14278950 22 High San Acacio & Triviz LRG-430-S-9 20867280 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah & Shannon LRG-430-S-11 22396800 25 High 1-25 & Villamora Dam LRG-430-S-13 32462010 26 Low Walnut & Nevada LRG-430-S-12 19645470 27 Low Walnut & Griggs LRG-430-S-14 -0- 28 Inter . Villamora Dam LRG-430-S-15 826740 29 Low Valley & Hayner LRG-430-S-16 3797930 30 Low Union & Harrelson LRG-430-S-17 15732000 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesquite LRG-430-S-19 -0- 33 Inter . Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 35186400 36 High West Mesa Ind. Park LRG-430-S-22 3453840 37 High West Mesa Ind. Park LRG-430-S-22 2016900 38 High Idaho & Don Roser LRG-430-S-4 45167760 39 High Lennox & Temple LRG-430-S-27 36981900 40 Zone 1 East Mesa LRG-430-S-26 32792640 44 Low Missouri & Gladys LRG-430-S 9947700 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 -0- 55 Zone 2 Church Road LRG-517 288300 56 Zone 2 Church Road LRG-517-S 231600 57 High E . Lohman LRG-430-S-31 20880000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 28224000 TOTALS 407,185,700

001138 TOTAL MONTHLY HATER REPORT WELL OPERATION AND WATER PRODUCTION

DATE: April 1994 D0520.DV559

S^^^^^UStt ——— Location Sao • ^^ ^^K .A. -^ ^ ^H.B_ 10 Low Washington School LRG-430 15958410 18 Low Dona Ana Yard LRG-430-S-5 34749000 19 Low Upper Griggs Tank LRG-430-S-6 19431360 20 Low Entrada Del Sol & Triviz LRG-430-S-7 21678912 21 Low Craig & Triviz LRG-430-S-8 15268680 22 High San Acacio & Triviz LRG-430-S-9 18132660 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah & Shannon LRG-430-S-11 21217920 25 High 1-25 & Villamora Dam LRG-430-S-13 21649950 26 Low Walnut & Nevada LRG-430-S-12 22617825 27 Low Walnut & Griggs LRG-430-S-14 2740800 28 Inter. Villamora Dam LRG-430-S-15 3180600 29 Low Valley & Hayner LRG-430-S-16 11988000 30 Low Union & Harrelson LRG-430-S-17 18834000 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesguite LRG-430-S-19 17887800 33 Inter. Dona Ana Road LRG-430-S-20 15104100 35 Low Frenger Park LRG-430-S-21 50299200 36 High West Mesa Ind. Park LRG-430-S-22 3972720 37 High West Mesa Ind. Park LRG-430-S-23 1980720 38 High Idaho & Don Roser LRG-430-S-4 44383020 39 High Lennox & Temple LRG-430-S-27 29680560 40 Zone 1 East Mesa LRG-430-S-26 33098880 44 Low Missouri & Gladys LRG-430-S 11818800 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 11550000 55 Zone 2 Church Road LRG-517 427500 56 Zone 2 Church Road LRG-517-S 176100 57 High E . Lohman LRG-430-S-31 20430000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 68227200 TOTALS 536,484,717

001139 TOTAL MONTHLY WATER REPORT WELL OPERATION AMD WATER PRODUCTION

DATE: May 1994 D0520.DV559

J^XAJB WTttir Location * -W ^^B^^BB^*^, 10 Low Washington School LRG-430 28988700 18 LOW Dona Ana Yard LRG-430-S-5 40137660 19 Low Upper Griggs Tank LRG-430-S-6 24700680 20 Low Entrada Del Sol & Triviz LRG-430-S-7 24808320 21 Low Craig & Triviz LRG-430-S-8 25686990 22 High San Acacio & Triviz LRG-430-S-9 20173020 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah & Shannon LRG-430-S-11 32838240 25 High 1-25 & Villamora Dam LRG-430-S-13 20049120 26 Low Walnut & Nevada LRG-430-S-12 23301210 27 Low Walnut & Griggs LRG-430-S-14 18349440 28 Inter . Villamora Dam LRG-430-S-15 -0- 29 Low Valley & Hayner LRG-430-S-16 36595152 30 Low Union & Harrelson LRG-430-S-17 10032000 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesquite LRG-430-S-19 23154600 33 Inter. Dona Ana Road LRG-430-S-20 24486000 35 LOW Frenger Park LRG-430-S-21 39542400 36 High West Mesa Ind. Park LRG-430-S-22 6597600 37 High West Mesa Ind. Park LRG-430-S-23 2825820 38 High Idaho & Don Roser LRG-430-S-4 49018200 39 High Lennox & Temple LRG-430-S-27 24026760 40 Zone 1 East Mesa LRG-430-S-26 39784320 44 Low Missouri & Gladys LRG-430-S 15855750 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 33000 55 Zone 2 Church Road LRG-517 688635 56 Zone 2 Church Road LRG-517-S 76800 57 High E . Lohman LRG-430-S-31 18000000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 50400000 TOTALS 600,150,417

001140 WELL TOTAOPERATIOL mammaN MID WATEWATER RPRODUCTIO REPORTN

DATBl June 1994 DOS20.OV559

JUBiBUK — •— — — Location ^ ^JT ^f^K-L-M- »^ m 10 Low Washington School LRG-430 27463800 18 Low Dona Ana Yard LRG-430-S-5 38874600 19 LOW Upper Griggs Tank LRG-430-S-6 33125220 20 Low Entrada Del Sol & Triviz LRG-430-S-7 36207936 21 Low Craig & Triviz LRG-430-S-8 36575910 22 High San Acacio & Triviz LRG-430-S-9 26485200 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah £ Shannon LRG-430-S-11 32582880 25 High 1-25 & Villamora Dam LRG-430-S-13 37570050 26 Low Walnut & Nevada LRG-430-S-12 27070920 27 Low Walnut & Griggs LRG-430-S-14 28188000 28 Inter. Villamora Dam LRG-430-S-15 32189940 29 Low Valley & Hayner LRG-430-S-16 43347312 30 Low Union & Harrelson LRG-430-S-17 43452000 31 Low Isaak & Valley LRG-430-S-18 35128800 32 Low Arizona & Mesquite LRG-430-S-19 30172800 33 Inter. Dona Ana Road LRG-430-S-20 23684100 35 Low Frenger Park LRG-430-S-21 49132800 36 High West Mesa Ind. Park LRG-430-S-22 7081680 37 High West Mesa Ind. Park LRG-430-S-23 3160800 38 High Idaho & Don Roser LRG-430-S-4 44767800 39 High Lennox & Temple LRG-430-S-27 33904440 40 Zone 1 East Mesa LRG-430-S-26 38867520 44 Low Missouri & Gladys LRG-430-S 26104050 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 19230000 55 Zone 2 Church Road LRG-517 678450 56 Zone 2 Church Road LRG-517-S 305400 57 High E. Lohman LRG-430-S-31 20880000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 62496000 TOTALS 838,728,408

001141 TOTAL MONTHLY WATER REPORT WELL OPERATION AND WATER PRODUCTION

DATE! July 1994 D0520.DV559

Wt *P ^U «fc mg-u^*^ ***»»»«• «P A^TAB flao MU * *f ww» A A • WA 10 LOW Washington School LRG-430 28454400 18 Low Dona Ana Yard LRG-430-S-5 40170600 19 Low Upper Griggs Tank LRG-430-S-6 30250800 20 Low Entrada Del Sol & Triviz LRG-430-S-7 22308480 21 Low Craig & Triviz LRG-430-S-8 35815500 22 High San Acacio & Triviz LRG-430-S-9 24494400 23 High 1-25 & 70/80 LRG-430-S-10 19423050 24 High Bellamah & Shaimon LRG-430-S-11 34459200 25 High 1-25 & Villamora Dam LRG-430-S-13 43948800 26 Low Walnut & Nevada LRG-430-S-12 22506900 27 Low Walnut & Griggs LRG-430-S-14 27960000 28 Inter . Villamora Dam LRG-430-S-15 31973400 29 Low Valley & Hayner LRG-430-S-16 39048480 30 Low Union & Harrelson LRG-430-S-17 44430000 31 Low Isaak & Valley LRG-430-S-18 53208000 32 Low Arizona & Mesguite LRG-430-S-19 30991800 33 Inter. Dona Ana Road LRG-430-S-20 24248400 35 Low Frenger Park LRG-430-S-21 52855200 36 High West Mesa Ind. Park LRG-430-S-22 7368000 37 High West Mesa Ind. Park LRG-430-S-23 2910600 38 High Idaho & Don Roser LRG-430-S-4 44404800 39 High Lennox & Temple LRG-430-S-27 31039200 40 Zone 1 East Mesa LRG-430-S-26 43468800 44 Low Missouri & Gladys LRG-430-S 22234500 45 High Roadrunner Pkwy. LRG-430-S-2 3477000 54 High COE Dam LRG-430-S-25 22320000 55 Zone 2 Church Road LRG-517 469650 56 Zone 2 Church Road LRG-517-S 415200 57 High E . Lohman LRG-430-S-31 22320000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 65049600 TOTALS 872,024,760

001142 TOTAL MONTHLY WATER REPORT WELL OPERATION AND WATER PRODUCTION

DATE: August 1994 D0520.DV559

Well Zone Location Sao Number Totalizer 10 LOW Washington School LRG-430 22308000 18 LOW Dona Ana Yard LRG-430-S-5 27442530 19 LOW Upper Griggs Tank LRG-430-S-6 23142000 20 LOW Entrada Del Sol & Triviz LRG-430-S-7 8202600 21 Low Craig & Triviz LRG-430-S-8 39580200 22 High San Acacio & Triviz LRG-430-S-9 16465800 23 High 1-25 & 70/80 LRG-430-S-10 12736350 24 High Bellamah & Shannon LRG-430-S-11 30664980 25 High 1-25 & Villamora Dam LRG-430-S-13 33100200 26 Low Walnut & Nevada LRG-430-S-12 18587550 27 Low Walnut & Griggs LRG-430-S-14 26901960 28 Inter. Villamora Dam LRG-430-S-15 27673770 29 Low Valley & Hayner LRG-430-S-16 35672400 30 Low Union & Harrelson LRG-430-S-17 42596100 , 31 Low Isaak & Valley LRG-430-S-18 41125500 32 Low Arizona & Mesquite LRG-430-S-19 26763750 33 Inter. Dona Ana Road LRG-430-S-20 17856000 35 Low Frenger Park LRG-430-S-21 38917800 36 High West Mesa Ind. Park LRG-430-S-22 9247500 37 High West Mesa Ind. Park LRG-430-S-23 1654200 38 High Idaho & Don Roser LRG-430-S-4 45153600 39 High Lennox & Temple LRG-430-S-27 24048000 40 Zone 1 East Mesa LRG-430-S-26 42115200 41 Zone 1 East Mesa LRG-430-S-28 3435300 44 Low Missouri & Gladys LRG-430-S 22070400 45 High Roadrunner Pkwy. LRG-430-S-2 8481600 54 High COE Dam LRG-430-S-25 22110000 55 Zone 2 Church Road LRG-517 259650 56 Zone 2 Church Road LRG-517-S 461550 57 High E . Lohman LRG-430-S-31 20088000 58 LOW Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 33906870 TOTALS 722,769,360

001143 TOTAL MONTHLY WATER REPORT WELL OPERATION AMD WATER PRODUCTION

DATE: September 1994 D0520.DV559

gone Location Totalizer 10 Low Washington School LRG-430 21600000 18 Low Dona Ana Yard LRG-430-S-5 302580 19 Low Upper Griggs Tank LRG-430-S-6 19996950 20 Low Entrada Del Sol & Triviz LRG-430-S-7 6134400 21 Low Craig & Triviz LRG-430-S-8 41553600 22 High San Acacio & Triviz LRG-430-S-9 12632100 23 High 1-25 & 70/80 LRG-430-S-10 6477450 24 High Bellamah & Shannon LRG-430-S-11 29220120 25 High 1-25 £ Villamora Dam LRG-430-S-13 33509700 26 Low Walnut & Nevada LRG-430-S-12 14946600 27 Low Walnut & Griggs LRG-430-S-14 28318320 28 Inter. Villamora Dam LRG-430-S-15 27065850 29 Low Valley & Hayner LRG-430-S-16 37130400 30 Low Union & Harrelson LRG-430-S-17 39295800 31 Low Isaak & Valley LRG-430-S-18 1368000 32 Low Arizona & Hesguite LRG-430-S-19 13537500 33 Inter. Dona Ana Road LRG-430-S-20 9384000 35 Low Frenger Park LRG-430-S-21 32427000 36 High West Mesa Ind. Park LRG-430-S-22 7959600 37 High West Mesa Ind. Park LRG-430-S-23 2388600 38 High Idaho & Don Roser LRG-430-S-4 38184600 39 High Lennox & Temple LRG-430-S-27 7483200 40 Zone 1 East Mesa LRG-430-S-26 34857600 41 Zone 1 East Mesa LRG-430-S-28 -0- 44 Low Missouri & Gladys LRG-430-S 9672000 45 High Roadrunner Fkwy. LRG-430-S-2 7660800 54 High COE Dam LRG-430-S-25 21600000 55 Zone 2 Church Road LRG-517 132570 56 Zone 2 Church Road LRG-517-S 441600 57 High E. Lohman LRG-430-S-31 19440000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 16953900 TOTALS 541,674,860

001144 TOTAL MONTHLY WATER REPORT WELL OPERATION AND WATER PRODUCTION

DATE: October 1994 D0520.DV559

Wall gone Location Totalizer 10 Low Washington School LRG-430 10419000 18 Low Dona Ana Yard LRG-430-S-5 -0- 19 Low Upper Griggs Tank LRG-430-S-6 14511600 20 Low Entrada Del Sol & Triviz LRG-430-S-7 621000 21 Low Craig & Triviz LRG-430-S-8 23053800 22 High San Acacio & Triviz LRG-430-S-9 12842700 23 High 1-25 & 70/80 LRG-430-S-10 24161400 24 High Bellamah & Shannon LRG-43C-S-11 30520080 25 High 1-25 & Villamora Dan LRG-430-S-13 ' 15372000 26 Low Walnut & Nevada LRG-430-S-12 5098200 27 Low Walnut & Griggs LRG-430-S-14 14754120 28 Inter. Villamora Dan LRG-430-S-15 19256760 29 Low Valley & Hayner LRG-430-S-16 3660600 30 Low Union & Harrelson LRG-430-S-17 41325000 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesguite LRG-430-S-19 -0- 33 Inter. Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 34506000 36 High West Mesa Ind. Park LRG-430-S-22 5448600 37 High West Mesa Ind. Park LRG-430-S-23 2095200 38 High Idaho & Don Roser LRG-430-S-4 36307800 39 High Lennox & Temple LRG-430-S-27 12715200 40 Zone 1 East Mesa LRG-430-S-26 28195200 41 Zone 1 East Mesa 'LRG-430-S-28 7494300 44 Low Missouri & Gladys LRG-430-S 9864000 45 High Roadrunner Pkwy. LRG-430-S-2 3887400 54 High COE Dam LRG-430-S-25 10230000 55 Zone 2 Church Road LRG-517 102750 56 Zone 2 Church Road LRG-517-S 366300 57 High E. Lohman LRG-430-S-31 20088000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 20088000 TOTALS 406/985,010

001145 TOTAL MONTHLY WATER REPORT WELL OPERATION AMD WATER PRODUCTION

DATE: November 1994 D0520.DV559

Well gone Location Totalizer 10 Low Washington School LRG-430 -0- 18 Low Dona Ana Yard LRG-430-S-5 -0- 19 Low Upper Griggs Tank LRG-430-S-6 5009895 20 Low Entrada Del Sol & Triviz LRG-430-S-7 750600 21 Low Craig & Triviz LRG-430-S-8 35434740 22 High San Acacio & Triviz LRG-430-S-9 7855770 23 High 1-25 & 70/80 LRG-430-S-10 32870850 24 High Bellamah & Shannon LRG-430-S-11 24019452 25 High 1-25 & Villamora Dam LRG-430-S-13 14747040 26 Low Walnut & Nevada LRG-430-S-12 8700 WTo 27 Low Walnut & Griggs LRG-430-S-14 -0- 28 Inter. Villamora Dam LRG-430-S-15 4023000 29 Low Valley & Hayner LRG-430-S-16 34198200 30 Low Union & Harrelson LRG-430-S-17 40994400 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesguite LRG-430-S-19 -0- 33 Inter. Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 37584000 36 High West Mesa Ind. Park LRG-430-S-22 5835510 37 High West Mesa Ind. Park LRG-430-S-23 1829160 -38 High Idaho & Don Roser LRG-430-S-4 14209860 39 High Lennox & Temple LRG-430-S-27 12993600 40 Zone 1 East Mesa LRG-430-S-26 -0- 41 Zone 1 East Mesa LRG-430-S-28 30674160 44 Low Missouri & Gladys LRG-430-S 3795840 45 High Roadrunner Pkwy. LRG-430-S-2 -0- —54 High COE Dam LRG-430-S-25 -0- 55 Zone 2 Church Road LRG-517 96300 56 Zone 2 Church Road LRG-517-S 307050 57 High E. Lohman LRG-430-S-31 19440000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building k LRG-430-S-32 948600 TOTALS 327,626,727

001146 TOTAL MONTHLY WATER REPORT WELL OPERATIOH AMD WATER PRODUCTION

DATE: D«0«Mb«r 1993 D0520.DV559

WT W A J» ^UCJKK *«»»»«^» •• •*«•»•*• ^ ^ ^^»^^- ^^H-M- 10 Low Washington School LRG-430 -0- 18 Low Dona Ana Yard LRG-430-S-5 -0- 19 LOW Upper Griggs Tank LRG-430-S-6 15217200 20 Low Entrada Del Sol & Triviz LRG-430-S-7 13086720 21 Low Craig & Triviz LRG-430-S-8 18074700 22 High San Acacio & Triviz LRG-430-S-9 -0- 23 High 1-25 & 70/80 LRG-430-S-10 -0- 24 High Bellamah & Shannon LRG-430-S-11 15100800 25 High 1-25 & Villamora Dam LRG-430-S-13 18956700 26 Low Walnut & Nevada LRG-430-S-12 -0- 27 Low Walnut & Griggs LRG-430-S-14 -0- 28 Inter . Villamora Dam LRG-430-S-15 -0- 29 Low Valley & Hayner LRG-430-S-16 32056560 30 Low Union & Harrelson LRG-430-S-17 -0- 31 Low Isaak & Valley LRG-430-S-18 -0- 32 Low Arizona & Mesguite LRG-430-S-19 20689200 33 Inter. Dona Ana Road LRG-430-S-20 -0- 35 Low Frenger Park LRG-430-S-21 -0- 36 High West Mesa Ind. Park LRG-430-S-22 2942400 37 High West Mesa Ind. Park LRG-430-S-22 1591200 -38 High Idaho & Don Roser LRG-430-S-4 43612800 39 High Lennox & Temple LRG-430-S-27 37724400 40 Zone 1 East Mesa LRG-430-S-26 30787200 44 Low Missouri & Gladys LRG-430-S 10363500 45 High Roadrunner Pkwy. LRG-430-S-2 -0- 54 High COE Dam LRG-430-S-25 -0- 55 Zone 2 Church Road LRG-517 300600 56 Zone 2 Church Road LRG-517-S 145950 57 High E . Lohman LRG-430-S-31 20880000 58 Low Stern & Park Drain LRG-430-S-3 -0- 59 Low JU Building LRG-430-S-32 -0- TOTALS 281,529,930

001147 ovJ.\ d? >tiM& Ui

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