Section 7 MONUMENT VALLEY AREA

7.1 United States Environmental Protection Agency ABANDONED URANIUM MINES PROJECT Monument Valley Area OVERVIEW MAP

113° 112° 111° 110° 109° 108° 107° 3 8 ° ° 8 3 3

COLORADO 7

UTAH ° ° 7 3 ARIZONA NEW MEXICO # Kayenta# Shiprock

NAVAJO

Tuba City 3 6

# ° ° NATION 6 3

#Window Rock # Gallup ,-.40 Flagstaff # 3 5 ° ° 5

3 # Winslow # Holbrook 3 4 ° 113° 112° 111° 110° 109° 108° 107°

Aspen Spring Baby Rock Spring 8-44

Sand Spring Tsiah Spring

The Monument Valley area is located in northeastern Arizona and southeastern Utah. Some of the physiography of the area is shown above in photos taken by Glynn Alsup (USACE).

The overview map shown on the facing page provides the map extent boundary for the Monument Valley area maps presented in Section 7. Ten aerial radiation surveys were flown in the Monument Valley area: Baby Rocks Mesa, Cane Valley, Dennehotso, Double Arch Canyon, Mexican Hat, Monument Valley Park, Oljato, Shonto, Wetherill Mesa, and Agathla Peak.

Water samples from 31 sites were collected in the Monument Valley area.

7.2 111°00' 110°45' 110°30' 110°15' 110°00' 109°45' 109°30'

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U.S. Environmental Protection Agency MAP FEATURES OVERVIEW MAP ABANDONED URANIUM Map Extent Boundary 10 0 10 Miles MINES PROJECT Aerial Survey Boundary 4 10 0 10 Kilometers Monument Valley Area Scale 1:600,000

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U.S. Environmental Protection Agency 5 0 5 Miles ABANDONED URANIUM AERIAL RADIATION CONTOURS MINES PROJECT See facing page for legend GROSS COUNT 5 0 5 10 Kilometers 4 1:350,000 Monument Valley Area efexhyxih2 ‚exs w2 wyx wix„2†evvi‰2e‚ie wsxiƒ2€‚ytig„ ei‚sev2‚ehse„syx2gyx„y ‚ƒ2E2fsƒw „r2PIR

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U.S. Environmental Protection Agency

5 0 5 Miles ABANDONED URANIUM MAP FEATURES AERIAL RADIATION CONTOURS MINES PROJECT Aerial Survey Boundary BISMUTH 214 5 0 5 10 Kilometers 4 1:350,000 Monument Valley Area ABANDONED URANIUM MINES PROJECT MONUMENT VALLEY AREA

WATER SAMPLE INFORMATION

Longitude (DMS) Latitude (DMS) Map ID Sample ID Field Type Sample Name Elevation (ft) Sample Date Sample Time (W) (N) 1 KY980910OLS003 Spring Tse-li-chee-hateh Spring 109 50 40.450 37 1 12.07919 4531 10-Sep-98 2:37 PM 2 KY980910OLW004 Well Stockpile Well 109 51 54.831 36 56 10.0104 4802 10-Sep-98 10:45 AM 3 KY980910OLS002 Spring Kiishzhinii-be-toh Spring 109 51 58.602 36 55 36.3593 4804 10-Sep-98 12:01 PM 4 KY981012OLW012 Well Artesian Well 613 109 51 50.499 36 55 32.6430 4799 12-Oct-98 10:40 AM 5 KY980901DEW002 Wind Mill Tank 8T-519 109 46 23.957 36 55 24.8562 5055 01-Sep-98 11:32 AM 6 KY980901DEW001 Wind Mill Tank-East Of Chapter 109 48 29.801 36 53 54.5862 5140 01-Sep-98 10:13 AM 7 KY980910OLW005 Well Shallow Well-Adakai 109 54 54.366 36 52 52.5528 4985 10-Sep-98 12:54 PM 8 KY980922OLS007 Spring Sand Spring 110 3 19.8377 36 55 55.8119 5010 22-Sep-98 10:10 AM 9 KY980922OLW008 Well Monument Valley Park 110 6 48.3239 36 58 53.5044 5530 22-Sep-98 8:34 AM 10 KY980922OLS008 Spring Tsiah Spring 110 8 2.15520 36 55 41.3190 5422 22-Sep-98 4:59 PM 11 KY980922OLW009 Well Monument Valley High School 110 10 42.511 37 0 20.16539 5120 22-Sep-98 11:36 AM 12 KY980921OLW007 Wind Mill Tank 8AI-1 110 18 34.589 37 1 17.04720 4837 21-Sep-98 3:05 PM 13 KY980923OLW010 Wind Mill Tank 8AI-3 110 13 51.923 37 2 32.83681 4878 23-Sep-98 7:58 AM 14 KY980921OLS004 Spring Moonlight Water 110 18 30.982 37 1 21.65761 4829 21-Sep-98 1:55 PM 15 KY980921OLS006 Spring Truck Cab Spring 110 19 36.643 37 0 19.27800 4836 21-Sep-98 4:01 PM 16 KY980909OLW003 Well Shallow Well El Capitan 110 19 48.964 36 58 15.2357 4920 09-Sep-98 12:26 PM 17 KY980902OLW002 Wind Mill Tank 8K-402 110 12 29.139 36 57 16.0674 5157 02-Sep-98 4:20 PM 18 KY980902OLW001 Wind Mill Tank 8A-299 110 17 29.530 36 56 50.6478 5028 02-Sep-98 12:10 PM 19 KY980923OLW011 Well Well 8T-525 110 18 22.740 36 56 19.8743 5011 23-Sep-98 9:51 AM

7.8 20 KY980923OLS009 Spring 8A-P.H.S.-22 Spring 110 15 55.235 36 51 16.8480 5257 23-Sep-98 11:28 AM 21 KY980909OLS001 Spring Ramp Spring 110 22 7.0776 36 56 53.3940 5241 09-Sep-98 1:18 PM 22 KY980831SHS001 Spring Aspen Spring 110 31 8.1977 36 48 26.5362 7383 31-Aug-98 11:27 AM 23 KY980831SHW001 Wind Mill Tank 2K-305 110 34 29.954 36 46 41.8019 7270 31-Aug-98 9:53 AM 24 KY981009KYW002 Well Kayenta Chapter House 110 15 17.050 36 43 27.9336 5603 09-Oct-98 9:31 AM 25 KY980901DES001 Spring Baby Rock Spring 8-44 110 3 13.2743 36 44 49.6547 5229 01-Sep-98 1:45 PM 26 KY981009KYW003 Wind Mill Tank 8A-138 110 9 7.85638 36 41 34.7219 5427 09-Oct-98 10:41 AM 27 KY981009KYS001 Spring Kee Mi Kay Spring 110 11 1.5587 36 40 23.9987 5565 09-Oct-98 11:26 AM 28 KY981009KYW004 Wind Mill Tank 8T-549 110 12 49.674 36 39 41.6148 5748 09-Oct-98 11:53 AM 29 KY980831SHS002 Spring Shonto Chapter House 110 38 40.300 36 35 38.9843 6178 31-Aug-98 1:19 PM 30 KY000112OLW013 Well Goulding Well 110 13 4.8168 37 0 17.62621 5368 12-Jan-00 1:07 PM 31 KY000112OLW014 Well Monument Pass Well 110 6 59.9004 37 2 7.366811 5441 12-Jan-00 2:28 PM 110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

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MAP FEATURES U.S. Environmental Protection Agency Y# Water Sample Site 5 0 5 Miles ABANDONED URANIUM MINES PROJECT § Spring (GNIS) used in project planning WATER SAMPLE LOCATIONS 5 0 5 10 Kilometers Ì Mine or Mineral occurence (MRDS 4 1:350,000 and MILS) used in project planning Monument Valley Area ABANDONED URANIUM MINES PROJECT MONUMENT VALLEY AREA

WATER SAMPLE ANALYSIS FOR STABLE METALS

Map ID Sample ID Sample Name Al Sb2 As2,4 Ba Be2,4 Cd2,4 Cr2,5 Cu2 Fe2 Pb2 Mn2 Hg2 Ni2 Se2 Ag2 Th2,5 V2 Zn2 ILCRsta1,7 HI3,6

Primary MCLs in Micrograms per Liter (µg/L)7 1000 6 50 1000 4 5 100 1300 300 15 50 2 None 50 100 2 None 5000

PRG Limits in Micrograms per Liter (µg/L)8 37000 15 0.045 2600 73 18 180 1400 1100 4 1700 11 730 189 180 2.6 260 11000

1 KY980910OLS003 Tse-li-chee-hateh Spring 58.8 0 7.6 64.4 0 0 0 0 0 0 0 0.071 0 4.0 0 0 10.6 5.2 1.69E-04 0.79 2 KY980910OLW004 Stockpile Well 222.0 0 8.2 9.5 0 0 0 2.5 4,050.0 1.5 43.3 0.190 0 0 0 0 1.0 30.8 1.82E-04 1.17 3 KY980910OLS002 Kiishzhinii-be-toh Spring 68.6 0 4.0 125.0 0 0 0 6.8 1270.0 16.8 96.4 0.071 0 0 0 0 1.0 3,720.0 8.89E-05 0.94 4 KY981012OLW012 Artesian Well 613 69.1 0 0 38.9 0.2 0 0 0 20.6 0 0 0.190 0 0 0 0 0.9 8.8 0.00E+00 0.04 5 KY980901DEW002 Tank 8T-519 48.0 0 2.8 20.2 0 0 0 0 56.7 2.3 0.6 0.071 0 0 0 0 8.4 479.0 6.22E-05 0.35 6 KY980901DEW001 Tank-East Of Chapter 45.7 0 0 13.0 0 0 0 16.0 329.0 0 1.6 0 0 0 0 3.6 3.2 142.0 0.00E+00 1.46 7 KY980910OLW005 Shallow Well-Adakai 90.8 0 6.6 34.5 0 0 0 2.2 95.3 3.0 29.4 0.072 0 0 0 0 6.9 283.0 1.47E-04 0.70 8 KY980922OLS007 Sand Spring 480.0 0 0 114.0 0.3 1.1 0 0 197.0 10.3 20.1 0.084 0 14.8 0 0 6.4 6.6 0.00E+00 0.26 9 KY980922OLW008 Monument Valley Park 72.6 0 0 278.0 0.4 0 0 11.2 0 0 0 0.140 0 0 0 0 2.8 28.1 0.00E+00 0.15 10 KY980922OLS008 Tsiah Spring 88.1 0 7.2 149.0 0.3 0 0 9.9 43.1 0 0.8 0.087 0 2.8 0 0 7.8 33.7 1.60E-04 0.79 11 KY980922OLW009 Monument Valley High School 82.0 0 0 282.0 0.3 0 0 119 0 4.2 0 0.130 2.7 0 0 0 2.6 30.5 0.00E+00 0.23 12 KY980921OLW007 Tank 8AI-1 98.1 0 0 27.7 0.1 0 0 29.2 325.0 1.6 14.8 0.130 0 18.4 0 0 2.2 105.0 0.00E+00 0.20 13 KY980923OLW010 Tank 8AI-3 246.0 0 3.3 6.8 0 0 5.0 0 139.0 0 7.7 0.120 0 13.2 0 4.0 7.5 346.0 7.33E-05 2.03 14 KY980921OLS004 Moonlight Water 97.7 0 0 211.0 0 0 0 0 118.0 2.0 23.2 0.170 0 0 0 0 0 27.6 0.00E+00 0.13 15 KY980921OLS006 Truck Cab Spring 683.0 0 0 32.3 0.1 0 0 0 651.0 0 39.8 0.130 0 0 0 3.1 3.6 23.9 0.00E+00 1.34 16 KY980909OLW003 Shallow Well El Capitan 73.3 0 0 45.1 0 0 0 2.8 0 0 0.6 0.072 0 0 0 0 2.4 49.2 0.00E+00 0.04 17 KY980902OLW002 Tank 8K-402 80.2 0 0 61.9 0 0 0 27.9 185.0 0 1.8 0.078 0 9.6 0 0 6.0 53.5 0.00E+00 0.15

7.10 18 KY980902OLW001 Tank 8A-299 89.9 0 13.7 13.1 0 0 0 0 182.0 0 16.4 0.072 5.3 0 0 0 0.0 86.2 3.04E-04 1.30 19 KY980923OLW011 Well 8T-525 2250.0 0 5 151.0 0.3 0 0 0 949.0 0 39.1 0.068 1.8 0 0 0 18.7 9.9 1.11E-04 0.77 20 KY980923OLS009 8A-P.H.S.-22 Spring 88.6 0 0 86.8 0.6 0 0 0 0 0 0 0.062 0 0 0 0 0 5.6 0.00E+00 0.05 21 KY980909OLS001 Ramp Spring 53.3 0 0 154.0 0 0 0 0 0 0 0 0.076 0 9.0 0 0 10.2 9.9 0.00E+00 0.16 22 KY980831SHS001 Aspen Spring 43.4 0 0 11.3 0 0 18.9 29.2 163.0 0 3.4 0.070 11.1 0 0 0 0.7 78.3 0.00E+00 0.18 23 KY980831SHW001 Tank 2K-305 57.5 0 0 98.2 0 0.4 0 0 0 0 2.7 0.067 1.6 0 0 0 1.1 1,240.0 0.00E+00 0.19 24 KY981009KYW002 Kayenta Chapter House 88.0 0 2.6 43.5 0.6 0.4 0 33.7 436.0 2.1 12.0 0.130 0 0 0 0 2.3 315.0 5.78E-05 0.41 25 KY980901DES001 Baby Rock Spring 8-44 4790.0 0 5.4 81.6 0.3 0 3.8 0 1,440.0 0 28.8 0.074 1.6 957.0 0 4.3 481.0 19.3 1.20E-04 9.40 26 KY981009KYW003 Tank 8A-138 318.0 0 5.7 10.4 0.6 0 4.3 0 1,280.0 7.5 18.7 0.120 2.0 0 0 2.9 66.4 38.0 1.27E-04 2.08 27 KY981009KYS001 Kee Mi Kay Spring 100.0 0 0 39.0 0.5 0 0 0 0 0 0 0.099 0 13.9 0 0 11.2 59.3 0.00E+00 0.16 28 KY981009KYW004 Tank 8T-549 106.0 0 8.8 2.4 0.5 0 0 0 346.0 3.5 3.6 0.1 0 0 0 0 18.7 307 1.96E-04 0.95 29 KY980831SHS002 Shonto Chapter House 74.7 0 0 152.0 0 0 0 3 0 0 0.4 0.072 0 0 0 0 4.4 91.0 0.00E+00 0.09 30 KY000112OLW013 Goulding Well 30.0 0 0.4 198.0 0 0 0 0 0 0 0 0 0 4.3 0 0 5.3 12.4 9.11E-06 0.16 31 KY000112OLW014 Monument Pass Well 38.0 0 3.9 46.6 0 0.3 0 238 351.0 25.4 14.1 0 0 7.4 0 0 35.4 134.0 8.56E-05 0.78

1. ILCR = Incremental Lifetime Cancer Risk with Respect to Stable Metals. 2. The values of “0” represent a result of either “not detected” at the detection limit of the laboratory method or a negative count. In both cases, the result can be considered “0”. 3. The evaluation of Beta is in two steps. The initial screening level is 50 pCi/L. If the measured level of Beta exceeds the 50 pCi/L, a further evaluation is merited. Beta-emitting radionuclides would be screened. 4. The values of “0” in the Pb210 column represent analytical results that measured less than the Minimum Detectable Activity (MDA). 5. Definition of final calculations and ranking is described and published in Appendix A.1 Summary of the Characterization of Risk Leading to Exposure Reduction. 6. When comparing these PRG’s with the U.S. EPA’s PRG list, the calculated PRG used for U238 is less than the EPA’s PRG for U238D (D meaning that its decay daughters are included in the risk calculations). 7. MCL – Maximum Contaminant Levels are the maximum permissible level of a contaminant in water delivered to users of a public water system. 8. PRG – Preliminary Remediation Goals are tools for evaluating and cleaning up contaminated sites. They are risk-based concentrations derived from standardized equations, combining exposure information assumptions and EPA toxicity data.

Al = Aluminum Sb = Antimony As = Arsenic Ba = Barium Be = Beryllium Cd = Cadmium Cr = Chromium Cu = Copper Fe = Iron Pb = Lead Mn = Manganese Hg = Mercury Ni = Nickel Se = Selenium Ag = Silver Th = Thallium V = Vanadium Zn = Zinc HI = Hazard Index " 110°52'01" 110°44'02" 110°36'03" 110°28'04" 110°20'05" 110°12'06" 110°4'07" 109°56'08" 109°48'09" 109°40'10"37°11'51" 109°32'11" 1 5 ' 1 1 ° 7 3

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U.S. Environmental Protection Agency 5 0 5 Miles MAP FEATURES WATER SAMPLE ANALYSIS ABANDONED URANIUM 5 0 5 10 Kilometers MINES PROJECT Y# Water Sample Site - Stable Metals FOR 4 STABLE METALS 1:350,000 Monument Valley Area ABANDONED URANIUM MINES PROJECT MONUMENT VALLEY AREA

WATER SAMPLE ANALYSIS FOR RADIOACTIVE METALS

Map ID Sample ID Sample Name Alpha2 Beta3 Lead2104 Radium2262 Radium2282 Thorium2282 Thorium2302 Thorium2322 Uranium2342 Uranium2352 Uranium2382,6 ILCRrad1,5

Primary MCLs in Pico-curies per Liter (pCi/L)7 15 50 None 5 5 None None None 20 20 20

PRG Limits in Pico-curies per Liter (pCi/L)8 None None 0.047 0.16 0.19 0.21 1.3 1.5 1.1 1.1 0.71 1 KY980910OLS003 Tse-li-chee-hateh Spring 4.39 2.51 1.32 0.056 0.416 -0.002 0.000 0.000 3.34 0.039 2.03 3.66E-05 2 KY980910OLW004 Stockpile Well 0.25 4.53 0.80 0.053 0.301 -0.001 0.012 0.000 0.35 0.055 0.06 1.94E-05 3 KY980910OLS002 Kiishzhinii-be-toh Spring 3.87 4.38 0.55 0.221 0.191 -0.008 0.013 -0.001 1.71 -0.021 1.53 1.77E-05 4 KY981012OLW012 Artesian Well 613 4.60 2.87 0.46 0.043 0.368 -0.012 0.010 0.005 2.37 0.041 1.31 6.25E-06 5 KY980901DEW002 Tank 8T-519 1.14 1.04 0.08 0.091 0.212 0.043 0.002 0.009 0.67 0.068 0.14 2.76E-06 6 KY980901DEW001 Tank-East Of Chapter 2.00 2.35 0.19 0.068 0.144 0.043 0.008 0.000 2.14 0.031 0.33 3.84E-06 7 KY980910OLW005 Shallow Well-Adakai 3.77 2.98 0.36 0.019 0.275 -0.011 0.009 0.000 1.86 0.046 1.17 4.95E-06 8 KY980922OLS007 Sand Spring 2.93 9.62 0.47 0.098 0.824 0.178 0.079 0.074 2.37 -0.016 1.41 1.00E-05 9 KY980922OLW008 Monument Valley Park 1.95 1.92 0.60 0.102 0.650 0.026 0.003 -0.002 1.29 0.046 0.49 1.88E-05 10 KY980922OLS008 Tsiah Spring 3.23 8.50 0.71 0.217 0.681 0.036 0.010 0.006 2.67 0.047 1.07 2.42E-05 11 KY980922OLW009 Monument Valley High School 1.14 2.25 0.33 0.099 0.864 0.027 0.005 -0.001 0.97 0.037 0.58 7.02E-06 12 KY980921OLW007 Tank 8AI-1 6.09 7.23 0.51 0.061 0.892 0.007 0.007 0.000 2.75 0.111 2.22 1.08E-05 13 KY980923OLW010 Tank 8AI-3 10.30 17.90 0.32 0.379 0.946 0.023 0.000 -0.045 10.30 0.347 4.56 2.36E-05 14 KY980921OLS004 Moonlight Water 4.15 6.59 0.28 0.172 0.604 0.004 -0.001 0.000 2.24 0.146 1.85 9.05E-06 15 KY980921OLS006 Truck Cab Spring 19.80 10.80 0.57 0.052 0.333 0.031 0.021 0.017 11.30 0.244 7.13 2.28E-05 16 KY980909OLW003 Shallow Well El Capitan 8.41 7.47 1.12 0.127 0.208 0.008 0.005 0.000 6.29 0.125 4.19 3.75E-05 17 KY980902OLW002 Tank 8K-402 1.59 5.13 0.61 0.080 0.217 0.015 -0.002 0.000 0.92 -0.003 0.48 1.61E-05 18 KY980902OLW001 Tank 8A-299 155.00 92.10 0.39 7.840 0.422 0.099 0.007 0.000 91.30 3.830 76.80 2.46E-04

7.12 19 KY980923OLW011 Well 8T-525 1.59 10.10 0.42 0.092 0.511 0.075 0.024 0.024 1.16 0.000 0.52 5.44E-06 20 KY980923OLS009 8A-P.H.S.-22 Spring 1.95 4.87 0.62 0.272 0.533 0.017 0.011 0.000 2.13 -0.017 1.57 8.74E-06 21 KY980909OLS001 Ramp Spring 4.53 9.20 0.62 0.124 0.016 -0.006 0.010 0.000 2.94 0.078 2.09 1.98E-05 22 KY980831SHS001 Aspen Spring 0.27 1.36 0.74 0.074 0.212 0.009 0.006 0.000 -0.01 0.037 -0.02 1.73E-05 23 KY980831SHW001 Tank 2K-305 1.77 2.35 2.68 0.070 0.353 -0.023 0.000 -0.003 0.50 -0.003 -0.01 5.98E-05 24 KY981009KYW002 Kayenta Chapter House 3.88 4.14 0.69 0.058 0.272 -0.021 0.005 0.000 2.98 0.081 1.17 6.23E-06 25 KY980901DES001 Baby Rock Spring 8-44 27.10 14.50 0.83 0.093 0.075 -0.011 -0.002 -0.002 18.40 0.687 17.20 6.01E-05 26 KY981009KYW003 Tank 8A-138 1.40 3.01 0.19 0.044 -0.017 -0.001 0.009 0.000 2.91 0.047 1.05 4.45E-06 27 KY981009KYS001 Kee Mi Kay Spring 12.00 7.70 2.33 0.400 0.183 0.015 0.004 0.000 5.83 0.302 3.98 6.43E-05 28 KY981009KYW004 Tank 8T-549 1.43 0.99 0.50 0.022 0.183 0.015 0.000 0.000 1.27 0.040 0.60 3.21E-06 29 KY980831SHS002 Shonto Chapter House 2.34 3.58 0.14 0.118 0.556 0.019 0.000 0.000 2.09 0.141 0.35 6.28E-06 30 KY000112OLW013 Goulding Well 1.20 3.10 1.60 0.000 2.300 0.300 0.300 0.300 1.50 0.400 1.30 1.75E-05 31 KY000112OLW014 Monument Pass Well 19.50 21.10 4.60 -0.100 1.800 0.200 0.200 0.200 24.40 0.900 14.70 5.44E-05

1. ILCR = Incremental Lifetime Cancer Risk with Respect to Radioactive Metals. 2. The values of “0” represent a result of either “not detected” at the detection limit of the laboratory method or a negative count. In both cases, the result can be considered “0”. 3. The evaluation of Beta is in two steps. The initial screen level is 50pCi/l. If the measured level of Beta exceeds the 50 pCi/L, a further evaluation is merited. The Beta-emitting radionuclides would be screened. 4. The values of “0” in the Lead210 column represent analytical results that measured less than the Method Detection Activity (MDA). 5. Definition of final calculations and ranking is described and published in Appendix A.1 Summary of the Characterization of Risk Leading to Exposure Reduction. 6. When comparing these PRG’s with the U.S. EPS’s PRG list, the calculated PRG used for Uranium238 is less than the EPA’s PRG for Uranium238D (D meaning that its decay daughters are included in the risk calculations). 7. MCL – Maximum Contaminant Levels are the maximum permissible level of a contaminant in water delivered to users of a public water system. 8. PRG – Preliminary Remediation Goals are tools for evaluating and cleaning up contaminated sites. They are risk-based concentrations derived from standardized equations, combining exposure information assumptions and EPA toxicity data. 110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

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U.S. Environmental Protection Agency MAP FEATURES WATER SAMPLE ANALYSIS 5 0 5 Miles ABANDONED URANIUM MINES PROJECT Y# FOR 5 0 5 10 Kilometers Water Sample Site - Radioactive Metals RADIOACTIVE METALS 4 1:350,000 Monument Valley Area ABANDONED URANIUM MINES PROJECT MONUMENT VALLEY AREA

SUMMARY OF WATER QUALITY ANALYSIS WITH RESPECT TO STABLE AND RADIOACTIVE METALS

Hazard Total Cancer 3 3 2 Water Quality with Respect to Stable and 6 Map ID Sample ID Sample Name Index Arsenic Lead Total U Risk Category Risk Ranking Risk Radioactive Metals4 (HI) Primary MCLs in Micrograms per Liter (µg/L)7 50 15 305

PRG Limits in Micrograms per Liter (µg/L)8 0.045 4 None Less Risk Some Risk More Risk 1 KY980910OLS003 Tse-li-chee-hateh Spring 2.05E-004 0.79 7.6 0 5.37 ILCR SOME 21 2 KY980910OLW004 Stockpile Well 2.02E-004 1.17 8.2 1.5 0.35 ILCR, HI SOME 20 3 KY980910OLS002 Kiishzhinii-be-toh Spring 1.07E-004 0.94 4 16.8 3.24 Lead MORE 28 4 KY981012OLW012 Artesian Well 613 6.25E-006 0.04 0 0 3.68 X LESS 2 5 KY980901DEW002 Tank 8T-519 6.50E-005 0.35 2.80 2.3 0.67 ILCR SOME 13 6 KY980901DEW001 Tank-East Of Chapter 3.84E-006 1.46 0 0 2.47 HI SOME 7 7 KY980910OLW005 Shallow Well-Adakai 1.52E-004 0.70 6.6 3 3.03 ILCR SOME 22 8 KY980922OLS007 Sand Spring 1.00E-005 0.26 0 10.3 3.78 ILCR, Lead SOME 26 9 KY980922OLW008 Monument Valley Park 1.88E-005 0.15 0 0 1.78 ILCR SOME 8 10 KY980922OLS008 Tsiah Spring 1.84E-004 0.79 7.2 0 3.74 ILCR SOME 18 11 KY980922OLW009 Monument Valley High School 7.02E-006 0.23 0 4.2 1.55 Lead SOME 15 12 KY980921OLW007 Tank 8AI-1 1.08E-005 0.20 0 1.6 4.97 ILCR SOME 14 13 KY980923OLW010 Tank 8AI-3 9.69E-005 2.03 3.3 0 15.21 ILCR, HI SOME 25 14 KY980921OLS004 Moonlight Water 9.05E-006 0.13 0 2.0 4.09 X LESS 4 15 KY980921OLS006 Truck Cab Spring 2.28E-005 1.34 0.0 0 18.43 ILCR, HI SOME 24 16 KY980909OLW003 Shallow Well El Capitan 3.75E-005 0.04 0 0 10.48 ILCR SOME 17

7.14 17 KY980902OLW002 Tank 8K-402 1.61E-005 0.15 0 0 1.40 ILCR SOME 6 18 KY980902OLW001 Tank 8A-299 5.51E-004 1.30 13.7 0 171.93 Total U MORE 31 19 KY980923OLW011 Well 8T-525 1.17E-004 0.77 5 0 1.68 ILCR SOME 12 20 KY980923OLS009 8A-P.H.S.-22 Spring 8.74E-006 0.05 0 0 3.70 X LESS 3 21 KY980909OLS001 Ramp Spring 1.98E-005 0.16 0 0 5.03 ILCR SOME 11 22 KY980831SHS001 Aspen Spring 1.73E-005 0.18 0 0 0 ILCR SOME 5 23 KY980831SHW001 Tank 2K-305 5.98E-005 0.19 0 0 0.5 ILCR SOME 9 24 KY981009KYW002 Kayenta Chapter House 6.40E-005 0.41 2.6 2.1 4.15 ILCR SOME 16 25 KY980901DES001 Baby Rock Spring 8-44 1.80E-004 9.40 5.4 0 36.29 Total U MORE 29 26 KY981009KYW003 Tank 8A-138 1.31E-004 2.08 5.7 7.5 3.96 ILCR, Lead, HI SOME 27 27 KY981009KYS001 Kee Mi Kay Spring 6.43E-005 0.16 0 0 10.11 ILCR SOME 19 28 KY981009KYW004 Tank 8T-549 1.99E-004 0.95 8.8 3.5 1.87 ILCR SOME 23 29 KY980831SHS002 Shonto Chapter House 6.28E-006 0.09 0 0 2.44 X LESS 1 30 KY000112OLW013 Goulding Well 2.66E-005 0.16 0.4 0 3.20 ILCR SOME 10 31 KY000112OLW014 Monument Pass Well 1.40E-004 0.78 3.9 25.4 40.00 Lead, Total U MORE 30

1. ILCR = Incremental Lifetime Cancer Risk with Respect to Stable Metals and Radioactive Metals. 2. The PRG’s and MCL’s for Alpha, Beta, and Uranium are in Pico-Curies per Liter (pCi/L). 3. The PRG’s and MCL’s for Lead and Arsenic are in Micrograms per Liter (µg/L). 4. Water Quality Levels: Less Risk Total Cancer Risk is less than or equal to 1E-05 and Hazard Index is less than or equal to 1 and Lead is less than 4 and Total Uranium is less than 30. Some Risk Total Cancer Risk is less than or equal to 6E-04 but greater than 1E-05 or Hazard Index is less than 10 but greater than 1 or Lead is less than 15 but greater than 4 and Total Uranium is less than 30. More Risk Total Cancer Risk is greater than 6E-04 or Hazard Index is greater than 10 or Lead is greater than 15 or Total Uranium is equal to or greater than 30. 5. Proposed EPA MCI is 30 pCi/L for the sum of the three Uranium isotopes. 6. The definitions of the risk categories and the ranking is described and published in Appendix A.1 Summary of the Characterization of Risk Leading to Exposure Reduction. 7. MCL – Maximum Contaminant Levels are the maximum permissible level of a contaminant in water delivered to users of a public water system. 8. PRG – Preliminary Remediation Goals are tools for evaluating and cleaning up contaminated sites. They are risk-based concentrations derived from standardized equations, combining exposure information assumptions and EPA toxicity data. 110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

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Y# Less Risk U.S. Environmental Protection Agency Total Cancer Risk is less than or equal to 1E-05 and Hazard Index is less than or equal to 1 and Lead is less than 4 and U is less than 30. SUMMARY OF WATER QUALITY 5 0 5 Miles ABANDONED URANIUM Some Risk Y# 5 0 5 10 Kilometers MINES PROJECT Total Cancer Risk is less than or equal to 6E-04 but greater than 1E-05 or Hazard Index is ANALYSIS WITH RESPECT TO less than 10 but greater than 1 or Lead is less than 15 but greater than 4 and U is less than 30. Y# More Risk 4 STABLE AND RADIOACTIVE METALS 1:350,000 Total Cancer Risk is greater than 6E-04 or Hazard Index is Monument Valley Area greater than 10 or Lead is greater than 15 or U is equal to or greater than 30. 110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

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Aerial Derived contour-level Estimated exposure rate Y# Less Risk Radiation Bismuth 214 photo-peak from excess Bismuth 214 U.S. Environmental Protection Agency Contours (excess counts per second) (excess micro-R/hour) 5 0 5 Miles ABANDONED URANIUM 80 3.5 SUMMARY OF Y# Some Risk 5 0 5 10 Kilometers MINES PROJECT 170 7.4 WATER QUALITY ANALYSIS 250 10.9 800 34.9 4 AND BISMUTH 214 CONTOURS 1:350,000 Y# More Risk 1200 52.4 Monument Valley Area 110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

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110°52'30" 110°45'00" 110°37'30" 110°30'00" 110°22'30" 110°15'00" 110°7'30" 110°00'00" 109°52'30" 109°45'00" 109°37'30" 109°30'00"

Aerial Derived contour-level Estimated exposure rate Y# Less Risk Radiation Bismuth 214 photo-peak from excess Bismuth 214 U.S. Environmental Protection Agency Contours (excess counts per second) (excess micro-R/hour) SUMMARY OF 5 0 5 Miles ABANDONED URANIUM 80 3.5 Some Risk 5 0 5 10 Kilometers MINES PROJECT Y# 170 7.4 WATER QUALITY ANALYSIS 250 10.9 800 34.9 4 AND BISMUTH 214 CONTOURS 1:350,000 Y# More Risk 1200 52.4 Monument Valley Area 110°30' 110°25' 110°20' 110°15' 110°10' 3 7 ° ' 5 5 ' ° 7 3 3 7 ° ' 0 0 0 0 ' ° 7 3 7 . 1 8

110°30' 110°25' 110°20' 110°15' 110°10' OLJATO - NORTH

Aerial Derived contour-level Estimated exposure rate Radiation Bismuth 214 photo-peak from excess Bismuth 214 U.S. Environmental Protection Agency Contours (excess counts per second) (excess micro-R/hour) AERIAL RADIATION CONTOURS 1 0 1 2 Miles ABANDONED URANIUM 80 3.5 1 0 1 2 3 Kilometers MINES PROJECT 170 7.4 BISMUTH 214 250 10.9 800 34.9 4 OLJATO - NORTH 1:100,000 1200 52.4 Monument Valley Area 110°30' 110°25' 110°20' 110°15' 110°10' 3 6 ° ' 5 5 5 5 ' ° 6 3 7 . 1 9 3 6 ° ' 5 0 0 5 ' ° 6 3

110°30' 110°25' 110°20' 110°15' 110°10' OLJATO - SOUTH

Aerial Derived contour-level Estimated exposure rate Radiation Bismuth 214 photo-peak from excess Bismuth 214 U.S. Environmental Protection Agency Contours (excess counts per second) (excess micro-R/hour) AERIAL RADIATION CONTOURS 1 0 1 2 Miles ABANDONED URANIUM 80 3.5 1 0 1 2 3 Kilometers MINES PROJECT 170 7.4 BISMUTH 214 250 10.9 800 34.9 4 OLJATO - SOUTH 1:100,000 1200 52.4 Monument Valley Area 109°55' 109°50' 110°10' 110°5' 110°00' 3 7 ' ° 3 0 0 7 0 0 ° ° ' ' 0 7 0 0 0 3 ' ° 7 3 7 . 2 0 3 6 ' ° 3 5 5 6 5 5 ° ° ' ' 5 6 5 5 3 5 ' ° 6 3

109°55' 109°50' 110°10' 110°5' 110°00' CANE VALLEY MONUMENT VALLEY PARK

Aerial Derived contour-level Estimated exposure rate Radiation Bismuth 214 photo-peak from excess Bismuth 214 U.S. Environmental Protection Agency Contours (excess counts per second) (excess micro-R/hour) AERIAL RADIATION CONTOURS 1 0 1 2 Miles ABANDONED URANIUM 80 3.5 1 0 1 2 3 Kilometers MINES PROJECT 170 7.4 BISMUTH 214 250 10.9 800 34.9 4 CANE VALLEY AND MONUMENT VALLEY PARK 1:100,000 1200 52.4 Monument Valley Area