SELECTED GROUND-WATER DATA, CHESTER COUNTY, PENNSYLVANIA by Ronald A. Sloto U.S. GEOLOGICAL SURVEY Open-File Report 87-217 REPRODUCED FROM BEST AVAILABLE COPY Prepared in cooperation with the CHESTER COUNTY WATER RESOURCES AUTHORITY Harr i sburg, Pennsylvania 1989 UNITED STATES DEPARTMENT OF THE INTERIOR DONALD PAUL MODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information Copies of this report write to: can be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey, WRD Books and Open-File Reports Section 4th Floor, Federal Building Box 25425 P.O. Box 1107 Federal Center Harrisburg, Pennsylvania 17108-1107 Denver, Colorado 80225 ii CONTENTS Page Abstract ........................................................... 1 Introduction ....................................................... 1 Site-identification system ......................................... 1 Aquifer codes ...................................................... 3 References cited ................................................... 6 ILLUSTRATIONS Plates [In Pocket] Plates 1 and 2.--Geologic map showing location of selected wells and springs: 1.--Northern Chester County, Pennsylvania 2.--Southern Chester County, Pennsylvania Figures Figure 1.--Map showing location of Chester County .................. 2 TABLES Table 1.--Aquifer codes ............................................ 4 2.--Records of wells ......................................... 7 3.--Water levels in selected wells ........................... 96 4.--Records of selected springs .............................. 121 5-16.--Results of chemical analysis for: 5.--Physical properties .................................. 122 6.--Major ions, total organic carbon, and phenols ........ 132 7.--Nutrients ............................................ 151 8.--Metals and other trace constituents .................. 160 9.--Volatile organic compounds ........................... 176 10.--Acid organic compounds ............................... 186 11.--Base-neutral organic compounds ....................... 187 12.--Organochlorine insecticides, polychlorinated biphenyls and polychlorinated napthalenes .......... 190 13.--Organophosphorous insecticides ....................... 195 14.--Organic acid herbicides .............................. 196 15.--Triazine herbicides, alachlor, and trifluralin ....... 197 16.--Radionuclides ........................................ 198 iii CONVERSION FACTORS AND ABBREVIATIONS For the convenience of readers who may prefer to use metric (International System) units, rather than the inch-pound units used in this report, values can be converted with the following factors: Multiply inch-pound unit By To obtain metric unit inch (in.) 25.4 millimeter (mm) foot (ft) 0.3048 meter (m) square mile (mi2 ) 2.59 square kilometer (km2 ) gallon per minute 0.06308 liter per second (gal/min) (L/s) gallon per minute 0.207 liter per second per foot per meter [(L/s)/m] [(gal/min)/ft] Temperature Conversion Temperature in degrees Celsius (°C) is converted to degrees Fahrenheit (°F) by the equation: °F - (9/5)°C + 32 iv SELECTED GROUND-WATER DATA, CHESTER COUNTY, PENNSYLVANIA By Ronald A. Sloto ABSTRACT Hydrologic data for Chester County, Pennsylvania are given for 3,010 wells and 32 springs. Water levels are given for 48 observation wells measured monthly during 1936-86. Chemical analyses of ground water are given for major ions, physical properties, nutrients, metals and other trace constituents, volatile organic compounds, acid organic compounds, base-neutral organic com­ pounds, organochlorine insecticides, polychlorinated biphenyls, polychlorinated napthalenes, organophosphorous insecticides, organic acid herbicides, triazine herbicides, other organic compounds, and radionuclides. INTRODUCTION This report presents data collected for several investigations of the ground-water resources of Chester County, Pennsylvania, in southeastern Pennsylvania (fig. 1). Hydrologic date are given for 3,010 wells and 32 springs. Water levels are given for observation wells measured monthly during 1936-86. Chemical analyses of ground water are given for major ions, phys­ ical properties, nutrients, metals and other trace constituents, volatile organic compounds, acid organic compounds, base-neutral organic compounds, organochlorine insecticides, polychlorinated biphenyls, polychlorinated napthalenes, organophosphorous insecticides, organic acid herbicides, triazine herbicides, other organic compounds, and radionuclides. The purpose of this report is to provide a convenient reference for ground-water data for Chester County. It was prepared in cooperation with the Chester County Water Resources Authority. Some of the data appear in earlier publications by Hall (1934), Rima and others (1962), Poth (1968), McGreevy and Sloto (1976), Wood (1980), and Sloto (1987). 76C 75* 40°30' \ 1 X \ '' ( ' N\ BERKS LEBANON \ COUNTY /' \ BUCKS \ COUNTY >. / x . COUNTY ^ ^ \ A- A MONTGOMERY \ x V \ys \ COUNTY ^ ^ 40° LANCASTER (' ^-^ ,^'\/^^'' COUNTY 1 ^ \/^/ ( J \ / CHESTER ^x ,' COUNTY / DELAWARE C 1 LOCATION OF ' COUNTY ^ CHESTER J. _ ^ '" COUNTY ^\/' NEW JERSEY YORK\\ // /^ °°«[DLA..^1._ -/DEL*VARE; ° ? ? MILES MARYLAND 39°30' 1 i / 0 5 10 |I5 KILOMETERS Figure 1. Location of Chester County. SITE-IDENTIFICATION SYSTEM The well-numbering system used consists of a county abbreviation followed by a sequentially assigned number. The prefix CH signifies Chester County. For example, CH-210 denotes a well in Chester County. The prefix CH-SP denotes a spring in Chester County. Locations of selected wells and springs are shown on plates 1 and 2. Data for these wells are given in table 2 and data for springs are given in table 4. AQUIFER CODES Table 1 lists the names of the geologic units in which wells and springs are located and the corresponding aquifer codes. The codes have seven or eight characters and consist of two or three parts. The first part has three numeric characters and identifies the era, system, or series of the geologic unit. The second part, or next four characters, is a mnemonic for the name of the geologic unit. The third part, when used, is a single character that de­ notes the lithology or stratigraphic position of the geologic unit. The aquifer codes appear in the records of wells (table 2) and springs (table 4). Except for slight modifications, the terminology used for the geologic units in this report is that of the Pennsylvania Topographic and Geologic Survey (Berg and Dodge, 1981). The nomenclature does not necessarily follow the usage of the U.S. Geological Survey. Descriptions of geologic units on plates 1 and 2 were taken from Berg and others (1980). The stratigraphic correlation of the units is that of Berg and others (1983). Table 1.--Aquifer codes Era, system or seriesi/ Code Geologic unit Upper Triassic 231DIBS Diabase 231BRCK Brunswick Formation 231HMCK Hammer Creek Formation Conglomerate 231LCKG Lockatong Formation 231SCKN Stockton Formation Middle Ordovician 300PRCK Peters Creek Schist Lower Ordovician 367CNSG Conestoga Formation to Lower Cambrian Middle Cambrian 371ELBK Elbrook Formation 377LDGR Ledger Formation Middle to Lower 377KZRS Kinzers Formation Cambrian Lower Cambrian 377VNTG Vintage Formation 377ANTM Antietarn Formation Upper Precambrian 377HRPR Harpers Formation 377CCKS Chickies Formation 377HLLM Chickies Formation, Hellam Conglomerate Member 300STRS Setters Formation Table 1.--Aquifer codes--Continued Era, system or series!/ Code Geologic unit Lower Paleozoic 300WSCKA Wissahickon Formation, albite chlorite schist 300WSCKO Wissahickon Formation, oligoclase mica schist 300CCKV Cockeysville Marble Precambrian 400FLCGH Felsic gneiss, hornblende -bear ing 400FLCGP Felsic gneiss, pyroxene -bear ing 400MFCGH Mafic gneiss, hornblende -bear ing 400MFCGP Mafic gneiss, pyroxene -bearing 400FRKL Franklin Marble 400GRGS Granitic gneiss Unknown age OOOANRS Anorthosite OOOGBBR Gabbro and gabbroic gneiss OOOGRDR Granodiorite and granodiorite gneiss OOOGRGS Granite gneiss OOOGRPC Graphitic gneiss OOOMDBS Metadiabase OOOMFCGH Mafic gneiss, hornblende -bear ing OOOMGBR Metagabbro OOOQZMZ Quartz monzonite and quartz monzonite gneiss OOOSRPN Serpentinite I/ From Berg and others (1983) REFERENCES CITED Berg, T. M., and others, 1980, Geologic map of Pennsylvania: Pennsylvania Geologic Survey, 4th ser., Map 1. Berg, T. M., and Dodge, C. M., eds., 1981, Atlas of preliminary geologic quad­ rangle maps of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 61, 636 p. Berg, T. M., Mclnerney, M. K., Way, J. H., and MacLachlan, D. B., 1983, Stratigraphic correlation chart of Pennsylvania: Pennsylvania Geologic Survey, 4th ser., General Geology Report 75. Hall, G. M., 1934, Ground water in southeastern Pennsylvania: Pennsylvania Geological Survey, 4th ser., Water Resource Report 2, 255 p. McGreevy, L. J., and Sloto, R. A., 1976, Selected hydrologic data, Chester County, Pennsylvania: U.S. Geological Survey Open-File Report, 138 p. Poth, C. W., 1968, Hydrology of the metamorphic and igneous rocks of central Chester County, Pennsylvania: Pennsylvania Geological Survey, 4th ser., Water Resource Report 25, 84 p. Rima, D. R., Meisler, Harold, and Longwill, S. M., 1962, Geology and hydrology of the Stockton Formation in southeastern Pennsylvania: Pennsylvania Geological Survey, 4th ser., Water Resource Report 14, 111 p Sloto, R. A., 1987, Effect of urbanization on the water resources of eastern Chester County, Pennsylvania: U.S. Geological Survey Water-Resources Investigations