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=D STATES OGICAL SURVEY THE TUTU AREA, EASTERN ST. THOMAS, J.S. VIRGIN ISLANDS, SEPTEMBER 11, 1987 POTENTIOMETRIC SURFACE OF THE TURPENTINE RUN BASIN AQUIFER IN GEOLOGICAL SURVEY WATER- RESOURCES Prepared in cooperation with the US. ENVIRONMENTAL PROTECTION AGENCY GEOLOGICAL SURVE WATER-RESOURCES INVESTIGATIONS REPORT 88-41: Table 1. Description of wells and September 11, 1987 water-level measurements in Turpentine Run basin, St. Thomas, U.S Virgin Isiands [Datum is mean sea level. Abbreviations: hyphens, data not available; (RL), suspected recovering level; (PL), suspected pumping level] SS J] SS \) ay KL — "Wf ro SX JN UNITED STATES INVESTIGATIONS REPORT 88-4131 Prepared in cooperation with the U.S. ENVIRONMENTAL PROTECTION AGENCY POTENTIOMETRIC SURFACE OF THE TURPENTINE RUN BASIN AQUIFER IN THE TUTU AREA, EASTERN ST. THOMAS, U.S. VIRGIN ISLANDS, SEPTEMBER 11, 1987 By Robert P. Graves and Ralph Gonzalez Ground-water levels in the Turpentine Run basin aquifer, in eastern St. Thomas, were measured in 32 wells on September 11, 1987 and a potentiometric surface map was prepared. The altitude of all wells was referenced to known land surface altitude benchmarks by use of a level survey instrument. The potentiometric surface map was prepared by the U.S. Geological Survey in cooperation with the U.S. Environmental Protection Agency. Fractured volcanic rocks underlie Turpentine Run basin and are locally overlain by alluvial deposits (Donnelly, 1959). The alluvial deposits can range to 40 feet in thickness. Ground water in the Turpentine Run basin occurs in the fractured volcanic rock and alluvial deposits under water-table conditions (Jordan, 1973). The alluvial deposits are considered to be hydraulically connected with the fractured volcanic rock. Well depths in the basin can range from 55 to 325 feet below land surface. Several wells were being pumped, or pumping had just terminated, when the water levels were measured (table 1). These water levels reflect a pumping or recovery condition; therefore, static water-level conditions throughout the Turpentine Run basin at the time of measurement cannot be assumed. Additional information about ground-water levels in the area of study is available from the U.S. Geological Survey, Water Resources Division, Caribbean District office in San Juan, Puerto Rico, Tel. (809) 749-4346. SELECTED REFERENCES Donnelly, T.W., 1959, Geology of St. Thomas and St. John, Virgin Islands: Unpublished Ph.D. dissertation, Princeton University, 179 p. Geraghty & Miller, Inc., 1983, Report on current ground water conditions in the U.S. Virgin Islands: Prepared for the government of the U.S. Virgin Islands Department of Conservation and Cultural Affairs, 80 p. Jordan, D.G. and Cosner, 0.J., 1973, A survey of the water resources of St. Thomas, Virgin Islands: U.S. Geological Survey open-file report, 55 p. Stevens, K.E., Gomez-Gomez, F., and Alicea, J., 1981, Water wells in the U.S. Virgin Islands, Pt. 1, St. Thomas: U.S. Geological Survey Open-File Report 82-82. a a FS | 7 - “ ¢t GH-as . 7 Bos ’ ’ , : - > of 4 ? 4 s pean att nate ¢ Fae i Fc ~ a 7 ~~ noe 3 tae ss fe ¥ ; + ‘ys - ~ - P a, Lal ~ fh ‘ ‘ and 2; PP WY 18°17" 0 2 4 6 MILES ietand ov | l | ] “ Great | I ] T “ St. James I. 0 2 4 6 KILOMETERS AN Map of St. Thomas showing the study area. EXPLANATION SE a | 30 POTENTIOMET'RIC CONTOUR ~- Shows altitude of water table in feet. Dashed wihere approximately loceted. Queried (7) where locstion is uncertaiin. Contour interval variable. Datum is mean sea level. 3(208) WATER-LEVELL DATA CONTROL POINT ~ Open number is the well number shown on table 1. Number in parentheses is the altitude of water level in feet. Datum is mean sea level. BASIN BOUNDARY Depth | Depth Water level | Water Land Well Well Year of of ; below land | level surface number identification Well name drilled | well | casing Construction surface | altitude altitude adel (feet) | (feet) (feet) | (feet) (feet) 01 182024064535800 Mario Bryan Well #1 1978 140 nn a SS a SSS 215 02 182026064535800 Mario Bryan Well #2 i Seo = | | pee 11 209 220 03 182025064535800 Mario Bryan Vell #3 Saas ante =—S | | | Stee 10 208 218 04 182018064535900 Lockhart Well #1 === == ee) 7-7 So 09 183 192 05 182017064535900 Lockhart Well #2 a> ==- ee) oo 08 184 192 06 182016064535900 Lockhart Well #3 a — =o aia) occ 05 183 188 07 182016064540000 Lockhart Well #4 =e aes Ss | | Fees 06 183 189 08 182015064540000 Lockhart Well #5 SSeS = ae | 7 08 Soo Soe 09 182042064533400 Demitry Well aor == SS 80 151(RL) 231 10 182037064531100 VIHA Well #1 1977 175 41 Open hole 56 175 231 it 182038064531200 VIHA Well #2 1977 150 37 Open hole 60 175 235 12 182048064531400 VIHA Well #3 1978 142 73 Open hole 17 222 239 13 182049064530900 VIHA Well #4 1978 140 69 Open hole 39 239 278 14 182029064531500 Tillets well Sa 100 15 Open hole 21 165 186 15 182027064531800 Four Winds; Plaza well #1 SCE 300 —- | | eee 13 153 166 16 182027064531900 Four Winds; Plaza well #2 1981 285 36 Open hole 09 156 165 17 182020064532000 Gene Eglim Well #1 Boss 225 =n 12 132 144 18 182020064531900 Gene Eglim Well #2 —- 225 Cf 37 112(RL) 149 19 182019064531900 Gene Eglim Well #3 ==== -—— me | § SCS 66 86(RL) 152 20 182016064532000 E. Steel well 1950's 105 ==> | = Fees 76 99(RL) 175 21 182017064532200 Osborn Har-vey 1978 160 ee 30 108 138 22 182021064532500 Crusher Well 1978 210 me Open hole 32 108 140 23 182018064532800 Bakery Welll , 1978 325 36 Open hole 22. 108 130 24 182017064533000 Creger Mot-ors Well #1 aoa Sas == as 27 108 135 25 182018064533100 Creger Mot:ors Well #2| ---- ace -- | i — 26 109 135 26 182018064533200 Creger Mot:ors Well #3 BAe ==- == |) |e >" 21 116 137 27 182019064533300 Creger Mot:ors Well #4| ---- a Se 20 128 148 28 182015064532700 E's & A Corp Well #1 ones oe SS) ta == ae 123 29 182016064532900 E's & A Corp Well #2 eae sas oe I Bcme 18 108 126 30 182015064533000 E's & A Corp Well #3 Ses ——— Se 2==== 19 107 126 31 182014064532900 E's & A Corp Well #4 SS Ses pee 16 109 125 32 182012064531400 Francois La Place === Die ee | ees 28 2 83 111 33 182009064531300 L. Smith 1960's =o Se |p Ree 10 80 90 34 182008064531400 Matthias 1960's 55 Se Too 10 80 90 35 181943064525300 Farrington well ses oes econ 13 30 43 36 181940064525200 Poly Carib/Devcon #1 ---- --- So -- -- -- 37 181938064525100 Poly Carib/Devcon #2 ---- ae mp ES os a --- 38 181938064525000 Poly Carib/Devcon #3 ome || Se ee oe -- === 39 181937064524900 Poly Carib/Devcon #4 aes = == {| i) ---- 118 -83(PL) 35 40 181935064524400 Public wel.1/Didi well SSS So -- |e =s. 26 01 27 (Gov. of t:he Virgin Islands) 41 181921064524100 Dept. of Agriculture Say oo == 04 05 9 Animal Shelter 18°28" = idl “TO 64°50 Q : A? <> % WEST END) The study area 18°20° 64°52’ <= "ke a) Bolonga 1 KILOMETER HEOLOGICAL SURVEY R-RESOURCES DIVISION CARIBBEAN DISTRIC™ SAN JUAN, PUERTO RICc¢