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1 <br />' CALIFORNIA FUELS CARDLOCK STATION <br /> t Ground Water Aquifer Pumping Test Calculations <br /> 11 July 2003 <br /> Assumptions <br /> • Extraction from EW-1 at constant ground water pumping rate of 5 0 GPM <br /> 0 Well EW-1 is screened entirely through First Water Zone (Hydrologic Unit 2) <br /> u Homogenous ground water aquifer characteristics at wells EW-1,AW-IA,AW-2A,AW-4, <br /> MW-1, MW-2 and MW-3 <br /> • The Jacobs Straight Line Method (Distance-Drawdown Method) can be utilized to <br />' calculate hydraulic conductivity,transmissivity(T)and storativity yield utilizing draw-down <br /> versus distance on semi-loganthmic paper for each well location <br />' K =hydraulic conductivity <br /> T =transmissivity <br /> S =storativity <br /> Q =constant ground water pumping rate =5.0 GPM. <br /> As = draw-down per 1-logarithmic cycle (Appendix H) = 0.62 ft. <br /> t=time of pump test (Appendix E) = 500 minutes <br /> ro = intercept of best ft line with the distance axis (Appendix F) = 62 feet <br /> b = aquifer thickness <br /> I5.0 (GPM Constant Rate Pumping 'Fest Calculations: <br /> T = 70Q—As --)- 70(5 0 GPM — 0 62 ft= 565 ft2/da or <br /> T = 565 ft2/day x 1 gpd/ft- 0 134 R2z day = 4,216 gpd/ft <br /> S =T(t) - 640 (r.)2 -4 (565 ft2/day)(500 min) - (640)(62)2 = 0.11 <br /> K=T -h -4 565 ft2/day-25 ft= 22.6 ft/day, or <br /> K=22 6 fluday 1 c Lis - 2,535 ft/day= O.008 c- <br /> IAdvanced GeoEnvironmental,Inc <br />