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' FLAG CITY CHEVRON <br /> . Step-Down Ground Water Pump Test Calculations <br />' Assumptions <br /> • Pump Test No 1 constant ground water pumping rate of 4 3 GPM <br /> • Pump Test No 2 constant ground water pumping rate of 3 5 GPM <br /> • Pump Test No 3 constant ground water pumping rate of 3 0 GPM <br /> • Storativlty cannot be calculated since no draw-down was observed in nearby wells <br />' • The Jacobs Straight Line Method can be utilized to calculate transmissivlty (T) utilizing <br /> draw-down versus time (minutes) on semi-loganthmlc paper for each well location <br />' (Appendix B) <br /> T = transmisslvlty <br /> Q = constant ground water pumping rate <br />' As = draw-down per 1-loganthmlc cycle <br />' Pump Test No. 1: Q = 4.3 GPM; As = 8.4 ft.; to= 1 minute; r = 0.1667 ft. <br /> T = 264Q-As -0, 264(4 3 GPM) - 8 4 ft = 135 gpd/ft <br />' Pump Test No. 2: Q = 3.5 GPM; As = 2.65 ft.; to= 0.024 minutes; r = 0.1667 ft. <br /> T = 264Q-as -0, 264(4 3 GPM) - 2 65 ft = 349 gpolft <br /> Pump Test No. 3: Q = 3 GPM; As = 0.85 ft.; to= 0.001 minutes; r = 01667 ft. <br /> T = 264Q-As -+ 264(3 GPM) - 0 85 ft = 932 gpolft <br /> I <br />' Advanced GtoEmtronmental,Inc <br />