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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 /> • Storativrty cannot be calculated since no draw-down was observed in nearby wells <br /> • The Jacobs Straight Line Method can be utilized to calculate transmissivity(T) utilizing <br /> draw-down versus time (minutes) on semi-loganthmic paper for each well location <br />' (Appendix B) <br /> T=transmissivity <br />' Q=constant ground water pumping rate <br /> As—draw-down per 1-logarithmic cycle <br />' Pump Test No. 1: Q = 4.3 GPM; As = 8.4 ft.; tQ= 1 minute; r = 0.1667 ft. <br />' T =264Q—As -+ 264(4 3 GPM) — 8 4 ft= 135 gpd/ft <br />' Pum Test No. 2: _ .5 P • _ _ _ <br /> Pump Q 3 GPM; s 2.65 ft.; to 0.024 minutes; r 0.1667 ft. <br /> IT =264Q—As -6 264(4 3 GPM) —2 65 ft =349 gpd/ft <br /> Pump Test No. 3: Q = 3 GPM; As = 0.85 ft.; to= 0.001 minutes; r = 0.1667 ft. <br /> T = 264Q—As -1� 264(3 GPM) — 0 85 ft= 932 gpd/ft <br /> IAdvanced GeoEnvironmental,Inc <br />