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04/07/94 10 09 FAI 91b o7L 6761 GRUUNW)AlrR ihLH GTI CUINCORD X00.3 <br /> 1 <br /> 7-Eleven/Stockton 17 <br /> April, 1988 <br /> belowg rade. A sanitary seal was installed consisting of 2 feet <br />' of bentonite overlain with cement grout to 3-feet below grade. <br /> The recovery well was completed below grade in a traffic-rated <br /> vault. Well construction details are shown on the drill log in <br />' Appendix IV. <br /> PUMP TEST <br /> A 24-hour pump test was conducted at a constant pumping rate <br /> (Q) of 5. 0 gallons per minute (gpm) starting on March 27, 1988 . <br />' Prior to the pump test, the pump was shut off for 7 days to allow <br /> aquifer stabilization beneath the site. Water levels in ten <br /> monitoring wells were monitored during the test. The drawdown in <br /> MW-2 and MW-4 was recorded for the total duration of the test <br /> using pressure transducers. Water level measurements in eight <br />' other monitoring wells and the recovery well (RW-1) were taken <br /> manually using a water-sensing Interface ProbeR. Drawdown <br /> 1 adequate for pump-test analysis only occurred in monitoring wells <br /> MW-1, MW-2 , and MW-4 . <br /> The maximum drawdown recorded in RW-1 at the end of the pump <br /> test was 8.53 feet. The specific capacity (Q/drawdown) after 24 <br />' hours of pumping was 0. 59 gallons per minute per foot (gpm/ft) . <br /> This is a low value of specific capacity relative to values <br /> ' obtained for wells constructed in true groundwater aquifers. <br /> ' Following pump shut off at the end of the pump test, aquifer <br /> recovery measurements were recorded in RW-1 and MW-4 . Analysis <br /> of recovery data supplies an in-depth check on pumping-test <br /> results. <br /> ® GROUNDWATER <br /> ' TEcHNOLDGY.INC <br />