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7-Eleven/Stockton 17 <br /> April, 1988 <br /> below grade. 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 pumpi-ig 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 /> q manually using a water-sensing Interface ProbeR. Drawdown <br /> adequate for pump-test analysis only occurred in monitoring wells <br /> F.: <br /> MW-1, MW-2, and MW-4. <br /> �f <br /> i + 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 /> 6 : hours of pumping was 0.59 gallons per minute per foot (qpm/ft) . <br /> i*+ This is a low value of specific capacity relative to values <br /> i , obtained for wells constructed in true groundwater aquifers. <br /> kms. <br /> Following pump shut off at the end of the pump test, aquifer <br /> ems. <br /> recovery measurements were recorded in RW-1 and MW-4. Analysis <br /> of reccvery data supplies an in-depth check on pumping-test <br /> results. <br /> r <br /> �#1'141 GROUNn�vnTFR <br /> L... L T TecIINOIOi;k INC. <br />