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• On 08 August 2006, well MW-5 was located in damaged and unuseable condition - no <br /> further measurements are possible. Damaged well MW-5 was capped and marked for <br /> future proper destruction. <br /> The following is a brief summary of site pilot studies and interim remediation activities: <br /> • On 16 July 1999, a limited aquifer pump test (8 hours)was performed at the site. The <br /> depth to ground water was measured in wells MW-1 through MW-4; a 2-inch Gundfos <br /> submersible pump was placed in 4-inch diameter well MW-4; pressure transducers were <br /> placed in wells MW-3 and MW-4 and connected to a data logger to record draw-down <br /> data from the wells. The initial pumping rate was calculated at 5 gallons per minute <br /> (gpm); however, excessive ground water draw-down required rate reductions as <br /> tabularized in the table below: <br /> Rate (gpm) Total Time (minutes) <br /> 5 0 <br /> 3.5 30 <br /> 3 50 <br /> 2.5 90 <br /> 1.5 310 <br /> 1.6 340 <br /> 2.5 370 <br /> 3.3 410 <br /> 3 500 <br /> • Approximately 2,000 gallons of extracted ground water was removed from well MW-4 <br /> during the 8-hour pump test. Two separate grab water samples were collected from the <br /> extracted ground water stream. Significant concentrations of BTEX compounds were <br /> reported in the samples collected from the extracted ground water stream. <br /> • The pumping rate was calculated to be 2.5 to 5.0 gpm. A draw-down of approximately <br /> 3.83 feet was observed in well MW-4 after 45 minutes of pumping. Measurable draw- <br /> down was observed in well MW-3, located approximately 60 west, but never exceeded <br /> 3.1 feet. <br /> • Well MW-4's Aquifer transmissivity was calculated to be 441.6 gallons per day-feet; the <br /> storativity was to calculated to be 68.5 (unit-less); the well efficiency was calculated to be <br /> 13.7 %,which adjusted the aquifer tranmissivity to 60.4 gallons per day-feet. <br /> Advanced GeoEnvironmental,Inc. <br />