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Ms Lori Duncan Project No 880-039 IA <br /> June 18, 2003 <br /> Page 9 <br /> GROUNDWATER EXTRACTION PUMP TEST <br /> In the original workplan, a step-draw down test was proposed at flow rates of 2, 5, 8, and <br /> 10 gallons per minute (gpm) in well MW-4RS During the test approximately 50 gallons <br /> of groundwater was pumped from well MW-4RS, at an average rate of 0 4 gpm The <br /> recharge rate of well MW-4RS is not capable of sustaining a higher flow rate <br /> Depth to water was monitored in the pumping well MW-4RS, and in wells VW-2, <br />' VW-3, MW-1R and MW-4RD Change in groundwater elevation was recorded almost <br /> immediately following the start of the test Well MW-4RS went dry at a flow rate of <br />' I gpm, but the flow rate stabilized near 0 4 gpm during the later part of the test <br /> Drawdown in the other wells ranged between approximately zero (MW-4RD) and 0 32 A,'` <br />' feet (VW-2) <br /> Groundwater Results <br /> Groundwater analytical data collected during the groundwater extraction test are <br /> Y <br />' summarized in Table 2 Laboratory reports with cham-of-custody (COC) documentation <br /> are included in Attachment F Concentrations of dissolved TPHg and benzene after the <br /> test were 39,000 and 3,200 Vg/L, respectively <br /> INVESTIGATION-DERIVED WASTE DISPOSAL <br /> Drill cuttings and decontamination water were contained for disposal in 55-gallon <br /> United Nations approved drums Well development and sampling purge water generated <br />' during the field investigation was contained for disposal in a portable Baker Tank The <br /> drill cuttings were removed from the site on May 15, 2003, by ABCO Environmental <br /> and transported to Forward Landfill for disposal A copy of the disposal confirmation <br /> form is included in Attachment A Approximately 200 gallons of decontamination and <br />' purge water was removed from the site by Shaw on May 6, 2003, and was transported to <br /> Shaw's Sacramento, California, office for storage pending transport and disposal at a <br /> California-certified waste disposal facility at a later date <br /> MIISACR FP 1\COMMONIsacDPti20031Pg188018800391 A 3ae doc <br />