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(YA <br /> A pump equipped with a flow meter, totalizer, and discharge hose will be installed into well <br /> MW3. During the test, ATC will also place transducers in well MW3 and in observation wells <br /> MW2, MW4, and MW6 to measure and tabulate the depth to water in observation wells at <br /> frequent intervals. The water level in wells MW1 and MW5 will be monitored manually. A <br /> submersible pump equipped with a flow meter capable of reading flows up to 10 gallons per <br /> minute (gpm) and a discharge hose will be installed in the groundwater extraction well. ATC will <br /> use a generator to supply power to the pump. <br /> ATC will perform a three-step drawdown test to determine the optimal flow rate for the 48-hour <br /> pumping test. Based on these results, groundwater will be extracted from the well at a constant <br /> rate estimated at 3 to 6 gpm for a period of 48 hours and discharged directly to the sanitary sewer <br /> system. These lower flow rates should be sufficient to determine removal rate for petroleum <br /> hydrocarbons in the groundwater. Higher flow rates are normally required when a larger radius of <br /> influence is needed. <br /> The pump, discharge hose, and transducers will be removed from the extraction well and the <br /> observation wells upon completion of the pumping test. <br /> Preparation of Summary Resort <br /> A summary report will be prepared after the groundwater extraction test is complete. The report <br /> will detail results of the 48-hour groundwater extraction test and, based on those results, will <br /> make recommendations for site remediation. The report will be prepared in accordance with <br /> California Regional Water Quality Control Board (RWQCB) and PHS/EHD reporting guidelines. <br /> Schedule <br /> The 48-hour groundwater extraction test will be scheduled as soon as regulatory approval of this <br /> workplan is received from PHS/EHD and costs for the remedial investigation are approved by the <br /> State Cleanup Fund. ATC will notify PHS/EHD at least 48 hours prior to beginning any field <br /> activities. The report will be submitted to PHS/EHD approximately four to five weeks after field <br /> activities have been completed. <br /> All work described in this workplan will be performed under the direction of a California <br /> Registered Civil Engineer. A completed site-specific safety plan and ATC's Quality <br /> Assurance/Quality Control Plan is on file with PHS/EHD. All fieldwork will be completed in <br /> accordance with these plans. <br /> W:\62605\IREPORTS\WPPUMP.DOC 3 <br />