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4 <br /> 1050 Melody Lane, Suite 160, Roseville, Lalli ;;JOL0 678 <br /> EQ' (91 3'",M � 786 7830 <br /> ENVIRONMENTAL, INC. <br /> October 12, 1993 <br /> Mr Lynn Walker <br /> Shell Oil Company <br /> Post Office Box 5278 <br /> Concord, California 94520 <br /> Subject Quarterly Groundwater Mondonng and Remediation Report <br /> Former Shell Service Station (WIC No 204-7524-1509) <br /> 141 N EI Dorado, Stockton, California <br /> Dear Mr Walker <br /> Aegis Environmental, Inc (Aegis), is pleased to provide Shell Oil Company the attached <br /> information documenting the results of quarterly groundwater monitoring, conducted on <br /> August 26, 1993, at the subject site by Blaine Tech Services, Inc , of San Jose, <br /> California <br /> Groundwater recovery/sewer discharge and a soil venting system with granular activated <br /> carbon (GAC) emissions control are currently in operation The groundwater recovery <br /> system operation (pumping from wells RW-1 and RW-2) commenced on March 2, 1993 <br /> The venting system operation (extraction from VP-1, VP-2, VP-3, and VP-4) commenced <br /> on June 23, 1993 The venting system has been shutdown since September 21, 1993, <br /> pending GAC replacement <br /> Aegis has performed groundwater remediation system monitoring according to the sewer <br /> discharge permit issued by the City of Stockton Municipal Utilities Department Monthly <br /> sewer discharge reports have been submitted to the regulatory agencies Sewer <br /> discharge data since system startup in March 1993 is included as Attachment 4 <br /> 93 011 A OMR <br />