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Geosyntec "' Gold Canal Drive,Suite 100 <br /> Rancho Cordova,California 95670 <br /> PH 916.637.8048 <br /> consultants FAX eos.m <br /> FAX <br /> eacom <br /> 19 October 2020 <br /> Mr. Bill Brattain <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95650-6114 <br /> Subject: Request to Modify Groundwater Monitoring Requirements at Lincoln Center <br /> Lincoln Center, Stockton, California <br /> Dear Mr. Brattain: <br /> As requested by the Central Valley Regional Water Quality Board(CVRWQCB) and on behalf of <br /> the Lincoln Center Environmental Remediation Trust ("the Trust"), Geosyntec Consultants Inc. <br /> (Geosyntec) is submitting this request to modify the groundwater monitoring network and <br /> monitoring frequency under the current groundwater monitoring programs for the Lincoln Center <br /> site in Stockton, California (the "Site"). The purpose of this request is to identify a path forward <br /> to modify the groundwater monitoring frequency and analytes at specific monitoring locations <br /> based on the remedial progress to date,to destroy wells that are no longer in use and to memorialize <br /> the process for future such requests <br /> Groundwater monitoring at the Site is conducted under two existing programs that complement <br /> each other: 1) the Sitewide Groundwater Monitoring Plan (GWMP) and 2) the CVRWQCB <br /> Waste Discharge Requirements (WDR) for In-Situ Groundwater Remediation and Discharge of <br /> Treated Groundwater to Land Order No. R5-2016-0012-013 Monitoring and Reporting Program <br /> (WDR-MRP2). The GWMP is used to monitor changes in groundwater elevation and contaminant <br /> 1 ERM. 2015. Groundwater Monitoring Report Annual Sampling—July 2014 through June 2015 Lincoln Center, <br /> Stockton,California.29 July <br /> 2 California Regional Water Quality Control Board,Central Valley Region(CVRWQCB). 2016.Revised Monitoring <br /> and Reporting Program R5-2015-0012-013 for In-Situ Groundwater Remediation,Lincoln Village Shopping Center, <br /> Stockton,San Joaquin County.22 August <br /> engineers I scientists I innovators <br />