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i <br /> Geosyntecl�' 1akl n ,Calify,6th Floor <br /> Oakland,California 94607 <br /> PH510.836.3034 <br /> 3036 <br /> consultants FAxeosynte .com <br /> www.geosyntec.com <br /> 30 January 2014 <br /> Mr. James Barton, PG <br /> California Regional Water Quality Control Board, Central Valley Region <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br /> Subject: Work Plan to Install Groundwater Monitoring Well DMW-5B <br /> Dopaco,Inc.Area ...._-- <br /> - - 800 West Church-Street,Stockton CA 95203-. <br />- - - — GeoTracker Global ID T10000003890-- <br /> Dear,Mr.-Barton: <br /> 10000003890--Dear,Mr.-Barton. <br /> - - - This letter constitutes a Work Plan to install•a deep groundwater monitoring well-in the Dopaco;- <br /> Inc. (Dopaco) Area of 800 West Church Street in Stockton, California (the "Site"). A site <br /> location map is provided as Figure 1. This Work Plan was prepared on behalf of Cascades, Inc. <br /> (Cascades) by Geosyntec Consultants, Inc. (Geosyntec) for the purpose of delineating the depth of <br /> toluene impact to groundwater in the toluene source zone. <br /> BACKGROUND <br /> i <br /> In the July-August 2013 Additional Investigation Report', Geosyntec documented detections of <br /> toluene in grab groundwater samples from within the CPT-13 area (i.e., the secondary source <br /> area) that were collected at depths up to 85 feet below ground surface (ft bgs). Cross- <br /> contamination of these groundwater samples by shallow, toluene-impacted soil and groundwater <br /> was suspected. At present, toluene in groundwater was not been delineated with respect to depth <br /> in the secondary source area. In order to delineate the vertical extent of toluene in groundwater, <br /> Geosyntec recommended that a groundwater monitoring well (DMW-5B) be installed near CPT- <br /> I <br /> Geosyntec,2013a.July-August 2013 Additional Investigation Report,Dopaco,Inc.Area,800 West Church Street, <br /> Stockton,California 95203.Geotracker ID T10000003890.30 September. <br /> DMW-513 Monitoring Well Installation Work Plan <br /> engineers I scientists I innovators <br />