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_ I <br /> i <br /> Geosyntec° aBroadway,6th Floor <br /> Oakland,California 94607 <br /> PH510.836.3034 <br /> consultants www.geosyntec.com 1. www:geosyntec.com <br /> 24 April 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: Offsite Characterization Work Plan <br /> Dopaco,Inc. Area <br /> 800 West Church Street, Stockton, CA 95203 <br /> GeoTracker Global ID T10000003890 <br /> Dear Mr. Barton: <br /> On behalf of Cascades, Inc., (Cascades), Geosyntec Consultants, Inc. (Geosyntec) has prepared <br /> the subject Work Plan to characterize the lateral and vertical extent of toluene in groundwater <br /> downgradient from the Dopaco, Inc. Area of 800 West Church Street, Stockton, California (the <br /> "Site"). The Site location is shown in Figure 1. <br /> BACKGROUND <br /> Geosyntec reported the results of an investigation consisting of Cone Penetrometer Test (CPT) <br /> soundings and grab groundwater sampling on the north side of Church Street on 30 July 20131. A <br /> total of five grab groundwater samples were collected from three locations to a maximum depth <br /> of 45 feet below ground surface (ft bgs). Toluene was detected in two of the five samples at 0.8 <br /> and 1.4 micrograms per liter (µg/L), and toluene was not detected at all at one of the sample <br /> locations. No other volatile organic. compounds (VOCs) were detected in the grab groundwater <br /> samples. The Central Valley Regional Water Quality Control Board (RWQCB), by letter dated <br /> 10 February 20142, indicated that additional investigation was necessary to the north of Church <br /> Street and recommended installing monitoring wells. In the DMW--5A and!)MW-SB Installation <br /> t Geosyntec,2013.. July-August 2013 Additional Investigation Report.Dopaco,Inc.Area,800 West Church Street, <br /> Stockton,California,95203.30 September. <br /> 2 RWQCB,2014.Dopaco,Inc.,800 West Church Street,Stockton,San Joaquin County Regional Board Case <br /> 391187. 10 February. <br /> Offsite Characterization Workplan <br /> engineers I scientists I innovators <br /> i <br />