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I I I I Broadway,6th.Floor <br /> GeosMtec � Oakland,California 94607 <br /> PH 510.836.3034 <br /> consultants FAX 510.836.3036 <br /> vo. aW geosyntec.com <br /> 25 July 2013. ._ t <br /> Mr.James Barton,PG c <br /> California Regional Wate'r.Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95670-6114 <br /> r <br /> Subject: Addendum 2 to.CPT-13 Area Investigation Report and Work Plan <br /> Dopaco Area-. <br /> 800 West Church Street, Stockton, California , <br /> GeoTracker.Global ID T10000003890 <br /> Dear Mr. Barton: <br /> This letter, Addendum 2 to the CPT-13 Area Investigation Report and Work Plan (Addendum), <br /> (1) expands the scope of soil vapor sampling, '(2) clarifies the maximum soil concentrations <br /> reported in the CPT-13 Area investigation Reportand Work Plan (Work Plan), and (3) confirms <br /> the list of analytes in the forthcoming investigation in the Dopaco Area, located at 800 West <br /> Church Street, Stockton, California (the "'Site"). Geosyntec - Consultants prepared this i <br /> Addendum on behalf of Cascades, Inc. (Cascades) :in response to the California Regional Water <br /> Quality Control Board, Central Valley Region's (RWQCB) comments to the Work Plan, dated <br /> 24 July 2013: <br /> (1) Expanded Scope of Soil Vapor Sampling <br /> Comment 3 of the RWQCB's review of the Work Plan states the following: ' <br /> -In the Report, GC [Geosyntec Consultants] states additional soil gas <br /> characterization is needed to evaluate potential vapor intrusion to indoor air, due <br /> to high sub-slab levels. of toluene and benzene detected prior to building <br /> demolition. In addition, the CSM. shows the six former underground tanks <br /> extending south of the pump house.area. Additional soil vapor sampling should <br /> be proposed to verify the property is suitable for redevelopment and that all tanks <br /> Addendum 2 to CPT-13 Area Investigation Report and Work Plan <br /> engineers I scientists I innovators <br /> 9 <br /> r&'�� <br />