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i A <br /> Califoregional Water Quality Strol Board <br /> Qa; Central Valley Region <br /> Katherine Hart,Chair <br /> Linda S.Adams Arnold <br /> 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 <br /> Secretan jor Schwarzenegger <br /> Enrirownental Protection Phone(916)464-3291 •FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralvalley Governor <br /> 18 August 2010 <br /> Chevron Environmental Management Company <br /> c/o Peter Zawislanski <br /> Arcadis <br /> 100 Montgomery Street, Suite 300 <br /> San Francisco, CA 94104 <br /> COMMENTS ON 401 NORTH SAN JOSE STREET INVESTIGATION WORK PLAN, <br /> STOCKTON WATERFRONT, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Regional Board) staff has reviewed the <br /> report entitled "Site Investigation Work Plan"prepared by Arcadis on behalf of Chevron <br /> Environmental Management Company dated 30 July 2010. <br /> Background <br /> The site was owned and operated by Texaco as a bulk fuel terminal from an unknown date <br /> until approximately 1979. Texaco reportedly sold the property in 1984. The property has been <br /> sold several times since then; most recently to a private party who took title as a result of a <br /> foreclosure sale. <br /> In 2002, a Phase 2 environmental assessment of the site was completed on behalf of the <br /> property owner at that time, Mr. Richard Navone. The investigation included the installation of <br /> ten boreholes in the areas known to previously contain petroleum facility features. Soil and <br /> groundwater samples were collected from each of the ten boreholes. Each sample was <br /> analyzed for petroleum range hydrocarbons (TPH) and fuel oxygenates (BTEX). Elevated <br /> levels of TPH and BTEX were found in multiple soil and groundwater samples. The <br /> concentration of gasoline and diesel in groundwater water indicate the presence of free <br /> product (1,090,000 pg/L TPHg at GP-8) <br /> Comments <br /> The work plan discusses the necessity for additional site characterization, which includes: <br /> completion of a geophysical survey, advancing ten cone penetrometer borings (CPT) with <br /> laser induced fluorescence (LIF), installation of four groundwater monitoring wells, and <br /> collection of shallow soil samples. Regional Board staff understands that the proposed <br /> investigation activities are limited in scope and that additional investigations are likely to be <br /> needed based upon the results of these proposed investigations. Some of the comments <br /> below are directed at what may be expected in subsequent investigation phases. <br /> California Environmental Protection Agency <br /> ZaRecycled Paper <br />