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i; ALTH chevMn <br /> r NO Chevron <br /> '�"i!'�(1"=i^;'.iii,�.� , <br /> 95 FES 21, PM 1' 19 <br /> '" Chevron USA Products Company <br /> 6001 Bollinger Canyon Rd., Bldg. L <br /> February 21, 1995 P.O. Box 5004 <br /> San Ramon, CA 945BUB04 <br /> Site Assessment& Remediation Group <br /> Ms. Mary Meays Phone (510)842-9500 <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron Station#9-1918. 45 East Harding Way Stockton CA <br /> Attached Workplan For Additional Soil Investigation (GTI, 2/14/95) <br /> Dear Ms. Meays: <br /> Please find attached a workplan dated February 14, 1995, which was prepared by Chevron's <br /> consultant, Groundwater Technology, Inc. (GTI) which describes the drilling and sampling <br /> procedures associated with the drilling of four confirmatory soil borings at the subject site. The <br /> work proposed by GTI in their workplan supplements the action plan described in my letter to your <br /> agency dated, January 30, 1995. The soil samples collected by GTI will not only add further <br /> definition to the extent of hydrocarbons remaining in soil but, will also be analyzed for the purpose <br /> of demonstrating that residual hydrocarbons are not an existing threat to groundwater quality. <br /> The collected soil samples will be analyzed for the presence of TPHG and BTEX constituents by <br /> EPA methods 8015 and 8020, respectively. The final boring and sample locations will be subject to <br /> the approval of the San Joaquin County Public Health Services (SJCPHS). The results of BTEX <br /> analyses will be used to better define the mass of hydrocarbons remaining and to provide input data <br /> to SESOIL to model the transport of contaminants in the vadose zone. All SESOIL model input <br /> parameters will be pre-approved by SJCPHS. Similarly, the results of TPHG analyses will add <br /> definition to the mass of hydrocarbons remaining but, will also be used to screen samples for <br /> additional leaching analyses by the Toxicity Characteristic Leaching Procedure(TCLP). <br /> If you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> cc: Elizabeth Thayer, Central Valley RWQCB, Sacramento, CA <br /> Carolyn Lawrence, 6318 Chesapeake Circle, Stockton, CA 95219 <br /> Michael F. Babitzke, 6 South EI Dorado, Suite 305, Stockton, CA 95202 <br /> Bette Owen, Chevron USA, Products Company, San Ramon, CA (w/o attachment) <br />