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Chevron <br /> Chevron <br /> Chevron U.S.A.Products Company <br /> 6001 Bollinger Canyon Road <br /> August 23, 1994 Building L <br /> g San Ramon,CA 94583 <br /> P0.Box 5004 <br /> San Ramon,CA 94583-0804 <br /> Ms. Mary Meays Marketing—Northwest Region <br /> San Joaquin County Environmental Health Phone 510 842 9500 <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Chevron Station#9-0557 139 South Center Street Stockton CA <br /> Attached additional site assessment report(GTI,6/28/94) <br /> Dear Ms. Meays: <br /> Attached is a report dated June 28, 1994, which was prepared by Chevron's consultant, <br /> Groundwater Technology Inc. (GTI), to describe results obtained during the drilling and sampling <br /> of five investigative soil borings on May 12-13, 1994. <br /> Five soil borings were drilled to define the extent of petroleum hydrocarbon contamination <br /> remaining in soil beneath the'site. Petroleum hydrocarbons present as TPHGas and BTEX were <br /> detected in borings SB-1, SB-3, and SB-4. The highest levels of contamination were found at <br /> forty feet below ground surface and deeper; most-notably in boring SB-4 beneath the former fuel <br /> tankpit. No petroleum hydrocarbons were detected in borings SB-2 and SB-5. Based on these <br /> latest results it appears that most of the hydrocarbons remaining in soil are limited to the area <br /> beneath the eastern-southeastern portion of the former fuel tankpit. <br /> The next phase of work will be directed at further defining soil contamination to the south of the <br /> former fuel tankpit and to further define the extent of groundwater contamination south of the <br /> subject site across Washington Street. A workplan will be submitted for approval on or before <br /> October 15, 1994. <br /> If.you have any questions or comments, I can be reached at(510) 842-8695. <br /> Sincerely, <br /> Brett L. Hunter A U G 2 9 1994 <br /> Environmental Engineer <br /> Site Assessment and Remediation ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> fzrA Recycled <br />