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r� Shaw Environmental, Inc. <br />1326 North Market Boulevard <br />Sacramento CA 95834-1912 <br />`OQ6 916-928-3300 <br />pE� 1 FAX: 916-565-4356 <br />Shaw® Shaw Environmental, Inc. � r,As <br />December 14, 2006 <br />To: Mrs. Lori Duncan <br />Mr. Nuel Henderson <br />Environmental Health Department <br />San Joaquin County <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202-2708 <br />cc: Mr. Don Rodgers <br />Mr. James Barton, Central Valley Regional Water Quality Control Board <br />Encl: Attachment 1, 2006 Fax — San Joaquin County Environmental Health Department (8 pages) <br />Subject: The Transmission Shop, 515 Charter Way, Stockton, California 95209 (Site Code: 9321) <br />Dear Ms. Duncan & Mr. Henderson: <br />Thank you for your letter of October 13, 2006. Shaw Environmental, Inc. (Shaw) provides the following <br />response to key items of the letter and notes our recommendations for the next tasks of site work below. <br />Inquiry for Information about Potential Waste Oil Tank <br />Information about the former Waste Oil Tank (WOT) shown on drawings in Shaw's August 23, 2006, report <br />was taken from records supplied to Shaw by the SJC-EHD. A copy of that information is attached (1 page <br />sketch map, 6 pages of laboratory reports, and 1 page chain -of -custody). Neither Mr. Don Rodgers nor Shaw <br />have further information about the alleged existence or location of that tank, nor did Shaw see physical <br />indications of an excavation or backfill repair in that area of the site. <br />Soil Vapor Extraction <br />The site Soil Vapor Extraction (SVE) system is mothballed, and neither the site owner/responsible party nor <br />the State of California UST Reimbursement Fund is being billed for the unit. <br />Shaw recommends evaluating the potential risk for inhalation of soil vapors to persons at the Transmission <br />Shop and nearby properties before making a final determination about the fate of the site SVE system. The <br />system was operated to remediate vadose (unsaturated) soil, and use of the MIP and PID by Shaw in 2006 <br />(see August 23, 2006, report by Shaw) indicates that the vadose zone may now be sufficiently devoid of <br />mobile hydrocarbons so as to no longer threaten groundwater quality. However, benzene and other volatile <br />gasoline constituents in site groundwater are likely to follow diffusion gradients into soil vapor and potentially <br />into buildings and may present inhalation health risks. <br />