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C A M B R I A <br /> October 15, 1998 <br /> Mr. Jeffrey Wong <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re: Site Investigation Work Plan <br /> Shell-branded Service Station <br /> 880 Victor Road <br /> © Stockton, California <br /> WIC #204-4416-0806 <br /> Dear Mr. Wong: <br /> This work plan was prepared by Cambria Environmental Technology, Inc. (Cambria) on <br /> behalf of Equiva Services LLC (Equiva) in response to a September 9, 1998 letter issued by <br /> San Joaquin County Public Health Services (SJCPHS) for the above referenced site (Plates I <br /> and 2). SJCPHS requested submittal of a work plan to delineate the vertical and lateral extent <br /> of methyl-tertiary-butyl-ether (MTBE) in the vicinity of the underground fuel storage tank <br /> (UST) complex. The scope of work presented in this work plan will comply with SJCPHS <br /> and Regional Water Quality Control Board (RWQCB) guidelines. <br /> SITE BACKGROUND <br /> Site Description: The site is currently an operating gasoline station located on the southeast <br /> corner of the intersection of Victor Road and Beckman Road in Lodi, California (Plates I & <br /> 2). The site layout consists of a service station building, two dispenser islands, a UST <br /> complex, and a waste oil tank. <br /> Previous Investigation: During December 1994, four single-walled steel USTs (two 10,000 <br /> gallon and two 6,000 gallon) were removed along with associated product piping. Soil <br /> Oakland, CA samples collected from beneath the former dispenser islands and product piping did not <br /> Sonoma, CA contain detectable concentrations of petroleum hydrocarbons. Petroleum hydrocarbons were <br /> Portland, OR detected in soil samples collected from the former UST excavation. Over-excavation was <br /> Seattle, WA performed and additional soil samples were collected. Soil sample TP-1, collected at 21 feet <br /> Cambria below grade (tbg) contained 1,000 parts per million (ppm) of Total Purgeable Petroleum <br /> Environmental Hydrocarbon (TPPH), and soil sample EN-2NSW, collected at 17 fbg, contained 0.024 ppm <br /> Technology, Inc. xylenes. Complete results of the UST removal are documented in the Fugro West, Inc., April <br /> 270 Perkins Street 19, 1995 Underground Storage Tank Closure Report. <br /> P.O. Box 259 <br /> Sonoma, CA 95476 <br /> Tel(7o7)935-4850 <br /> Fax(7o7)935-6649 <br />