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r I irrr , <br /> t� <br /> CAMBRIA �'7 " ' <br /> t f <br />• JL. ! r9 21 <br /> June 16, 2000 <br /> Mr Ronald Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Re Soil Vapor Extraction System Evaluation <br /> Former Texaco Service Station <br /> 440 W Charter Way <br /> Stockton, California <br /> Dear Mr Rowe <br /> Cambria Environmental Technology, Inc (Cambria) prepared this Soil Vapor Extraction <br /> System Evaluation to assess the effectiveness and potential enhancement of the soil vapor <br /> extraction (SVE) system at the site referenced above This evaluation is being conducted on <br /> behalf Equiva Services LLC Presented below are the site background, system design, system <br /> evaluation, and conclusions This evaluation is limited by the means with which previous <br /> consultants collected and maintained system information and data <br /> i <br /> SITE BACKGROUND <br /> The site is a former Texaco service station, located at 440 West Charter Way in Stockton, <br /> California (Figures 1 and 2) This site was sold on December 27, 1999 by Equilon Enterprises <br /> LLC, and is now operated as a service station by the new owner The subject site is located in <br /> a mixed residential and commercial area of southern Stockton Texaco began retailing <br /> gasoline at the site in about 1960 Six other nearby sites have or had underground fuel <br /> storage tanks (USTs) and are also being investigated <br /> In October 1988 during construction activities, hydrocarbon impacted soil was observed <br /> beneath two pump islands Samples collected by Groundwater Technology, Inc (G 11) of <br /> Oakland CA West Sacramento, California verified the observed hydrocarbon impact In April 1992, GTI <br /> San Ramon CA drilled four 12-inch diameter soil borings Two vapor extraction wells, with differing <br /> Sonoma CA screened intervals, were installed in each boring In June 1992, GTI conducted a SVE Pilot <br /> Portland OR <br /> test using the newly installed vapor extraction wells Based on the results of the pilot test, <br /> Cambna Science & Engineering Analysis Corporation (SEACOR) proposed installation of a SVE <br /> Environmental system in September 1993 Installation of the system began in September 1994 The SVE <br /> Technology,Inc <br /> system consisting of a thermal oxidizer connected to the four SVE wells was started on <br /> 0 Perkins Street <br /> P 0 Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4950 <br /> Fax(707)935-6649 <br />