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SECOR www secor corn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> • 916-861 0430 FAX <br /> August 31, 2005 F SFA a� <br /> 200S <br /> Mr Harlin Knoll S<cR��Fs�Th� <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue <br /> Stockton, California <br /> Re SVE Well Installation and SVE Pilot Test Report <br /> Circle K Store#08671 <br /> 8606 Thornton Road <br /> Stockton, California <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR) has prepared this letter report, on behalf of <br /> ConocoPhillips to document the installation of soil vapor extraction (SVE) wells followed by <br /> the completion of a SVE pilot test at the site referenced above (Figure 1) The objective of <br /> this work was to test the effectiveness of soil vapor extraction (SVE) as a method to <br /> remediate petroleum hydrocarbon contamination in soil beneath the site and to remove <br /> hydrocarbons from the subsurface This work was performed in accordance with SECOR's <br /> Work Plan for SVE Pilot Testing and Intenm Ozone Sparging dated January 25, 2005 and <br /> the San Joaquin County Environmental Health Department (SJCEHD) correspondence <br /> approving the work plan (Attachment 1) However, the length of the SVE pilot test was <br /> reduced from the proposed five-day test (approximately 100 hr of run time) to 25 5 hours <br /> over a three day period Length of the test was reduced due to operational safety of the <br /> equipment at the site related to above ground piping to the SVE wells and traffic flow at the <br /> site <br /> SITE BACKGROUND <br /> The site is located at 8606 Thornton Road, Stockton, California The site is currently an <br /> operating gasoline service station that contains two gasoline USTs, associated product <br /> lines, and dispensers <br /> PREVIOUS INVESTIGATIONS <br /> In May 1998, product lines and dispensers were upgraded to meet 1998 EPA standards <br /> Analytical results from pea gravel samples collected from above the USTs and soil samples <br /> collected from the former product line and dispenser excavations indicated the presence of <br /> petroleum hydrocarbons in soil beneath the site The results of this work are documented <br /> in SECOR's report titled Removal and Replacement of Product Lines and Dispensers, <br /> dated July 22, 1998 During product line and dispenser upgrade activities, approximately <br /> • <br /> 1 IConocoPhiIli pslRetail Sites186711Reports18671 well install and SVE test doc <br /> s <br />