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Chevron <br /> r' Chevron <br /> �r <br /> "�` P:"^ n"' 12: 50 <br /> Chevron Products Company <br /> 6001 Ballinger Canyon Road <br /> Building L <br /> San Ramon,CA 94583 <br /> P.O.Box 6004 <br /> July 29, I999 San Ramon,CA 94583-0904 <br /> Marketing—Sales West <br /> Phone 510 842-9500 <br /> Mr.Ron Rowe <br /> San Joaquin County Public Health Services <br /> 304 East Weber Ave.,Third Floor <br /> Stockton,CA 95202 <br /> Re: Chevron Station#9-8264 3775 Tracy Blvd.,Tracy,CA <br /> Attached Underground Storage Tank Unauthorized Release Site Report(7/29/99) <br /> Dear Mr.Rowe: <br /> The following and attached documentation are being submitted to fulfill release reporting requirements in <br /> accordance with California Code of Regulations Title 23,Division 3,Chapter 16,Article 5, Section 2652. <br /> The information provided below corresponds to each of the designated subsections within Section 2652: <br /> 2652(b) Indications of an unauthorized release were witnessed during groundwater monitoring activities <br /> on June 1, 1999 by a representative from San Joaquin County Public Health Services(Harlin <br /> Knoll)and by a representative from Blaine Tech Services(Brooks Taylor).There was 0.1 feet <br /> of gasoline measured upon the groundwater surface in monitoring well MW4.A sample of the <br /> recovered gasoline was sent to Chevron's Research Laboratory in Richmond,CA for fuel <br /> identification.Analytical results were received on July 19, 1999.Confirmation that the gasoline <br /> sample was a Chevron product was received on July 20, 1999.The presence of a proprietary fuel <br /> tracer in the sample confirmed the product was Chevron's and indicated the release occurred within <br /> the last six months. Chevron notified San Joaquin County Public Health Services(Steve Sasson)of <br /> the confirmed release on July 28, 1999. <br /> On June 1, 1999 0.05 gallons of gasoline were removed from the groundwater surface.Additional <br /> product removal has been scheduled for July 30, 1999.Investigation of the release was performed on <br /> July 22, 1999 by Chevron maintenance and compliance representatives.There was no evidence that <br /> the fuel containment/distribution system had failed or that its integrity was breached.Upon <br /> inspection of monitoring well MW4 it was found that the PVC casing was not capped.Based on <br /> these field observations,it was assumed that the gasoline entered the wellbore from a surface spill. <br /> Immediate measures to stop the release were taken by replacing the well cap.No emergency <br /> conditions were present. <br />