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I' <br /> 1; SECOR vA.wa.secor.corn <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> INCORPORATED Rancho-Cordova,CA 95670 <br /> ECOR916-861-0400 TEL <br /> 916-861-0430 FAX <br /> ECEN-0 <br /> October 12, 2007 U u <br /> p C T 1 7 2007 <br /> Mr. Michael Infurna ENViRO!`.MENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT!SERViCES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: Corrective Action Plan <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Road <br /> Stockton, California <br /> SECOR Project No.: 77EL.14117.07.0515 <br /> Dear Mr. Infurna: <br /> SECOR International Incorporated (SECOR), on behalf of 7-Eleven, Inc. (7-Eleven), <br /> presents this Corrective Action Plan (CAP) for 7-Eleven Store Number 14117, located at <br /> 2725 Country Club Boulevard in Stockton, California (Figures 1 and 2). The CAP was <br /> requested by the San Joaquin County Environmental Health Department (SJCEHD) in a <br /> letter dated June 15, 2007 (Attachment A). This report includes a brief discussion of site <br /> background and previous investigations, and recommendations for future work, including <br /> remediation of hydrocarbons dissolved in groundwater beneath the site. <br /> SITE LOCATION AND FACILITY DESCRIPTION <br /> The site is located on the north side of Country Club Boulevard west of the intersection of <br /> Country Club Boulevard and Ryde Avenue. The site is currently an operating 7-Eleven <br /> convenience store and gasoline station with two 10,000-gallon underground storage tanks <br /> (UST's) as shown on Figure 2. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> On July 17, 1998, three 10,000-gallon single-walled USTs were removed from the site. The <br /> UST excavation was extended to the east, and two new 10,000-gallon double-walled steel <br /> USTs were installed. The new tanks were installed in a tank pit located east of the original <br /> UST locations. One ten-inch diameter Schedule 40 polyvinylchloride (PVC) conductor <br /> casing was installed in the new UST pit between the new tanks for future installation of well <br /> MW-2. <br /> On September 29 and October 2, 1998, Fluor-Daniel GTI advanced six offsite (OSGP-1 <br /> through OSGP-6) and 11 onsite (GP-7 through GP-17) Geoprobe® soil borings (Table 1 <br /> and Figures 2 and 3). The offsite borings were located north of the 7-Eleven site in an <br /> apartment complex. The offsite borings did not contain detectable concentrations of <br /> petroleum hydrocarbons. The onsite borings contained benzene, total petroleum <br /> hydrocarbons as gasoline (TPHg), and methyl-tert-butyl ether (MtBE) in soil at maximum <br /> I:\7-Eleven\7-11 Stores\14117\Reports\14117 CAP 10-12-07.doc <br />