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SECOR -- --- <br />3017 Kilgore Road, Suite 100 <br />Rancho Cordova, CA 95670 <br />916-861-0400 TEL <br />916-861-0430 FAX <br />September 24, 2004 <br />���� <br />i� r <br />Mr. James L. Barton C J; <br />California Regional Water Quality Control Board �' <br />11020 Sun Center Drive Suite #200 SEP 2 7 2004 <br />Rancho Cordova, California 95670-6114 ENVIRONMEIVT <br />HE <br />PERMIT/OERVICES rH <br />RE: Work Plan for Hydrogen Peroxide Bench -Scale Study <br />Former Chevron Service Station 9-5775 <br />301 West Kettleman Lane <br />Lodi, California <br />SECOR Project No.: 77CH.95775.06.0670 <br />Dear Mr. Barton: <br />SECOR International Incorporated (SECOR), on behalf of Chevron Environmental <br />Management Company (Chevron), presents this work plan for a hydrogen peroxide bench - <br />scale study for the above -referenced site. The purpose of bench -scale testing is to <br />evaluate the effects of hydrogen peroxide injection into the aquifer. The bench -scale study <br />has been proposed in order to obtain approval by the Regional Water Quality Control Board <br />(RWQCB) to begin hydrogen peroxide injection as described in SECOR's Hydrogen <br />Peroxide Injection Work Plan, dated April 14, 2004. This Work Plan has been prepared in <br />response to a request by the RWQCB in their letter, dated May 13, 2004 (Attachment 1). <br />This Work Plan includes a brief site description, scope of work, and schedule. <br />SITE DESCRIPTION <br />The subject site is a former Chevron branded service station located at 301 West Kettleman <br />Lane in Lodi, California (Figures 1 and 2). Former facilities included four service bays, <br />three dispenser islands, one sales kiosk, three 10,000 -gallon gasoline underground storage <br />tanks (LISTS), one 1,000 -gallon used -oil UST, one 550 -gallon previously abandoned used - <br />oil UST, and one hydraulic hoist. A Prime Shine Express Car Wash and Auto Lubrication <br />Center is currently operated at the site. The area surrounding the site is used and zoned <br />for mixed commercial and residential use. Topography in the area of the site is relatively <br />flat, with an elevation of approximately 45 feet above mean sea level (msl). The nearest <br />receptor is a City of Lodi Municipal Well 12 (Well 12) located approximately 350 feet <br />downgradient from the site. <br />The station has been actively remediated using groundwater extraction (GWE) and soil <br />vapor extraction (SVE) for a period of approximately four years. Influent SVE <br />concentrations of hydrocarbons were non -detect and mass removal reached asymptotic <br />levels prior to shutdown of the SVE system in 2003. The GWE system is currently <br />operating and maintaining hydraulic control of dissolved petroleum hydrocarbons remaining <br />onsite including methyl tertiary butyl ether (MtBE). <br />I:\Chevron\95775\REPORTS\2004\Bench Scale Study(Mod).doc <br />