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4 <br /> SECOR <br /> International Incorporated <br /> eLL� <br /> Tf <br /> August 8, 2001 <br /> Project 077.43235.010 <br /> —o <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services N <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Supplemental Data <br /> Request for Commingled Plume Status <br /> ARCO Station#2133 and Chevron Station#9-4275 <br /> 2905 and 2908 Benjamin Holt Drive <br /> Stockton, California <br /> Dear Ms. Duncan: <br /> SECOR International incorporated (SECOR), on behalf of ARCO Products Company <br /> �- and Chevron Products Company, provides with this letter supplemental data supporting <br /> our request for commingled plume status at the subject sites (Figure 1). SECOR <br /> previously requested commingled plume status in a letter to San Joaquin County dated <br /> March 20, 2001. <br /> San Joaquin County Public Health Services, Environmental Health Division (the <br /> County) acts in a Local Oversight Program (LOP) role for both ARCO and Chevron <br /> sites, which have had historic, separate releases and which have both engaged in <br /> remedial activities to cleanup soil and groundwater. This letter is intended to provide <br /> the County with the supplemental data that supports our request for commingled plume <br /> status. SECOR requests that the County, in turn, supports our request and advises the <br /> State Water Resources Control Board (SWRCB) cleanup fund section (Fund) of the <br /> merits of the commingled plume status. <br /> BACKGROUND <br /> ARCO #2133 <br /> Four underground storage tanks (USTs) and associated product lines and dispensers are <br /> present at the site. A release from a piping leak was discovered in 1984. A release of <br /> approximately 2,000 gallons of gasoline was reported in May 1989, and an unknown <br /> quantity of fuel was released at the northern dispenser island in 1995. Twenty <br /> L%ARC0121331Misc Letters\Commingled letter Revision O.doc <br /> 3017 Kilgore Road suite 100, Rancho Cordova, CR 95670 916.861.0400 916.861.0430 Fax www.secorxom <br />