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SECOR <br /> International incorporated <br /> March 20, 2001 — <br /> Project 077.43508.570 i ' ' � � <br /> Ms. Lori Duncan <br /> San Joaquin County Department of Environmental Health <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95201 <br /> Re: Commingled Plume Concurrence <br /> Chevron Service Station#9-4275 ARCO Service Station #2133 <br /> 2905 West Benjamin Holt Drive 2908 West Benjamin Holt Drive <br /> Stockton, California Stockton, California <br /> Dear Ms. Duncan: <br /> SECOR International Incorporated (SECOR) has prepared this letter on behalf of Chevron <br /> Products Company(Chevron) and Atlantic Richfield Corporation (ARCO) to request the <br /> San Joaquin County Department of Environmental Health's (SJCDEH) concurrence with <br /> SECOR's determination that the historic petroleum hydrocarbon_releases from each site are <br /> now commingled. This determination is based upon a review of the data from the <br /> historical releases of petroleum hydrocarbons (including MtBE) and verified through joint <br /> groundwater monitoring for several years. Recent data shown on Figure 1 suggests the <br /> MtBE plumes at the sites have commingled and cannot be distinguished. Chevron and <br /> ARCO have entered into an agreement to assess and remediate the MtBE plumes as a <br /> commingled plume and have applied for funding from the UST Cleanup Fund. One <br /> requirement for eligibility into the UST Cleanup Fund is the oversight agencies <br /> concurrence with commingled plume status. Chevron and ARCO request that SJCDEH, as <br /> the oversight agency,concur that the plumes are commingled and that SJCDEH write a <br /> letter of concurrence with the commingled plume status. An example of such a letter is <br /> included as Attachment A. <br /> If you have any questions or require additional information, please do not hesitate to call <br /> me at(916) 861-0400. <br /> Sincerely, <br /> SECOR InternationVr-orported <br /> Rusty E. Benkosky, P <br /> Project Manager <br /> Attachments: Figure 1 - MtBE Isoconcentration Map December 14 & 15, 2000 <br /> Attachment A—North Coast RWQCB Letter Dated March 5, 1997 <br /> cc: Mr. Bob Cochran, Chevron Products Company <br /> Mr.Paul Supple, ARCO <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />