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SECOR <br /> International Incorporated <br /> February 2, 2001 <br /> Project 077.43025.001 <br /> Mr. Harlin Knoll <br /> San Joaquin Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95201-0388 <br /> Re: Limited Initial Site Assessment Report <br /> Vacant Lot <br /> NW Comer of MacArthur Drive &Valpico Road <br /> Tracy, California <br /> Dear Mr. Knoll: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Chevron Products Company(Chevron), presents the results of the initial site assessment <br /> activities involving the sampling and laboratory analysis of five soil borings drilled <br /> under the direction of Korbmacher Engineering, Inc. (KEI) at the site referenced above <br /> (Figure 1). The purpose of the work was to establish baseline conditions as they relate <br /> to possible impact to soil beneath the proposed site by petroleum hydrocarbons and fuel <br /> oxygenates. The work was performed in conjunction with Korbmacher Engineering's <br /> Geotechnical investigation of the site. <br /> ASSESSMENT ACTIVITIES AND FINDINGS <br /> On November 15, 2000, five soil borings (SB-1 through SB-5) were advanced onsite by <br /> Bay Area Exploration of Susan City, California, under the direction of KEI. A SECOR <br /> geologist was onsite to witness the drilling event and take samples for laboratory <br /> analysis. Boring logs are presented as Attachment A, included in KEI's Geotechnical <br /> Study, dated December 4, 2000. <br /> The findings of this assessment are discussed below: <br /> • Subsurface Conditions. Primarily sandy silts with some clay were <br /> encountered by KEI to approximately 24.5 feet below ground surface <br /> (bgs). Gravelly sand was encountered in SB-5 at 24.5 feet bgs, and <br /> extended to the bottom of the deepest boring at 26.5 feet bgs. <br /> Groundwater was not encountered in any of the soil borings. <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />