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R . <br /> S <br /> Fes` <br /> LE SECOR <br /> 411T S,`,'v 11Q EInternational Incorporated <br /> December 29, 1997 �s '� p1' <br /> Mr: Ronald Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Work Plan for Offsite Assessment Activities <br /> Chevron Station #9-8264 <br /> 3775 Tracy Boulevard <br /> Tracy, California <br /> SECOR Project No. 7GO07-002-01 <br /> Dear Mr. Rowe: <br /> SECOR International Incorporated (SECOR)has prepared this letter on behalf of <br /> Chevron Products Company (Chevron), which presents a work plan for offsite <br /> assessment activities east of,the subject site(Figure 1). This work plan has been <br /> prepared in response to your letter, dated November 21, 1997. <br /> As you indicated during our telephone conversation on December 23, 1997, the site is <br /> likely within an area underlain by a commingled plume resulting from past documented <br /> releases on and surrounding the site. The purpose of the work proposed in this work <br /> plan is to investigate the lateral and vertical extent of previously reported hydrocarbons <br /> in soil and groundwater downgradient of the potential source areas on the subject site, <br /> ,and to gain additional hydrogeologic information near the site. This information <br /> combined with a file review and records research performed for the subject site and a <br /> review of County's files of work performed for the nearby sites will-be utilized to <br /> determine the need for additional investigative work onsite and Chevron's relative <br /> contribution to the existing hydrocarbon plume(s)beneath the site area. <br /> This work plan includes a brief discussion of site background,previous investigations, <br /> proposed scope of work, and schedule. Field and laboratory procedures are outlined in <br /> i <br /> Attachment A. <br /> f <br /> 3050 Fite Circle, Suite 204,.Sacramento, CA,95827 (916)364 1880(916)364--1889 FAX www.secorcom <br />