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SECOR <br /> International Incorporated <br /> January 5, 2001 <br /> Project 077 43286 310 <br /> Ms Lon Duncan <br /> San Joaquin County Public Health Services JAN 0 8 2001 <br /> Environmental Health Division ENVI ,ui\JI�IENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Re Work Plan for Additional Site Assessment <br /> ARCO Station #4932 <br /> 16 East Harding Way <br /> Stockton, California <br /> Site Code: 1136 <br /> Dear Ms Duncan <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> • Atlantic Richfield Company (ARCO), presents a work plan for additional site <br /> assessment activities at the site referenced above (Figures 1 and 2) Site assessment <br /> activities will include the following work 1) installation of five offsite groundwater <br /> monitoring wells, 2) the drilling of two soil borings, 3) the performance of a 500-foot <br /> radius door-to-door well search, and 4)the performance of a conduit study The <br /> purpose of the proposed work is to assess the lateral and vertical extent of petroleum <br /> hydrocarbons in groundwater and soil beneath the site <br /> This work plan has been prepared in response to San Joaquin County Environmental <br /> Health Division (SJCEED) letter dated November 21, 2000 (Attachment A) Please <br /> note that this work plan does not propose the installation of deeply screened monitoring <br /> wells as requested by the SJCDEH in their above referenced letter SECOR requests <br /> that the vertical assessment consisting of soil borings and depth discrete samples be <br /> conducted prior to the installation of deeply screened groundwater monitoring wells to <br /> verify the necessity of deeply screened wells and to allow for the design of appropriately <br /> constructed well(s) based on the results of the discrete sampling This work plan also <br /> includes a brief discussion of site background, proposed scope of work, and schedule <br /> SITE BACKGROUND <br /> The site is located at the intersection of Center Street and Harding Way in Stockton, <br /> California, and is an operating AM/PM mini-mart and ARCO service station The site <br /> is located in mixed residential and commercial area of Stockton Facilities at the site <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax www secor com <br />