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"COR : <br /> sAEJ <br /> International Incorporated <br /> March 21, 2001 <br /> Project 077.41991.007 <br /> Mr. Ron Rowe <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95201-0388 <br /> Re: Site Assessment <br /> Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> Site Code: 1039 <br /> Dear Mr. Rowe: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> Chevron Products Company (Chevron), presents the results of site assessment activities <br /> performed September 5th through 9th, 2000. The purpose of this work was to further <br /> characterize the hydrogeology in the site area and evaluate the lateral and vertical extent <br /> of hydrocarbons in groundwater onsite and offsite. The data gathered from this phase of <br /> work will be utilized in locating future groundwater monitoring wells offsite and for <br /> determining the depth of those wells. <br /> SITE BACKGROUND AND PREVIOUS INVESTIGATIONS <br /> The site is an operating Chevron Service Station located on the northwest corner of <br /> Washington Street and South Center Street in Stockton, California, and is within an area <br /> of primarily commercial use (Figures 1 and 2). Topography in the area of the site is <br /> relatively flat, and is approximately 12 feet above mean sea level. The nearest surface <br /> water bodies are the Mormon Slough located approximately 114-mile south of the site, <br /> the Yacht Harbor located approximately 114-mile north of the site, and the Port of <br /> Stockton located approximately one mile west of the site. The Highway 4 overpass is <br /> located south of the site across Washington Street. <br /> As previously reported by Groundwater Technology, Inc. (GTI), the site has been <br /> operated as a retail gasoline station since 1969. In April 1990, the existing single- <br /> walled steel underground storage tanks (USTs) and associated piping were removed <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />