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SECOR <br />International Incotpol atecl <br />January 18, 2001 <br />Project 077.41991.018 <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 Report <br />Chevron Service Station #9-2033 <br />508 West Charter Way <br />Stockton, California <br />Dear Mr. Rowe: <br />SECOR International Incorporated (SECOR) has prepared this letter on behalf of <br />Chevron Products Company (Chevron) to document the findings and results of <br />assessment activities at the site referenced above (Figure 1). The purpose of this work <br />is to further evaluate the vertical extent of petroleum hydrocarbons in the soil and <br />groundwater. The site assessment included drilling three soil borings onsite to further <br />define lithology. Discrete interval groundwater samples were collected from various <br />depths within the borings. Work was performed in accordance with the December 9, <br />1997 Work Plan for Site Assessment Activities, by Pacific Environmental Group Inc. <br />SITE BACKGROUND AND PREVIOUS INVESTIGATION <br />The site is an operating Chevron Service Station located in a primarily commercial area <br />at the intersection of West Charter Way and South Lincoln Street in Stockton, <br />California. A Texaco Service Station operates directly east of the site (across Lincoln <br />Street), and an operating ARCO Service Station is northeast of the site across the <br />intersection. The City of Stockton maintenance yard to the south is reported to have, or <br />have had, one or more underground storage tanks (USTs). <br />Chemicals of concern at the site include total petroleum hydrocarbons calculated as <br />gasoline (TPHg); aromatic hydrocarbons including benzene, toluene, ethylbenzene, and <br />xylene (BTEX); and oxygenates, including methyl tertiary butyl ether (MtBE), tertiary <br />3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.com <br />