ARCHIVED REPORTS XR0010135 - Laserfiche WebLink

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1.0 INTRODUCTION The U.S. Environmental Protection Agency (EPA), Region IX, under the authority of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) and the Superfund Amendments and Reauthorization Act of 1986 (SARA), has tasked Bechtel Environmental, Inc. (BEI) to conduct a preliminary assessment (PA) of Cox and Cox Property (Cox&Cox) site in Tracy, San Joaquin County,Calif. The purpose of the PA is to review existing information on the site and its environs to assess the threat(s), if any, posed to public health, welfare, or the environment and to determine if further investigation under CERCLA/SARA is warranted. The scope of the PA includes the review of information available from federal, state, and local agencies. and performance of an onsite reconnaissance visit. Using these sources of existing information, the site is then evaluated using the EPA's Hazard Ranking System (HRS) criteria to assess the relative threat associated with actual or potential releases of hazardous substances at the site. The HRS has been adopted by the EPA to help set priorities for further evaluation and eventual remedial action at hazardous waste sites. The HRS is the primary method of determining a site's eligibility for placement on the National Priorities List (NPL). The NPL identifies sites at which the EPA may conduct remedial response actions. This report summarizes the findings of these preliminary investigative activities. Cox & Cox was identified as a potential hazardous waste site and entered into the Comprehensive Environmental Response, Compensation, and Liability Information System (CERCLIS) on - September 27, 1992 (CAD 983649294) (1). 1.1 Apparent Problem The apparent problem with the site is as follows: • For approximately 46 years the Cox & Cox site operated as a service station. Following the removal'of underground storage tanks on site, lead was detected in soil samples collected from the excavation pit of a former waste oil tank at concentrations up to 25 milligrams per kilogram (mg/kg) (2). A groundwater sample obtained from an onsite monitoring well indicated the presence of lead in groundwater at a concentration of 0.16 milligrams per liter(mg/1) (3). 2.0 SITE DESCRIPTION 2.1 Location The Cox & Cox site occupies 5071 595, and 599 East Eleventh St. in Tracy, San Joaquin County, Calif. Tracy lies on the western boundary of the Sierra Nevada foothills, approximately 60 miles southeast of San Francisco. The geographic coordinates of the site are 37°44'24-0" N latitude and 1210 24' 50.0" W longitude (Township 2 South, Range 5 East, Section 22, Mount Diablo Baseline and Meridian, Tracy, Calif., 7.5-minute quadrangle) (4). The location of the site is shown in Y Figure 2-1. PA Cox&Cox-BB•9193 1 Printed on 50%recycled ptper.