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SOIL VAPOR TESTING REPORT '' r for California Department of Transportation � ��t"� 1 i +t Fit- Shop 10 Facility 1603 South B Street Stockton, California ]project Number 42-0024 September 18, 1992 INTRODUCTION This report presents the results of soil vapor testing activities conducted at the Caltrans Shop 10 Facility, 1603 South B Street, Stockton, California. This test was performed in accordance with the requirements and guidelines of the San Joaquin County Public Health Department (SJCPHD) and the Bay Area Air Quality District. Test results are used to estimate the air extraction rates, approximate the vacuum radius of influence, and the influent hydrocarbon vapor concentrations. Test results will be used to design the extraction well field array, cumulative flow rate capacity of the treatment equipment, and the type of treatment technology The vapor extraction remediation system (VES) will be designed to • recover hydrocarbons by creating a zone of vacuum to generate air flow through the unsaturated zone BACKGROUND Site Description The site is situated at an approximate elevation of 21 feet above mean sea level (msl), as shown in Figure 1, Site Vicinity Map. Caltrans Shop 10 Facility is located across the street, to the west of the Caltrans Stockton Maintenance Facility and south of the San Joaquin County Fairgrounds (Figure 2). Other properties adjacent to the site are primarily commercial and residential developments Mormon Slough, the nearest surface body of water in the area, is located approximately 1,000 feet north of the site. Duck Creek is approximately 1-1/2 miles south of the site A summary of the results of subsurface investigative work performed at the site are summarized below o Review of subsurface geology indicates the site is underlain by predominately silty sand and poorly-graded sand with interbedded silty sand and silty clay units