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Preliminary Site Assessment Work Plan MUNICIPAL SERVICE CENTER 1465 South Lincoln Street, Stockton, California 1.0. INTRODUCTION At the request of the City of Stockton,Advanced GeoEnvironmental, Inc. (AGE)has prepared this Work Plan for investigation of the Municipal Service Center site located at 1465 South Lincoln Street, Stockton, California(Figure 1). The purpose of the preliminary site assessment is to assess the vertical and lateral extent of petroleum hydrocarbon impact to soil encountered during the removal of USTs in April 1995. This work plan provides the scope of work and procedures for advancement of soil probe borings, collection of soil and groundwater samples, laboratory analysis of samples, and soil boring abandonment. This work plan has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and was prepared in accordance with the Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is located at 1465 South Lincoln Street in Stockton, California (Figure 1). The parcel is located in the northwest portion of Section 14 of Range 6 East, Township 1 North, Mount Diablo Base and Meridian (MDB&M). 2.1. SITE DESCRIPTION The property is located in an industrial and commercial area of southern Stockton. The property is presently occupied by the City of Stockton Municipal Service Center, which consists of three one- story structures housing an office, maintenance garage, lunchroom, miscellaneous shops, and a gasoline fueling facility consisiting of two dispenser islands with four gas dispensers. 2.2. UNDERGROUND STORAGE TANK REMOVAL On 21 April 1995, one 12,000-gallon unleaded gasoline UST, one 12,000-gallon leaded gasoline UST, and one 12,000-gallon diesel UST were removed from the site. Soil samples were collected from beneath each UST, and from the excavated soil. The samples were transported to a DHS- certified laboratory and selected samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), total petroleum hydrocarbons quantified as diesel (TPH-d), total petroleum hydrocarbons gauntif ed as motor oil (TPH-mo),volatile aromatics(benzene,toluene,ethyl benzene, and total xylenes: BTEX), and total lead in accordance with the appropriate EPA Methods. Advanced Geo Environmental,Inc.