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SITE INVESTIGATION WORK PLAN February 1996 Den's Auto 308 South El Dorado Street Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the 'request of Mr. Den Ueda of Den' s Auto Repair, Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Site Investigation Work Plan for 308 South El Dorado Street in Stockton, California (the site). The scope of work includes the advancement of six soil borings/probings and collection of soil and ground water samples. The location of the site is illustrated on Figure 1 =Location Mal?. A plan of the site is illustrated on Figure 2 - Site Plan. This Work Plan is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for investigation of underground storage tank(UST) sites. 2.0. BACKGROUND 2.1. SITE DESCRIPTION The site is located in an commercial/industrial area of south Stockton at the southeast corner of the intersection of South El Dorado Street and East Lafayette Street. A single structure is located on the property and is currently.occupied by an auto repair facility. 2.2. UNDERGROUND STORAGE TANK REMOVAL On 25 and 26 May 1995, four USTs and associated piping were removed from the site by Valley Environmental Solutions(VES)of Stockton, California. One 8,000-gallon regular gasoline UST, one 7,000-gallon gasoline UST and one 5,000-gallon gasoline UST were removed from a large excavation located on north of the building; a single 500-gallon waste oil UST was removed from an excavation located on the south side of the building(Figure 2). Upon removal of the USTs, soil samples were collected from beneath each UST, piping areas and excavated soil. Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected in the soil samples at concentrations up to 9,100 part per million(ppm) in sample TK3-N, collected from the northern boundary of the property. Analytical results of the soil samples collected during May 1995 are displayed in Table 1. Based upon the results of the UST sampling, the PHS-EHD has required additional investigation of the site to determine the lateral and vertical extent of hydrocarbon-impacted soil and/or ground water.