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SITE INVESTIGATION WORK PLAN February 1996 Country Mart 34243 South Chrisman Road Tracy, California 1.0. INTRODUCTION In accordance with a request from Mr. Pushpinder Singh,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Site Investigation Work Plan for 34243 Southi Chrisman Road in Tracy, California (the site). The scope of work includes the drilling and sampling of four soil borings. The location of the site is depicted in Figure 1- Location Map. A plan of the site and the proposed penetration locations is illustrated in Figure 2 -Site Plan. The proposed investigation is performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND 2.1. SITE LOCATION The site is located in a flat rural/agricultural area south of Tracy, California, approximately one- quarter of a mile northeast of the intersection of State Highway 132 and Interstate 580 (Figure 1). The California Aqueduct is located approximately one-quarter of mile north of the site. The property is currently occupied by a single building and operates as a mini-mart/truck stop. 2.2. UST REMOVAL It is our understanding that three underground storage tanks(USTs), dispenser islands and associated piping were removed from the site in January 1995. Hydrocarbon-impacted soil was detected in samples collected beneath the USTs and piping/dispenser areas. 2.3. EXCAVATION OF HYDROCARBON IMPACTED SOIL In February 1995, an additional 75 cubic yards of soil was removed from the former UST area. Soil was excavated to a depth of 31 feet and a soil sample was collected from the floor of the excavation. Total petroleum hydrocarbons (TPH-g) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X)were detected at concentrations up to 240 parts per million (ppm) from the floor of the excavation.