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. r a WORK PLAN FOR LIMITED ASSESSMENT OF HYDROCARBON IMPACTED-SOIL Country Mart 34243 South Chrisman Road Tracy, California August 1995 1.0. INTRODUCTION In accordance with a request from Mr. Pushpinder Singh,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan for the installation of three soil protings at 34243 South Chrisman Road in Tracy, California(the site). The location of the site is depicted in Figure"1. A plan of the site and the proposed penetration locations is illustrated in Figure 2. 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. After removal procedures, soil samples were collected from beneath each UST. Samples"collected from beneath the northern-most tank indicated that an authorized release of petroleum hydrocarbon release had occurred. Soil samples were also collected from beneath the dispenser island and piping. Two soil samples indicted that hydrocarbon impacted soil is present near the northern dispenser island. . 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).