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r Y r WORK PLAN FOR LIMITED ASSESSMENT OF HYDROCARBON IMPACTED SMI.. Country Mart . 34243 South Chrisman Road T.--aen California November 1995 1.0. L TRODUCT1ON In accordance with a request from Mr. Pushpinder Singh,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Work Plan for the installation of three soil probings 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 LOCATIOPtiT k The site is located in a flat rural./agricultural area south of f racy, California, approximately one- quarter Ler 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. i 2.2. UST REMOVAL It is our understanding that three underground storage tanks(USTs), dispenser islands and a sociated piping were removed from the-site in Januar; 1995. Aftei removal procedures, soil sampies were collected from beneath each UST. Samples collected from beneath the northern-most tank indicated that nna thorized 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 thi,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).