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' Rajappan&Meyer Date:3/3/99 <br /> .Arch Road/Highway 99 Page: 1 <br /> 1.0 BACKGROUND <br /> URS Greiner Woodward-Clyde (URSGWC) was retained by Rajappan and Meyer, Inc. (R&M) <br /> ' to conduct a soil investigation of the Arch Road/Highway 99 interchange. The project was <br /> conducted in accordance with the Soil Sampling Work Plan Arch Road/Highway 99, Stockton, <br /> California (URSGWC 1999). The project area consists of land to the north, south, east, and west <br /> of the interchange. A parcel of property on the far southwestern comer of the project area is of <br /> particular concern because a gas station was located there in the late 1960s. The gas station was <br /> subsequently demolished; the status of the underground storage tanks (USTs) at the site was <br /> ' unknown. This investigation entailed a geophysical survey to determine if any USTs remained at <br /> the former site of the gas station, and a subsurface investigation to determine if contamination <br /> due to leaking tanks is present. Additionally, surface soil samples were collected throughout the <br /> project area to assess the impact of vehicular exhaust. Refer to Figure 1 for the project area <br /> location. <br /> 2.0 PROPOSED APPROACH AND SAMPLING <br /> 2.1 Objectives <br /> The objectives of this investigation were to assess: <br /> The presence, or absence, of USTs at the site of the former gas station. <br /> • The presence, or absence, of subsurface soil contamination due to leaking USTs at the former <br /> gas station site; <br /> • The presence, or absence, of lead-contaminated surficial soil due to emissions from vehicle <br /> exhaust. <br /> 1 R&M/Arch Rd/43-00066762.00.5000 <br />