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' Rajappan&Mever Date: 1/7/99 Arch Road/Highway 99 Page: 1 ' 1.0 BACKGROUND URS Greiner Woodward-Clyde (URSGWC) was retained by Rajappan and Meyer, Inc. (R&M) to conduct a preliminary environmental investigation of the Arch Road/Highway 99 Interchange. The project area consists of land to the north, south, east, and west of the Interchange. A parcel of property on the far southwestern comer of the project area is of particular concern because a ' gas station was located there in the late 1960s. The gas station was subsequently demolished; the status of the underground storage tanks (USTs) at the site is unknown. Refer to Figure I for the project area location. This investigation will entail a geophysical survey to determine if any USTs remain at the former site of the gas station, and a subsurface investigation to determine if contamination due to leaking tanks is present. Additionally, surface soil will be collected throughout the project area to assess the impact of vehicular exhaust and agricultural impact. This document outlines the approach URSGWC will use to perform the environmental investigation. ' This Work Plan is being prepared and submitted to the San Joaquin County Environmental Health Division at their request. ' 2.0 PROPOSED APPROACH AND SAMPLING ' 2.1 Objectives The objectives of this investigation are to assess: The presence, or absence, of USTs at the site of the former gas station. ' • The presence, or absence, of subsurface soil contamination due to leaking USTs at the former gas station site; ' • The presence, or absence, of lead-contaminated surficial soil due to emissions from vehicle exhaust; and ' If shallow groundwater is present, a sample will be collected to determine the presence, or absence, of groundwater contamination due to leaking USTs. ' R&M/Arch Rd/43-00066762.00.1000