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EXECUTIVE SUMMARY In December 1998, Roy F. Weston, Inc. (WESTON®) performed a Phase II environmental assessment at a property under consideration for a potential Home Depot store site in the city of Tracy, San Joaquin County, California. The objectives of the Phase II were to evaluate potential pesticide and herbicide impact to soils and groundwater associated with past agricultural activity, and evaluate possible petroleum hydrocarbon impacts to soils and groundwater associated with pipelines operated in the vicinity. The subject property is nearly square and covers approximately 12.8 acres, and adjoins the northwest side of the intersection of West Grant Line Road and Naglee Road. The property is located northwest of the West Grant Line Road and Interstate 205 interchange. The Home Depot site is part of a larger commercial development that extends north, east, and south from the proposed Home Depot property. In March 1999, WESTON completed a Phase I environmental assessment on the subject property. The Phase I assessment concluded that the property had a low potential for contamination based on historical land use. However, the City of Tracy Planning Department required assessment of possible elevated pesticides/herbicides and petroleum hydrocarbons attendant to development of the property. At the time of the field investigation on 12 May 1999, the subject property was vacant of any building structures, and consisted primarily of fallow agricultural land formerly planted in hay or alfalfa. Two electrical transmission towers are located in the southern part of the property, within a Pacific Gas and Electric (PG&E) Company easement that crosses the southeastern corner of the property. Additionally, a sewer manhole is present in the central southern part of the property, immediately north of the power line towers, associated with a City of Tracy sewer easement crossing the southeastern part of the property. A small amount of debris is present on the ground surface in the area between the two power line towers. A shallow ditch drains towards the west from the vicinity of the towers. Some empty plastic drtuns are stored along a barbed wire fence at the rear of the adjacent residential yard, which lies within the western, south edge of the subject property. The Phase II sampling program consisted of advancing three direct push borings to a maximum depth of 16 feet below ground surface (bgs), sampling of soil and groundwater encountered within the borings, and collecting composite samples of surficial soils in three areas of the property. The samples were analyzed for the following constituents: • Three soil samples from the borings were analyzed for total recoverable petroleum hydrocarbons (TRPH). SAwhc\wp\shared]\projects\homedepo\tracyph2.doc ES-1 July 1999