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San Joaquin County Page 2 Phase II Assessment Work Plan Public Health Services Tracy, California Environmental Health Division 30 April 1999 Background Our understanding of the project has been developed based on review of information developed during our Phase I Environmental Assessment (WESTON, March, 1999). The subject property covers approximately 12.89 acres, and is bounded by cultivated farmland on the north, west, and east, and by a rural residence on the south. The proposed Home Depot site is part of a larger proposed commercial development that extends to the north, east, and south from the proposed Home Depot property. The property is located within the city of Tracy, San Joaquin County, California. Figure 1 depicts the approximate location of the subject property on a USGS topographic base map. Figure 2 shows the approximate location of the subject property on an Assessors Parcel plat map. The subject property is vacant of any building structures, and consists 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 sewer easement crossing the southeastern part of the property. A small amount of debris is present 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 drums are stored at the rear of the adjacent residential property, along the western, south edge of the subject property. The City of Tracy Planning Department was consulted during development of WESTON's Phase I assessment. The Planning office requires assessment of potential impacts to soil and groundwater from excessive concentrations of pesticides and non-specific petroleum hydrocarbons, due to agricultural land use and historic presence of petroleum pipelines in the vicinity of the property. Depth to groundwater in the vicinity of the subject property is estimated to be approximately 10 feet below ground surface (bgs). Proposed Investigation In order to characterize possible impacts related to the agricultural land use of the subject property, and historic presence of petroleum pipelines in the vicinity, WESTON proposes advancing six borings at the subject property, and collecting undisturbed soil samples and groundwater grab samples. Selected samples will be analyzed for pesticides and petroleum hydrocarbons, the potential contaminants of concern. SCA: s:\whc\wp\sharedl\projects\homedepo\tracy\p2wkplan.doc