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SECTION 2 BACKGROUND AND SITE DESCRIPTION The subject property is being considered for development as a Home Depot retail store, as part of a larger planned commercial development to the north, east, and south. The property is located on a nearly level plain that borders low foothills to the south, and is situated in the western part of the city of Tracy, in San Joaquin County, California. The vicinity of the property is characterized by agricultural land with some commercial development to the east and south. The overall property consists of a nearly square-shaped parcel occupying approximately 12.89 acres, set back approximately 450 feet to the north of West Grant Line Road near its intersection with Naglee Road. The subject property is bounded immediately on the west, north and east by agricultural land, and on the south by a rural residence and vacant land. At the time of the field investigation, 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 drums 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 City of Tracy Planning Department was consulted during development of WESTON's Phase I environmental assessment (WESTON, March 1999). The Planning Department is requiring assessment of potential impacts to soil and groundwater from pesticides and non-specific petroleum hydrocarbons prior to development of the property, due to agricultural land use and historic presence of petroleum pipelines in the vicinity of the property. The San Joaquin County Environmental Health Division, permitting agency for the subsurface exploration described herein, also requires a copy of this assessment report for their files. Information found during development of the Phase I assessment indicated that the estimated depth to groundwater in the vicinity of the subject property is approximately 10 feet below ground surface (bgs),with possible perched water occurring as shallow as approximately four feet bgs. Soils in the area of the subject property are classified as Capay clay (U.S. Department of Agriculture, Soil Conservation Service, 1992). These soils form on alluvium deposited in interfan basins, and typically consist of surficial clay and silty clay overlying occasionally calcareous clay and may be developed to a depth of 60 inches or more. These soils are slowly permeable. The San Jose sheet of the Geologic Map of California (California Division of Mines and Geology, 1988) S:\whc\wp\sharedI\projects\homedepo\tracyph2.doc 2-1 July 1999