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EXECUTIVE SUMMARY In July and August 2000, Roy F. Weston, Inc. (WESTON®) performed additional Phase I and Phase U environmental assessments at a property under consideration for development by Home Depot in the city of Tracy, San Joaquin County, California. The objectives of the additional Phase I were to investigate any potential environmental conditions on the expanded portion of the proposed development. The objectives of the additional Phase H were to evaluate potential pesticide and herbicide impact to soils 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 covers approximately 19 acres and is located northwest of the intersection of West Grant Line Road and Naglee Road, approximately 1000 feet northwest of the West Grant Line Road and the Interstate 205 interchange. WESTON conducted previous investigations on the western portion of the parcel, where Home Depot plans to construct a retail store. Home Depot is now considering the purchase of the remaining part of the parcel. The location and layout of the expanded study area parcel is indicated on Figure 1 and Figure 2. The subject property abuts the site of the proposed Home Depot retail site (previously investigated) on the north, east, and south, and is being considered for further commercial development. In March 1999, WESTON completed a Phase I environmental assessment on the adjacent lot where a Home Depot retail store is planned. 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 that an assessment of possible elevated pesticides/herbicides and petroleum hydrocarbons be conducted prior to development of the property. The attendant Phase H investigation conducted by WESTON in May 1999 indicated that no petroleum hydrocarbons or volatile organic compounds (VOCs) were detected in site soil or groundwater. Trace concentrations of the herbicide Dalapon (2,2-dichloropropionic acid) were detected in one composite surface soil sample. However, no significant concentrations of pesticides or herbicides were detected in soil or groundwater. WESTON conducted an additional Phase I investigation on the subject property on 21 July, 2000. This investigation consisted of a site reconnaissance to identify any additional environmental liabilities associated with the subject property that were not previously identified in the initial Phase I investigation. No significant environmental liabilities were observed on or adjacent to the subject property during the site reconnaissance. However, a Chevron pipeline is present beneath the north side of Grant Line Road. This pipeline carries gasoline and diesel fuel and could potentially present a threat to groundwater if leaks have occurred. At the time of the field investigation on 22 August 2000, 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 on the eastern boundary of the property, within a Pacific Gas and Electric (PG&E) Company easement that crosses the eastern and southern portions of the property. Additionally, a sewer manhole is present in the eastern part of the property, associated with a City of Tracy sewer easement crossing the southern and eastern portions of the property. A shallow ditch is present along the north side of Grant Line Road. Various debris G:home\clarkeb\projects\homedepo\tracy\addp I&2.doc ES-1 October 2000