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San Joaquin County Page 2 Phase II Assessment Work Plan Public Health Services Tracy, California Environmental Health Division 7 August 2000 Background Our understanding of the project is based on review of information compiled during our Phase I and Phase II Environmental Assessments previously conducted in the western part of the parcel (WESTON, March 1999, May 1999). The property that is the subject of the current investigation covers approximately 18.8 acres, and borders the north, east, and south sides of the originally proposed development, occupying the remaining majority of Assessors Parcel 212-04-24. The subject property is bounded by cultivated farmland on the north, west, and east, by Naglee Road on the southeast, and by Grant Line Road on the south. The property is located within the city of Tracy, in 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. A high-pressure fuel line operated by Chevron Oil Company runs east to west along the north side of West Grant Line Road. At the request of the City of Tracy Planning Department, WESTON conducted a previous Phase II investigation in May 1999 on the western part of the parcel containing the subject property (Figure 2). Home Depot is now considering the purchase of the property comprising the remainder of the parcel. 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. During the previous Phase II investigation, groundwater was encountered at a depth of approximately 14 feet below ground surface (bgs). Soils encountered during that investigation consisted of yellow-brown silt and clay. Results of the previous Phase H investigation indicated that significant impacts had not occurred to soil or groundwater underlying the study area. Proposed Investigation In order to characterize possible impacts related to the agricultural land use of the subject property, and the historic presence of petroleum pipelines in the vicinity, WESTON proposes advancing four soil borings at the subject property. Undisturbed soil samples and groundwater grab samples will be collected for analysis of pesticides and herbicides and/or petroleum SCA: s:\whc\wp\sharedl\projects\homedepo\tracy\p2wkplan.doc