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SECTION 1 INTRODUCTION This report presents the results of additional Phase I and Phase H environmental site assessments performed by Roy F. Weston, Inc. (WESTON®) at an undeveloped property in the city of Tracy, San Joaquin County, California. The property is located approximately 1,000 feet northwest of the interchange of West Grant Line Road and Interstate 205, and northwest of the intersection of West Grant Line Road and Naglee Road (Figure 1) and consists of approximately 19 acres. It is our understanding that Home Depot, U.S.A., Incorporated (Home Depot) intends to purchase the subject property with the intent of developing it into a retail shopping center surrounding the proposed Home Depot retail site previously assessed. The purpose of the expanded Phase I was to determine if any additional environmental liabilities associated with the subject property currently exist that were not previously identified in the initial Phase I investigation. The purpose of the expanded Phase H assessment was to determine whether recent or past practices at the site and adjacent areas, including possible use of pesticides and/or herbicides, have impacted soil or groundwater. The Phase H assessment was conducted in. general accordance with the scope of work described in WESTON's work plan submitted to San Joaquin County Health Services in August 2000. WESTON performed the expanded Phase I site investigation on 21 July 2000. The investigation consisted of a site reconnaissance for any evidence of potential environmental hazards that currently exist or have existed in the past on the subject site. Regulatory agency database searches, and reviews of historical aerial photographs were conducted by WESTON in March 1999 during the Phase I investigation for the adjacent parcel. Therefore, a complete Phase I investigation is not considered to be necessary for the subject property and a site reconnaissance will be sufficient to characterize any additional potential liabilities associated with these additional portions of the proposed development. Observations made during this site reconnaissance are included in Section 2. The Phase H assessment field work was completed on 22 August 2000, and consisted of the following activities: • Advancement and soil sampling of four direct push borings to a maximum of 16 feet below ground surface(bgs). • Collecting grab samples of the shallow groundwater encountered within the borings. • Collecting composite samples of surficial soils in three areas of the property. G:home\clarkeb\projects\homedepo\tracy\addpI&2.doc I-I October 2000