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Stockton 99 Speedway Preliminary Endangerment Assessment Workplan April 12,2007 2.4 Climate The climate at the Site is characterized by warm-dry summers and cool-wet winters. The warm-dry season generally extends from May through October and the cool-wet season from November through April. Mean annual precipitation ranges from approximately 11 to 12 inches per year. 2.5 Site Operations The Site is located in an area of mixed residential and commercial use. According to information contained in the Phase I Environmental Site Assessment (Phase I ESA, Kleinfelder 2005a) completed by Kleinfelder, the Stockton 99 Speedway was built in 1947. Prior to that time, the land was believed to be in agricultural use. The Site currently contains a %-mile paved racetrack, bleachers, storage sheds, concession stands, restrooms, and mobile home and dirt parking areas (Figure 2). Improvements include two domestic water supply wells, power lines, access roads, approximately five dry wells, pad- and pole-mounted transformers, utility vaults, and subsurface drains (Kleinfelder 2005a). Soil previously excavated from an area located northwest of the racetrack was reportedly used for fill under bleachers located adjacent to the racetrack. The excavation, or borrow area was reportedly backfilled with debris including concrete, asphalt, and gardening material. Information provided by Site personnel to SGl during this investigation indicates that the fill was imported in the early to mid 1960's from a railroad overpass reconstruction project located in the downtown area of Stockton (SGI 2007). 2.6 Existing Site Data Various geotechnical and environmental investigations have been conducted at the Site. Data from these investigations have been used to develop the conceptual site model and will be supplemented with additional data gathered during the PEA. A description of the previous investigations is presented below. Historical soil data is included in Appendix A. Previous sample locations are presented on Figure 3. As noted above, in September 2005, Kleinfelder conducted a Phase I Environmental Site Assessment for Legacy Development for the Stockton 99 Speedway racetrack. During the site reconnaissance a number of potential environmental concerns were noted which included: • A fuel AST with secondary containment and approximately ten 55-gallon drums, both located north of the racetrack; • Stained soil on the southern end of the racetrack infield; and • A number of structures located onsite that were built prior to 1980 that could contain lead based paint and/or asbestos containing materials. PEAwW44an.Final.&x 2-2 The Source Group,Inc.