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2. SITE DESCRIPTION 2.1 Site Location The Tracy site is situated along the Southern Pacific Railroad tracks, near the intersection of Franklin and Acacia Streets in Tracy, California. The site is located within the southwest quarter of the northwest quarter of ' Section 22, Township 2 South, Range 5 East. Figure 1 shows the site location. Currently, the Tracy site is wholly owned by PG&E and used as a service ' center and substation. There is one office building on the site. Approximately 28 employees and 20 vehicles are typically onsite. The site is completely fenced. Approximately 95% of the site is paved with asphalt or concrete. The Tracy site is surrounded by agricultural land to the east; a railroad, pet food plant, and form manufacturing company to the west; manufacturing facilities to the south; and residential properties to the north. 2.2 Site Geology The Tracy site is located within the northwestern part of the San Joaquin Valley between the San Joaquin River to the east, the Coast Range to the 1 west, and the Old River (a channel of the San Joaquin River) to the north. The San Joaquin Valley is the southern portion of the Great Valley geomorphic province, which is a topographic and structural basin bounded on the east by the Sierra Nevada fault block and on the west by the Coast Ranges. The basin is filled with a thick sequence of sedimentary rocks, ranging in age from Jurasic to Recent, which were deposited on a crystalline basement. The Tracy site is situated on a veneer of young flood plain deposits that overlie older Recent deposits. This veneer consists mainly of clays and silts. The Recent deposits consist of unconsolidated clays, silts, sands and gravels to a depth of over 100 feet. This sequence overlies the Corcoran Clay Member of the Pleistocene -age Tulare Formation. The Corcoran 1 3542a/BAV102 3