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industrial or similar areas. Materials that contain over one percent asbestos fib rs are considered ACMs and must be handled according to Occupational Safety and Health Administration (OSHA)and EPA regulations if disturbed. During the site visit conducted on April 5, 2001, the following materials, which could potentially contain asbestos, were surveyed. The materials observed at the site included; wallboard, joint tape and taping compound, acoustical drop ceiling anels, flooring materials, covebase material, and their associated mastics. No structu al fire proofing was observed during the survey. The above-mentioned materials were observed to be in a generally undamaged condition at the time of this survey. Because the on-site building was constructed after 1983, it is possible, but unlikely the identified suspect ACMs contain asbestos. 5.2.3 Site Vicinity Reconnaissance - A site vicinity reconnaissance was conducted by Mr. Van Allen on April 5, 2001. The site vicinity was observed to consist of commercial and industrial properties. More specifically, the following surrounding properties were observed on the day of the site visit (Figure 2): North: Western Flat Rolled Steel & Process with industrial properties ',further north; East: Shaw Road with undeveloped land further east; South: BAR A with industrial properties further south; and West: Highway 99 with industrial properties further west. 5.3 Hydrogeologic Setting Stockton, California is located in the Stockton Valley, the southern extensior of the California Great Central Valley (Figure 1). The Great Central Valley is a deep alluvial plain extending nearly 500 miles from the Siskiyou Range of the Cascade Mountains in the north to the Tehachapi Range to the south. At Stockton, the Stockton Valley is approximately 60 miles wide. The western Valley boundary consists of the low, rolling foothills of the California Coast Range Mountains (maximum elevation due west is less than 3,000 feet) and the eastern boundary consists of the more rugged foothiII3 of the Sierra Nevada (maximum elevation due east is over 10,000 feet). The Great Central Valley contains a thick sequence of sediment that, in places, rE aches a depth of 10 miles. These sediments range in geologic age from Jurassic (205 million years before present) to Recent (present time) and include both marine and co tinental deposits. The site's immediate subsurface geology consists of Pleistocene and Recent alluvial deposits. These alluvial deposits consist of heterogeneous sequences of sand and gravel originating from active stream channels, and silt and clay originatir g from overbank and marsh depositional environments. Regional groundwater depth is reported to be approximately 65 feet below g ade and the inferred groundwater gradient is southwest (Department of Water Resources, 1999). 54.25601.0005 6 ATC Associates Inc.