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y , , for the investigation was approved without revision in December 1992. This report details the field activities and analytical results of that investigation SITE DESCRIPTION Local Description, Surrounding Land Use and Climate ' The Greyhound Terminal is located at 121 South Center Street in Stockton, California, San Joaquin County, near the corner of Center and Washington Streets ter_ (Figure 1). Land use surrounding the terminal mixed commercial and residential The ' terminal is bordered on the north by Market Street, the south by a Chevron service station and Washington Street, the east by Center Street and the Chevron station, and the west by Commercial Street (Figure 2) The surface topography in the area is nearly flat The climate of this area is characterized by wet, mild winters and long, dry hot ' summers. Rainfall occurs intermittently, concentrated between September and March - Average annual precipitation in the Stockton area has been approximately 14.1 inches over the past 30 years (NOAA, 1991). Local Geology and Hydrology The facility is located in the San Joaquin Valley portion of the Great Central ' Valley Geomorphic Province of California The Stockton area is underlain by non- marine, Pleistocene and Holocene sediments of fluvial and lacustnne origins (Norris and Webb, 1990) Sediments at the facility generally consist of reddish-brown to dark grey clayey silt with moderate to well sorted, fine sand lenses The Central Valley is drained by two large river systems. the Sacramento River ' (northern part of the Valley) and the San Joaquin River (most of the southern part of the Valley). The two rivers meet about 13.6 miles northwest of the facility The closest surface water features are the easternmost reach of the Port of Stockton, r v , approximately 1,000 feet north -by northwest of the facility, and Mormon Slough, r located approximately 1,300 feet southwest of the facility (Figure 1). The groundwater conditions in the Stockton area are variable. Historically, ' groundwater typically occurred under water table conditions at a depth between 25 and ' 35 feet (Infuma, 1991) Severe drought conditions'over the last seven years combined with the intense agricultural development have,lowered the water table to below 40 feet Groundwater flow direction in the area is influenced primarily by the Port of Stockton Channel Influence by the smaller Mormon Slough is expected to be seasonal, moving laterally away from the Slough during high precipitation periods Present depth to water at the facility is approximately 43 5 feet. Groundwater flow is Fto the south with a hydraulic gradient'of 0.003 feet per foot Local Surface Water and Groundwater Use The City of Stockton obtains its municipal and industrial water supplies from a combination of treated surface water and numerous groundwater supply wells located in and around Stockton. According to. the State of California, Department of Water EIS1SY356 0510005 ' 2