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MM _ M, i *N.w r,, �-. ,r{ �`^�r '� y W.. �.,,.,�,z* ,; ";� u?•- � °'1 ��- a ° � 9i.�' .� rH..:a 'a w,•. "�;'�S. �°� •.�, �'.' nLL E, SITE DESCRIPTION Local Description,Surrounding Land Use and Climate The Greyhound Terminal is located at 12: South Center Street in San Joaauin County,Stockton, near the corner of Center and Washington Streets (Figures 1 and 2). Land use surrounding the terminal is typical of a metropolitan area consisting of a mixed commercial/residential character. 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 Commerce Street (Figure 2). The surface topography in the area can be characterized as flat. This area is typically characterized by a climate of wet mild winters and dry, hot summers however, the region is entering into the sixth year of drought and currently retains a much dryer climate. Rainfall occurs intermittently,concentrated between September and March. Average annual precipitation recorded over a thirty year period for the Stockton area is 14.1 inches. 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, including the Greyhound facility, is underlain by non-marine, Pleistocene and Holocene deposits of fluvial and lacustrine origins (Norris and Webb, 1990). Deposits at the facility generally consist of reddish-brown to dark grey clayey silt with moderate to well sorted, fine sand lenses (Figure 3). Reported hydraulic conductivity values associated with these materials range from 10'7 to 10-Z cm/sec (Freeze and Cherry, 1979;Domenico and Schwartz, 1990). The Central Valley is drained by two large river systems: the Sacramento River (northern part of the Valloy) 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, approximately 1,000 feet north by northwest of the facility and the Mormon Slough, positioned approximately 1,300 feet southwest of the facility(Figure 1). Prior to agricultural development,water in the San Joaquin River was sustained by runoff from precipitation. Water in the river is presently sustained by a combination of runoff and agricultural wastewater derived from drained fields that use irrigation water brought in from outside the San Joaquin River drainage area. The groundwater conditions in the Stockton area are transient. Historically, groundwater typically occurred under water table conditions at a depth between 25 ant- 35 feet below land surface (Infurna, 1991), however, drought conditions over -. the last five years combined with intense agricultural development have lowered the water table below the historical range. t Presently,depth to water at the facility is approximately 43.5 feet. Groundwater flow is to the south with a hydraulic gradient of 0.002 ft/ft(Figure 4). LML/SY132.21J0083 REV 0 7