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5.0 PHYSICAL SETTING <br /> 5.1 REGIONAL AND LOCAL SURFACE WATER <br /> The nearest major surface water body to the subject property is the California Aqueduct, located <br /> approximately 0.25 mile southwest of the subject property. Surface water runoff from the <br /> subject property discharges to the San Joaquin County sewer system through stormwater <br /> surface inlets located in the parking areas and landscaped areas surrounding the building. <br /> 5.2 REGIONAL PHYSIOGRAPHIC CONDITIONS <br /> Based on a review of the USGS 7.5-minute topographic map, Midway, California quadrangle, <br /> dated 1953 (photorevised 1980), the subject property is situated at an elevation of <br /> approximately 210 feet above mean sea level (MSL). The surface topography in the vicinity of <br /> the subject property slopes to the northeast toward the Delta-Mendota Canal, located <br /> approximately 0.5 mile northeast of the subject property. <br /> 5.3 REGIONAL GEOLOGY <br /> The soils in the vicinity of the subject property consist of Capay clays, which are described as <br /> nearly level to level, moderately well-drained soils formed in alluvium derived from sedimentary <br /> rocks. Soil permeability is described as slow, due primarily to the presence of heavy clay in the <br /> surface layer (approximately 40-inches thick) (U.S. Department of Agriculture [USDA] Soil <br /> Survey). These soils are underlain by Cenozoic Sediments of clay, silt, and sand. <br /> 5.4 REGIONAL GROUNDWATER <br /> Based on information reviewed by SECOR in August 2000 at the San Joaquin County <br /> Environmental Health Division, (SJCEHD) during a Phase I ESA for an adjacent site and based <br /> on SECOR's project experience in the area, groundwater in the vicinity is expected to be <br /> encountered at more than 120 feet below ground surface (bgs). However, perched water was <br /> encountered at the Tri-State Trucking Company property, approximately 0.25 mile west of the <br /> subject property, at approximately 20 to 30 feet bgs in 1989/1990. This aquifer is not expected <br /> to be a consistent, regional source of groundwater. Based on the local topography, <br /> groundwater is expected to flow to the north/northeast. <br /> Final ESA Report-30096.009-Tracy CA.doc 15 SECOR International Incorporated <br /> April 14,2005 <br />