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I - ' SITE BACKGROUND INFORMATION STRONG PROPERTY ' 5157 West Business Loop 205, Tracy, California ' The site is located on the north side of West Business Loop 205 between Bird Road and Banta Road, approximately three miles east of Tracy, San Joaquin County, California (Figure 1). The site is located within the southeast quarter of Section 24, Township 2 South,Range 5 East,Mount Diablo ' Base and Meridian (Vernalis Quadrangle, 7.5-Minute USGS Topographic Series, 1991). ' One structure is located on the property and is presently unoccupied. It is our understanding that the site historically operated as a truck depot. ' REGIONAL GEOLOGIC SETTING ' According to Geologic Map of California (1966, California Department of Conservation Division of Mines and Geology), the site area is within the Great Valley Geomorphic Province (GVGP) of California, a large,elongate,northwest trending structural trough.The GVGP is subdivided into two ' major divisions designated the Sacramento.and San Joaquin Valleys, which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to ' the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. ' Based on General Soil Map (1992, United States Department of Agriculture Soil Conservation Service) obtained from the San Joaquin County Soil Survey, the site area is shown as being within the Capay-Stomar-Zacharias(CSZ)soil association.The CSZ soils are located on interfan basins and ' on alluvial fans and stream terraces in the southwestern part of San Joaquin County. The soils generally consist of moderate to well drained, fine textured soils. The CSZ soils generally formed ' in alluvium derived from sedimentary and mixed rock sources. ' GROUND WATER DEPTH AND GRADIENT - REGIONAL Based on information from the Lines Of Equal Elevation Of Water In Wells - Unconfined Aquifer ' Spring 1993, published by the California Department of Water Resources, the estimated ground water elevation at the site is approximately 50 feet above sea level. Based on an approximate elevation of 35 feet above sea level, the depth to ground water at the site is assumed to be 15 feet ' below surface grade (bsg). The regional ground water flow direction near the site area is generally toward the north, although flow directions may vary locally and seasonably. I ' Advanced GeoEnviromnental,Inc.