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`/ TEIXEIRA-SOUZA PROPERTY Page 11 WKA No. 5475.03 L June 2, 2003 L subject property slopes northeasterly, therefore we estimate ground water flow direction as ,I northeasterly. Regional Geology The subject property is located in the central portion of the Great Valley geomorphic province of California. The Great Valley lies between the mountains and foothills of the Sierra Nevada Range to the east and the California Coast Ranges to the west. The geologic formations of the Great Valley are typified by thick sequences of alluvial (river) sediments deposited during the filling of a large ancient basin. The 1985 USGS Geologic Map of the Late Cenozoic Deposits of the Sacramento Valley and Northern Sierra Foothills, California, shows the subject property to be underlain by the Lower member of the Modesto Formation. The Lower member geologic unit is characterized by unconsolidated, slightly weathered gravel, sand, silt and clay. Soils Review of the 1998 U.S. Department of Agriculture, Soil Conservation Service(SCS) Soil Survey of San Joaquin County, California, indicates that the near-surface soils of the project area ` consist of four soil types. The predominant soils consist of"Stomar clay loam, 0 to 2 percent slopes." The other soil types are"Vernalis clay loam, 0 to 2 percent slopes", "Capay clay, 0 to 2 �. percent slopes" and"Stomar clay loam, wet, 0 to 2 percent slopes" ` The Stomar clay loam formed in alluvium derived from sedimentary rock sources. This soil is typically grayish brown clay approximately 19-inches thick. The subsoil, approximately 30- Linches thick, is a mixture of brown clay loam and clay that is underlain by yellowish brown clay loam at a depth of 60-inches. 6. The Vernalis clay loam formed in alluvium derived from mixed rock sources. The upper layer of the surface layer is typically brown clay loam approximately 9-inches thick. The lower portion of the surface layer is grayish brown and brown clay loam and pale brown loam approximately 38-inches thick. The subsoil, approximately 60-inches thick, is pale brown fine sandy loam. I INK L WALLACE-KUHL 6 ASSOCIATES INC.