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r L law MACHADO PROPERTY Page 8 WKA No. 6078.02 ` November 1, 2004 subject property,therefore, is predicted to have ranged from approximately 10 to 30 feet below the ground surface. The 1978 7.5 minute Clifton Court Forehay Topographic Quadrangle Map prepared by the U.S. Geological Survey, indicates that regional topography in the region of the L subject property slopes northeasterly, therefore we estimate groundwater flow direction as northeasterly. t L Regional Geology LThe 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 L, Great Valley are typified by thick sequences of alluvial (river) sediments deposited during the filling of a large ancient basin. L 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 L consist of two soil types. The soil types are "Capay clay, 0 to 2 percent slopes" and"Stomar clay loam, 0 to 2 percent slopes." L The Capay clay formed in alluvium derived from mixed rock sources. The surface layer is typically grayish brown and dark grayish brown clay approximately 20-inches thick. The subsoil, 1 approximately 60-inches thick, consists of grayish brown, dark grayish brown, dark brown and pale brown clay. L The Stomar clay loam formed in alluvium derived from sedimentary rock sources. This soil is L typically grayish brown clay approximately 19-inches thick. The subsoil, approximately 30- inches thick, is a mixture of brown clay loam and clay that is underlain by yellowish brown clay loam at a depth of 60-inches. WALLACE•KUHL &ASSOCIATES ING