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In addition to the clarifier, AGE noted a hand-washing sink and toilet near the northeast corner inside of the motor and pump repair facility during the December 2003 site inspection; no other wash sinks were present in the northern portion of the site. REGIONAL GEOLOGIC SETTING According to the Geologic Map of California, published in 1977 by the State of California Department of Mines and Geology, the site area is within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending structural trough. The Great Valley Province has been filled to its 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 Mountains, respectively. The Great Valley Province is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys. Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Jacktone-Hollenbeck-Stockton (JHS) association. The JHS soils are located within basins, and generally consist of moderate to poorly drained fine textured soils. The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed rock sources. Based on information from the United States Department of Agriculture's Soil Conservation Service STATSGO (State Soil Geographic Database) soil maps. The soil surface texture is listed as TOKAY soil, a fine sandy loam in a Class B Hydrogeologic Group which includes moderate infiltration rates; soils are deep and moderately deep, moderately well and well-drained with moderately coarse textures. The depth to bedrock is estimated at greater than 60 inches. The three defmed soil layers, ranging from 0 to 60 inches, are classified as fine sandy loam with a water permeability rate range of 2 to 6 inches per hour. The site is located in a 500-year Flood Zone. This data, available in select counties across the country, was obtained by Environmental Data Resources Inc. (EDR) in 1999 from the Federal Emergency Management Agency (FEMA); the data depicts 100-year and 500-year flood zones as defined by FEMA. GROUND WATER DEPTH AND GRADIENT The estimated depth to ground water at the site is approximately 50 feet below surface grade (bsg), based on the map titled Lines of Equal Depth to Groundwater, Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD) It is inferred from the map titled Lines of Equal Elevation of Groundwater, Spring 1999, also published by the FCD&WCD, that the local ground water flow is toward the south on the site, but this maybe greatly Advanced GeoEnvironmental, Inc.