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ISite Background Information SIERRA LUMBER MANUFACTURERS (Case #2) 375 West Hazelton Avenue, Stockton, California BACKGROUND The site area is located approximately 500 feet north of West Scotts Avenue between South Van IBuren Street and South Monroe Street in a topographically flat area of Stockton, California (Figure 1) The site is occupied by Sierra Lumber Manufacturers, a wood-products processing and manufacturing facility Prominent features of the site are illustrated on Figure 2 REGIONAL GEOLOGICIHYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough, the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east The Great Valley has been filled with sediments derived from both marine and continental sources • Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits, continental Continental-denved sediments were typically deposited in lacustrine, fluvial, and alluvial environments with sediment sources being the mountain ranges surrounding the valley (Olmsted and Davis, 1961), the site itself is located on unconsolidated and semi-consolidated ' alluvium, lake, playa, and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined, but are believed to be metamorphic and igneous in origin The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the � principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United IStates Department of Agriculture Sol] Conservation Service in 1992, the site area is withing the Jackson-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and generally consist of moderately- 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 of mixed rock sources Based on review of the map entitled Lines ofEgual Depth to Groundwater Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD), r Advanced GeaEnvironmental,Inc I