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�. *ftool 0-0 Site Background Information SARALE FARMS 16500 West Clifton Court Road, Tracy, California LN The site is located in a topographically flat area of Tracy, California (Figure 1), approximately 60 0.5 miles west of the intersection of West Clifton Court Road and Cal Pack Road; it is presently utilized as a storage and repair facility for agricultural equipment and operations. A portion of the 4W site is occupied by several structures utilized for office space,equipment maintenance,and a storage yard. One 10,000-gallon gasoline underground storage tank (UST) was formerly located on the northern portion of the property. Structures and the former tank location are illustrated on Figure 2. 1.. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly flat- lying alluvial plain that extends 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 4,. California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origins. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. 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 Jackson-Hallenbeck-Stockton(JHS)association.JHS soils are located within basins,and generally consist of moderately- to poorly drained, fine-textured soils. The soils are typically derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed rock sources. ~' 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). This basin is drained primarily by the San Joaquin River. The nearest surface water feature in the vicinity of the property is the Old River, approximately 2.5 miles west of the property. r� UNDERGROUND STORAGE TANK REMOVAL y On 07 December 1992, one 10,000-gallon gasoline UST and approximately 100 feet of associated piping were removed from the site by Western Meter Service, Inc. and transported to Cal Coast Manufacturing Co. for disposal. An Unauthorized Release Report (UAR) was issued by the San Joaquin County Environmental Health Department(EHD) on 31 December 1992. w. Advanced GeoEnvironmental,Inc. V