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Site Background Information TRINKLE & BOYS 31244 South Highway 33, Tracy, California Trinkle & Boys is located approximately five miles southeast of the City of Tracy, San Joaquin County, north of Durham Ferry Road and bound by South Highway 33 to the west and Koster Road to the east. The site was formerly operated as an agricultural crop dusting service for at least 50 years until closure in 2001. The crop dusting service formerly stored pesticides, fertilizers and herbicides inside a fenced area along the northwest property boundary. Additionally, the crop dusting service formerly utilized multiple underground storage tanks (USTs) for storage of gasoline and aviation fuel. Three USTs were removed from the site in 1989, and one UST was removed in 1992, all were removed without permits from the San Joaquin County Environmental Health Department (EHD). Several on-site buildings have been demolished and the property is undeveloped with the exception of a metal hangar building with dirt flooring used for storage, and a small asphalt air plane runway. Currently, a large portion of the site is used for safflower cultivation. 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 Klammath Mountains in the north. The California Coast Range and the Sierra Nevada form the western and eastern boundaries of this province. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. The Modesto, Riverbank, and Turlock Lake Formations and overlying recent alluvium are the principal source 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. UNDERGROUND STORAGE TANK REMOVAL Three 6,000-gallon USTs (two aviation fuel USTs and one unleaded fuel UST) were removed from the site in June 1989, without EHD permits. Advanced GeoEnvironmental, Advanced GeoEnvironmental,Inc.