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t Site Background Information WINDELER RANCH GLASS DISPOSAL 640 West Mossdale Road, Lathrop, California BACKGROUND The site is located in an agricultural field adjacent to the San Joaquin River, in a commercial/agricultural area of un -incorporated San Joaquin County, near Lathrop, California. Sometime around 1908 the San Joaquin River flooded a portion of the site, and gouged out an irregularly shaped hole up to approximately 15 -feet deep. In 1966 the site began operation as a disposal site. It is our understanding that the flood hole was, at that time, used for the disposal of waste glass or "cullet" and related solid wastes resulting from the manufacturing operations of the Libby Owens Plant. Stockpiled waste materials were hauled to the waste site where they were placed into the hole and then covered with approximately 4 -feet of fill soil. Fill soil was obtained from the bottom of the hole by tractor and scraper or dragline. REGIONAL GEOLOGIC SETTING The site is located within the northern San Joaquin Valley, which comprises part of the Great Valley geomorphic province of California. The San Joaquin Valley is formed by the Great Valley geosyncline, which is a large, elongate, northwest -trending, asymmetrical structural trough (basin). It 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. This trough 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 greater than 20,000 feet, in the south central portion of the valley. The sedimentary formations vary in age from Jurassic to Recent, with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental -derived sediments were typically deposited in lacustrine, fluvial, and alluvial environments, with sources being the mountain ranges surrounding the valley. The site is located on unconsolidated and semi -consolidated alluvium, lake, playa, and terrace deposits of Quaternary age. 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). The San Joaquin River is the nearest surface water feature in the vicinity of the property, located approximately 1,500 feet east of the site. The San Joaquin River is primarily used for commercial and recreational boating, as well as agriculture; its channel continually contains water and has a potential tidal effect upon ground water depth or flow direction in the area. Advanced GeoEnvironmental, Inc.