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L-7 L:1 Soil Excavation Work Plan Addendum WINDELER RANCH GLASS DISPOSAL 640 West Mossdale Road, Lathrop, California 1.0. INTRODUCTION At the request of the Brown Sand, Inc., Advanced GeoEnvironmental, Inca (AGE) has prepared this Soil Excavation Work Plan Addendum for the property located at 640 West Mossdale Road, Lathrop, California (the site). The location of the site is illustrated on the Location Map provided in Appendix A. The scope of work includes soil excavation of a series of trenches and/or potholes to determine the extent of the former glass disposal site. Sampling will also be performed to determine if any contaminated soil is present. The Work Plan Addendum is prepared in response to the San Joaquin County Environmental Health Department letter dated 11 September 2007 (Appendix B), requesting additional information in regards to the Recommendation for Locating Existing Glass Disposal Site dated 14 August 2007, prepared by Wong Engineers, Inc. Excerpts form the Recommendation for Locating Existing Glass Disposal Site is included as Appendix A. 2.0. 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. 2.1. 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 Advanced GeoEnvironmental, Inc.