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Buck&Mendoza Property July 20,2005 Phase I Environmental Assessment Page:6 3.1 Site Location Maps have been provided in order to give a picture of the location of the subject property. Maps included are a vicinity map (Figure 1), a parcel map and site maps (Appendix A), and a record search index map (Appendix E). 3.2 Description of the Area The subject property is located in a rural area northwest of Tracy known as Mountain near Altamont Pass and the San Joaquin and Alameda County Lines. It is surrounded by pasture and farm lane along with some residences or small ranches. A natural gas and oil pipeline run diagonally across the Mendoza parcel. 3.3 Geology & Hydrology i The Central San Joaquin Valley is floored by unconsolidated quaternary sediments to depths of 400 feet or more. All of these units can be considered soils in the engineering sense, as they are unconsolidated. The sediments of the Central Valley were deposited as a series of coalescing alluvial fans. The fans originated where valleys of-major streams that drained the Sierras, emptied into the broad expanses of the Central Valley. The coarser sediments, which comprise the fans, are mainly arkosic in composition. They were derived from erosion associated with glacial stages in the mountains. The finer grained sediments are predominantly composed of rock flour washed out of the former extensive glaciers in the Sierras (Arkley, 1964). E There are layers of clay and layers of hardpan throughout the Mountain House area. These layers are not considered discontinuous, and communication between "perched" water, shallow aquifers and deeper aquifers are believed to occur in the Central Valley. Groundwater, in this area, ranges from 10 to 60 feet from the surface with the gradient in the north/northeast direction. 3.4 Asbestos and Lead Based Paints An inspection was made of the properties for asbestos and lead based paint related health hazards. Building materials that contain asbestos in a friable condition can pose a health hazard. Friable asbestos sources were not observed and analytical samples were not taken. However, if the structures were to be demolished, potential asbestos containing building materials such as the flooring tiles and roofing material used in construction of the house would have to be tested for asbestos, and possibly removed by a licensed asbestos removal contractor. Some sheet rock wall materials naturally contain asbestos and would also have to be considered during a demolition. I