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f.. The types of structures in the vicinity of the subject property are shown in Figure 2, Site Vicinity Map (Appendix 1). Immediately to the north of the subject property is a two-story building occupied by the Stockton Police Department. To the east is the subject property's parking lot and the Police Department parking lot. To the south, across Channel Street is Tags Outlet Glass store, which was 't formerly a Goodyear Tire store. To the west, across El Dorado Street, is a State of California office building. 3.2 Geology and Hydrology The subject property lies in the northern part of the San Joaquin Valley Basin, a structural basin within the northern part of the Great Valley Geomorphic Province of California. Unconsolidated alluvial sediments of Quaternary age which underlie San Joaquin Valley consist of clays, silty clays and sands. Soils encountered in the borings consist of fine-grained sediments such as clay, silt, silty sand and clayey sand. Vertical and horizontal changes in the soil types were observed between the soil borings, as indicated in the boring logs (Appendix VI). The soil within the saturated zone consists of fine grained silty sands with a few scattered small gravels. Groundwater in the Stockton vicinity is reported to be shallow, typically encountered at 33 to 35 feet bgs. CRC encountered groundwater during drilling at approximately 30 to 36 feet bgs. The piezornetric groundwater surface (static water level) was measured at 27 to 28 feet bgs in monitoring wells MW1, MW2 and MW3. The groundwater flow direction at the subject property was ' determined to be to the southeast. 3.3 Site History The history of the land use of the subject property was reviewed by CRC using Sanborn Maps, historical aerial photographs, city directory listings and Clayton ' Environmental's Phase I Environmental Assessment report dated February 7, 1991. The review of the history of land use indicated that the property has been ' used by auto-related businesses from at least 1939 to 1954. A bank building was constructed in 1961 by State Savings and Loan Association, which occupied it until 1982. American Savings & Loan occupied the building from 1984 to 1988. The subject property is currently used as a school. 4.0 SUMMARY OF PHASE II FIELD OPERATIONS 4.1 Geophysical Survey On October 3, 1995, a geophysical survey was conducted by Norcal, utilizing EM utility locating and GPR methods. This survey was performed in order to provide „ CRC Environmentai Risk Management,Inc. Project#21oo-250-2 American Savings Bank 222 North El Dorado Street November 3, 1995 Stockton,California 4