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3.2 Historical Land Use A Phase I Environmental Assessment performed by CRC in December 1994 indicated that in 1945 a laundry facility existed southwest of the subject property while the subject property was still a vacant lot. The adjacent facility operated until 1972. In 1947, a dry cleaning facility existed on the subject property until 1973. During records review, CRC observed a letter dated March 1971 that indicated two (2) unpermitted USTs were located at the rear (south) of the subject property, and a permit dated March 1973 to install solvent cleaning tanks on the subject property. While there were no records at the Tracy Building Department and the Fire Department regarding any tanks removed from the subject property, CRC noted a building permit dated June 1980 for the demolition of a portion of the building to remove a tank. Building permits issued in the late 1970s and early 1980s referred to the remodelling of the existing structure for a restaurant, construction of a vault, demolition of a portion of the building structure and the construction of a canopy. The building permits issued in 1980 to 1982 listed the owner as State Savings and Loan. 3.3 Geology The subject property lies on a generally flat and gently undulant, northerly sloping terrain at an elevation of fifty (50) feet above mean sea level (msl), within the northwest section of the San Joaquin Valley. San Joaquin Valley is the southern portion of a northwest trending, large, elongate trough known as the Great Valley of California. The northern portion of the Great Valley is the Sacramento Valley which is separated from the San Joaquin Valley by a faulted trans-valley Cretaceous high called the Stockton Arch. The structural trough is bordered by the Sierra Nevada to the northeast, by the Coast Ranges to the southwest, and the Stockton Arch and the Bakersfield Arch to the northwest and southeast, respectively. The bordering mountains and structural highs are the sources of the detrital materials which are washed and deposited into the valley through major drainage systems. The general stratigraphy within the vicinity of the property site, in downward sequence, consists of the following lithologic formations. • Recent and young alluvium consisting of unconsolidated fine to coarse sediments of river channel, flood plain and alluvial fan deposits attaining a thickness of about 150 feet. • Corcoran Clay of the Tulare Formation comprising of unconsolidated to semi-consolidated clay deposits of Pleistocene age. • The Consolidated Rock Units which are composed of undifferentiated igneous, metamorphic and sedimentary rocks. These rock units which underlie the surrounding mountain ranges are the sources of the sediments which are deposited in the lowlands. CRC Environmental Risk Management, Inc. Project#2100-217-2 American Savings Bank 150 West 10th Street May 1995 3 Tracy, California