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r r Page 2 soils were derived mainly from granitic rocks and consist of silty sands which are underlain, at a depth of-approximately, 1 meter by a hardpan layer. Seismic activity in the vicinity of this project is considered to be slight as no known active fault zones traverse the central portion of the San Joaquin Vallev. As to seismically active zones which could affect this project, the site lies approximately 35 km west of the Foothill Fault Zone and approximately 55 km east of the Greenville Fault Zone. A peak acceleration of 0.15 g could be expected in the vicinity of this project according to California Department of Conservation, Division of Mines and Geology, Map Sheet 45 "Peak Acceleration from Maximum Credible Earthquakes in California" dated May, 1987. A bedrock acceleration of 0.15 g could produce moderate shaking, but would be unlikely to cause any hazard from ground rupture or liquefaction. The terrain in the vicinity of this projects is of low relief with a slight westward gradient. The likelihood of deformation from landslide or subsidence are considered negligible. There are.no well defined natural drainage courses within the limits of this project, although irrigation facilities may be encountered. Precipitation is on the order of 32 cm per year and except for isolated perched water tables, groundwater is expected to be found below 18 meters in depth. 3.0 Parcel List, Project Boundaries, and Base Map The parcel list (Table 1) consists of 21 parcels located in the project area. The list includes the APN, the area and the land use, for all project alternatives. Table 2 lists the parcel numbers, the APN number, the name and address of the site/site owner and land use information. 4.0 Records Review 4.1 Aerial Photographs 4.1.1 Sources and Interpretive Methods Aerial photographs were reviewed to assess historic land use and to evaluate whether such use may have contributed to the presence of hazardous substances on land within, and adjacent to the project area. Noted observations regarding land use included, but were not limited to, general site use, the presence of structures or improvements, site access, depressions or drainages, above ground storage tanks, pits or ponds, and other relevant items. The photograph collection of the Caltrans Right of NVay Office in Stockton, California was searched. The earliest set of photographs, 1956, which covered the project area, was chosen for review. The photographs were black and white with a contact prints scale of 1:4800 and was very hard to read.