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Phase I Environmental Site Assessment Neighborhood E Page IO i structure is no longer present. The private road now also extends past the Site boundary. An additional structure, west of the creek and north of the private road appears in the 1968 map. There are no changes to the Site in the 1978 map. 4.5 HISTORICAL USE INFORMATION ON ADJOINING PROPERTIES City directories and Sanborn Fire Insurance Maps are not available for the adjoining properties. Historical use information on the adjoining properties was researched using aerial photographs and historical USGS topographic maps received from EDRO. Aerial photographs from 1957, 1982, and 1994 were reviewed. The adjoining properties appear to have been used for agriculture in the 1957 photo. Roads are present along the field boundaries. There is a canal to the north of the Site, which intersects the creek immediately north of the Site. A farm complex is located northwest of the Site. A large farm complex is present northeast of the Site, approximately 600 feet from Byron Road. A small farm complex is located southeast of the Site. There are no changes in the 1982 and 1994 photos. Historical topographic maps from 1916, 1952, 1968, and 1978 were reviewed. The adjoining properties appear to be agricultural land in the 1916 map. Canals pass to the northeast and southwest of the Site in the 1952 map. A couple of structures are noted north of the Site along the creek. A structure is apparent east of the Site, south of the private road. A dry pond is apparent in the 1968 map to the northeast of the Site. There are no further changes in the 1968 map. The dry pond from the 1968 map is shown as an intermittent pond in the 1978 map. There are no further changes to the adjoining properties in the 1978 map. 5.0 SITE RECONNAISSANCE 5.1 METHODOLOGY AND LIMITING CONDITIONS A driving reconnaissance of the surrounding area and a walking and driving reconnaissance of the Site were performed August 17, 2001, in accordance with the ASTM practice. A limiting condition to the Site reconnaissance existed due to the agricultural crops that were still in the fields and the inability to access the interiors of the two buildings. 5.2 GENERAL SITE SETTING The Site is located in the Great Valley Geomorphic Province on the western side of the central San Joaquin Valley. The San Joaquin Valley is a northwest-trending, fault-bounded geosyncline filled with up to six vertical miles of lithified non-marine and marine sediments and non-lithified non-marine sediments. Regionally, the lithology of the upper 3,000 feet of alluvial sediments are derived from the marine and non-marine sediments and Franciscan granitic basement rocks of the Coast Range Mountains to the west and the granitic basement rocks of the Sierra Nevada Mountains to the east. The Coast Range Mountains are approximately 2 miles west of the Site and the Sierra Nevada Mountains are approximately 50 miles northeast of the Site. The United States Department of Agriculture mapped three soil types at the Site. These are the Stomar clay loam, a very deep and well drained soil derived from sedimentary rock sources; the Capay clay soil, a very deep and fine textured soil that has been subjected to artificial wetness; and the Reiff loam, which is a deep and well drained soil that is derived from mixed rock sources. The Reiff loam is found along Mountain House Creek. According to published geologic maps, surface deposits underlying the Site consist of Quaternary alluvial fan deposits. IL a CONDOR