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%Nov v REGIONAL GEOGRAPHIC SETTING: La The property is located in an industrial and commercial area with some small businesses. It is also surrounded by low cost residential housing. It lies between Highway 99 to the east and Interstate 5 to the west. City Hall and other government buildings are ,r approximately 1 mile to the northwest. Mormon Slough is immediately north of the property and the A.T.&S.F.R.R. track runs parallel to the southern boundary of the property, refer to PLATE 1 for details. GEOLOGIC AND GEOMORPHIC PROVINCE: The site is located near the southern end of the Sacramento Valley, a sub-province of what is known as the Great Valley of California. The Sacramento Valley is composed of in excess of 25,000 feet of sediments derived from erosion, reworking, and uplift of the La Sierra Nevada Batholith to the east. The sediments range in age from Recent to Cretaceous and possibly older, and consist of sands, gravels, silts, and clays produced by repeated reworking of the outwash from the Sierras. Relief in the vicinity of the site is relatively flat, Y/mile or less, with drainage to the west- southwest towards the Sacramento/Stockton Delta area. Weber Point at the east end of the Stockton Deep Water Channel is approximately one mile to the northwest of the site and Mormon Slough runs along the north boundary of the property. PLATE 11, from a .. USGS topographic sheet, shows the location of the site in relation to other nearby features. r- SOILS CLASSIFICATION: According to the 1952 publication issued by the University of California, Berkeley, the `' soil in this area is known as Stockton Adobe Clay. It is a dark gray to brown alluvial soil derived as outwash from basic igneous sources, (i.e. the Sierra Nevada Batholith). It is considered to have imperfect drainage, having hardpan subsoil layers generally underlain with unconsolidated material. The Storie Index, .28, gives it a classification as poor. PLATE III is a portion of a soils profile map from the above publication. It was noted, however, at the time of excavation, that the site was apparently a low elevation area that had been filled in with all types of materials, i.e. huge pieces of demolished steel reinforced concrete, asphalt, brickwork, lumber scraps, glass shingles, tiles, and etc. This �. fill material was encountered from just below the asphalt surface to approximately 17 feet below ground elevation. �. 2