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l } r commercial complex, restaurant, and a residential -neighborhood. Waterfront of the ' Stockton deep water channel is approximately 600 feet south of the site. Approximately 0.7 7 miles to the east is City Hall and Interstate 5 is located 0.4 miles to the west. Refer to PLATE I, for more specific details. I GEOLOGIC AND GEOMORPHIC PROVINCE: The site is located near the southern end of the Sacramento Valley, a sub-province of what 1 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 Sierra € Nevada Batholith to the east. The sediments range in age from recent to cretaceous and f possibly older, and consist of sands, gravels,.silts, and clays produced by repeated reworking of the outwash from the Sierras. i� Relief in the vicinity of the site is relatively flat, 5'/mile or less, with drainage to the west - southwest towards the Sacramento/Stockton Delta area. The Stockton Deep Water Channel is about 600 feet to the south, Weber Point at the east end of the Deep Water F`. Channel. is approximately 1/2 mile west, and Mormon Slough is about 1600 feet south of the site. PLATE II, from USGS topographic sheet, shows the location of the site in relation to other nearby features. SOILS CLASSIFICATION: I: f► According to the 1952 publication issued by the University of California, Berkeley, the soil , in this area is known as the Stockton Adobe Clay. It is 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. DEPTH TO GROUNDWATER: } i � t Referring to the Fall 1992 water table map issued by the San Joaquin Flood Control District, PLATE IV, groundwater was recorded at approximately 45 feet below ground level at this site. The highest water levels measured in the Iasi 10 years at this location were about 23 to 26 feet below ground level in the spring and fail of 1983, according to data published by the SJFCD. The regional groundwater gradient is indicated to be to the east, } r however, it maybe rather flat in the vicinity of the site and tend to oscillate. } r, i LOCATION OF NEARBY WELLS: l The wells that the Flood Control District uses for water level measurements are shown on the attached PLATE V. Within a mile radius of the site are three (3) Department of Water Resources wells 4J2, 3K1, and 10R1; there is also one (1) San Joaquin County well I IE2. According to Margaret Lagorio with the San Joaquin County Department of Environmental Health Services, there are no known monitoring wells within the "area of influence" for this site. 2 . y