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REGIONAL GEOGRAPHIC SETTING: • The property is located in a primarily small business area of the city of Stockton slightly Y west of midway between Highway 99 to the east, and Interstate 5 to the west City hall and other government buildings are approximately I mule to the northwest Refer to PLATE I 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 Sierra Nevada Batholith to the east The sediments range in age from Recent to Cretaceous and possibly older, and consist of sands, gravels, salts, and clays produced by repeated reworking of the outwash from the Sierras Relief in the vicinity of the site is relatively flat, 5'/male 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 3/4 male to the west, and Mormon Slough is about 1/2 mile to the south PLATE H, from a USGS topographic sheet, shows the location of the site in relation to other nearby features SOIL 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 Stone 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: Referring to the fall 1992 water table map issued by the San Joaquin Flood Control District, PLATE IV, groundwater was recorded at between 67' and 77' bgl at this location The regional gradient is indicated to be to the east-northeast, however, this may change locally Based on published data, the highest water levels measured in the last 10 years at this site were about 35' bgl in both the spring and fall of 1983 30'�86 LOCATION OF NEARBY WELLS: The wells that the Flood Control District uses for water Ievel measurements are shown on the enclosed PLATE V, which indicates that there are no control wells in the immediate vicinity of the site The nearest wells appear to be approximately one mile away Time constraints �i 2