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• REGIONAL SETTING The property is located on the southeast corner of Grant Street & Charter Way, (State Highway 4, ) in the southern part of the city of Stockton. Highway 99 2s about 2 miles to the east, and I-5 is one mile to the west. Mormon Slough, which drains into the Stockton Deep Water Channel , is about 1/2 mile to the north. The area is primarily residential and light commercial; the property had been used as a gasoline station, but is presently unoccupied. Refer to PLATE I for details. GEOLOGIC & GEOMORPHIC PROVINCE- The site is located just to the east of the San Joaquin Delta area, at the southern end of what is referred to as the Sacra- mento Valley, which is the northern portion of the geomorphic Provence known as the Great Valley of California. The relief is very low, with a slope of less than 2% towards the west. The major waterways are the Calaveras River to the north, the Stockton diverting canal to the east, and Duck Creek to the south. PLATE JI is a portion of a USGS topographic sheet showing pertinent features. SOIL CLASSIFICATIQN_: According to the 1952 publication issued by the University of California, the major soil type in this area is the Stockton Adobe Clay, which is quite extensive in this area. It was formed by older flood plain & terrace deposits, and is generally dark gray in color, with a hardpan subsoil & underlain by unconsol- idated material. However, the sediments encountered during excavation and in the soil borings & monitoring wells contained considerable sandy clays & clayey sands. The color of both the clays and sandy clays was predominantly tan to buff, with lenses of gray to brown hardpan & occassional carbonaceous plant materialPLAT M is a portion of a sheet from that Publication. DEPTH TQ GROUND-NAM: During quarterly monitoring and sampling operations conducted in March, 1993, the water table was measured at about 53' bgl; it had risen approximately 2 feet since October of last year. A review of County Flood Control District maps revealed that during the Spring of 1986, UIAT IS, highest water levels in the area during the past 10 years, ) groundwater was measured at about 35' bgl, some 18' higher than at present. • 2