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1 <br /> 1 <br /> REGIONAL GEOGRAPHIC SETTING_; <br />' The property is situated in a primarily residential area of the <br /> city of Stockton, approximately midway between Interstate I-5 to <br /> the west & Highway 99 to the east . City Hall & County Government <br />' buildings are about 1 1/2 miles to the south, and the University <br /> of the Pacific is a short distance to the northwest . <br /> tGEOLOGIC & GEOMORPHIC PROVINCE- <br /> The site is located near the southern end of the Sacramento <br />' Valley, a sub-province of what is known as the Great Valley of <br /> California The Sacramento Valley is composed of in excess of <br /> 25, 000 feet of sediments derived from erosion and uplift of the j <br /> Sierra Nevada Batholith to the east . The sediments range in age <br /> from Recent to Cretaceous & possibly older, and consist of sands, <br /> gravels, silts, & clays produced by repeated reworking of the <br /> outwash from the Sierras . <br /> Relief is very flat, less than 51 /mile, with drainage to the <br /> southeast towards the Sacramento-Stockton Delta area . The <br /> Calaveras River is about one mile to the north-northeast, and <br /> Mormon Slough -is roughly 2 miles to the south. <br /> SOIL CLASSIFICATION: <br />' According to the 1952 publication issued by the University of <br /> California, Berkley, the soil is this area is known as Stockton <br />' Adobe Clay. It is a dark grey to brown alluvial soil derived as <br /> outwash from basic igneous sources, (ie, the Sierra Nevada Bath- <br /> olith ) It is considered to have imperfect drainage, having <br /> hardpan subsoil layers generally underlain with unconsolidated <br /> material The Stori.e Index, 28, gives it a classification as <br /> poor <br />' DEPTH TO GROUNDWATER: <br /> Based upon the spring 1993 water table map issued by the San <br />' Joaquin County Flood Control District, groundwater was measured <br /> at between 60 ' & 70 ' bgl in this area. Based upon published <br /> data, the highest water level in the last 10 years was measured <br /> at about 271 bgl . Groundwater was located at about 53 ' below <br />' grade during purging & sampling operations conducted in October, <br /> 1994 . Groundwater measurements during quarterly sampling in <br /> October, 1995, showed an average depth of 46 93 ' below grade <br /> PRIOR USE OF REMOVED UST' S : <br /> The site had been the location of a gasoline station for many <br /> 2 <br />