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1 <br /> 1 <br /> California. The Sacramento Valley is composed of in excess of <br /> 25, 000 feet of sediments derived from erosion and uplift of the <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 5' /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. PLATE II, from a <br /> USGS topographic sheet, shows the location of the property in <br />' relation to other nearby features. <br /> SOIL C F T ON: <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 Storie Index, 28, gives it a classification as <br /> poor. PLATE III is a portion of a soils profile map from the <br /> above publication <br /> ' DEPTH TO GROUN WA R: <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 at this location. Based upon published <br /> data, the highest water level in the last 10 years was measured <br /> ' at about 27' bgl at this site. <br /> PRIOR USE OF REMOVED US 'S: <br /> The site had been the location of a gasoline station for many <br /> years; the removed tanks had been used for dispensing gasoline <br /> and storing waste oil. The property is presently being used as <br /> ' an automotive tune-up & repair facility, the dispensing pumps & <br /> associated piping were removed along with the tanks. There are <br /> no records available concerning the dates that the tanks were <br /> installed <br /> SUMMARY OF PRIOR- <br /> December, <br /> IORDece er 1986 - Application filed by Western Meter Service to <br /> remove two (2) 3,000 gallon gasoline tanks and one (1 ) 150 gallon <br /> waste oil tank from the property. <br /> ' 2 <br />