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%40 11*04 <br /> The property is located on Cherokee Road, about 1/2 mile <br /> southwest of Highway 99, and a short distance west of the <br /> Stockton Diverting Canal . See PLATS I for details . <br /> GEOLOGIC & GEOMORPHIC PROVINCE: <br /> The site is located in the southern portion of what is commonly <br /> referred to as the Sacramento Valley, which is the northern <br /> portion of the Great Valley of California. Sediments consist of <br /> upwards of 20, 000 feet of sands, silts, & clays ranging in age <br /> from recent to Upper Cretaceous & possibly older. These <br /> sediments have been derived primarily from outwash & erosion of <br /> the Sierra Nevada Batholith to the east . Drainage is to the <br /> southwest at about 5 ' /mile. PLATE II, from a portion of the <br /> Stockton West quadrangle published by the USGS, shows more <br /> details of the area. <br /> SOIL TYPE: <br /> Soils in the area are classified as Stockton Adobe clay by the <br /> University of California Agricultural Extension. It is derived <br /> from outwash from basic igneous sources, (Sierra Nevada <br /> Batholith, ) generally has imperfect drainage, with hardpan <br /> subsoil layers underlain with unconsolidated material . It is <br /> usually dark grey to tan to brown, with a Storie Index of 28 . <br /> PLATE III is from that University of California publicaton. <br /> DEPTH TO GROUNDWATER: <br /> Groundwater was measured at about 80' bgl based upon the Fall, <br /> 1994 map issued by the San Joaqun County Flood Control District . <br /> Based on other more recent data, water levels may have risen 5 ' <br /> or more in this area. The highest levels measured during the <br /> last 15 years was during the Spring of 1983 & 1986; between 45 ' & <br /> 47 ' below ground surface. <br /> BRIEF REVIEW OF PRIOR WORK: <br /> December, 1989 - two (2) 8, 000 gallon gasoline UST' s & associated <br /> product lines were removed from the property. Soil samples <br /> revealed very minor amounts of xylene; refer to EXHIBIT A for <br /> copies of those analyses . <br /> March 15, 1995 - San Joaquin County EHD notified owner that <br /> additional investigative work would be required in order to <br /> obtain site closure; (refer to EXHIBIT B for a copy of that <br /> correspondence. ) <br /> 2 <br />