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1 <br /> TABLE 1 <br /> ANALYTICAL RESULTS OF TANK REMOVAL SOIL SAMPLES <br /> Ripon Farm Service <br /> June 15, 1987 <br /> (mglkg) <br /> tTotal volatile <br /> Petroleum <br />' Sample I D Hydrocarbons Benzene Xylene Toluene <br /> RFS-1 69 ND 13 ND <br />' RFS-2 15 0 8 25 ND <br /> RFS-3 17 ND ND ND <br /> RFS-4 ND ND ND ND <br /> ,ng&g =ppm,parts per on <br /> ' ND=Not Detected <br /> results of the soil samples are summarized in Table 1 (as reported by Canome <br /> ' Environmental) <br /> A letter from the San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS/EHD) dated March 7, 1994, states that "the former underground storage <br /> tank(s) cannot be recommended for final closure without further investigation to determine <br /> the full extent of the soil and/or groundwater problem " Therefore, a preliminary site <br /> assessment of the property will be required to determine if soil or groundwater <br /> contamination is present at the site <br /> ' 2.3 Regional Geological Setting and Hydrogeology - <br /> The Site is situated within the Great Valley Geologic Province of California The Great <br /> Valley is composed of a nearly flat alluvial plain which extends from the Tehachapi <br /> Mountains in the south and to the Klamath Mountains in the north. The western and <br /> eastern boundaries of this province are composed of the California Coast Range and the <br /> ' Sierra Nevada Mountains,respectively The Great Valley Province is divided into two major <br /> divisions which are identified as the Sacramento and San Joaquin Valleys <br /> ' The Site is located in the San Joaquin Valley region in an area known as the Stockton Arch, <br /> a distinct geological structure which divides and separates the valleys by a faulted trans- <br /> valley Cretaceous high (U S Geological Survey Professional Paper 1401-C) The Stockton <br /> ' Arch extends from the Sierran Slope across to the Diablo Uplift and was formed during the <br /> Eocene and possibly continuing through the Miocene <br /> ' Structurally, the Site is located in a large, elongate northwest trending asymmetric structural <br /> Rrm sc �ws s <br />