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U. S Can Company
<br /> 35275 Hivy. 33, Vernalis; California January 3, 2996
<br /> Preliminary Site Characterizarion Report of Findings Page: 3
<br /> 3.2 Requester[Analyses
<br /> The sample from the exploratory trench,ES-1 @ 14', was collected for laboratory analysis and
<br /> analyzed using EPA method 8015 for TEPH (Total Extractable Petroleum Hydrocarbons) as
<br /> Diesel and Motor Oil, and EPA Method 8010/8020 for Halogenated Volatile
<br /> Organics/Aromatic Volatile Organics(Table 1). The five(5) composite samples, SP-1, 2, 3, 4,
<br /> and 5, from the spoils pile, were also collected for analysis and a:alyzed by EPA Method 8015,
<br /> EPA Method 8010/8020, and EDA Method 6010/STLC for Metals (Table 2). Chain of
<br /> Custody records were maintained at all times(Appendix A).
<br /> 3.3 Analytical Findings
<br /> Contaminants were identified within the exploratory trench as reported by sample ES-1
<br /> . @ 14' (Table 1). ES-1 @ 14' tested 8,600 mg/kg Diesel, 3,400 mglkg Motor Oil, 290
<br /> gg/kg Benzene, 18,000 ,ugikg Ethylbenxene, 5,000 jog/kg Toluene, 3,600 Jog/kg
<br /> Xylene, and 320 gg/kg Trichloroethene. The waste pit contents tested 120 mg/kg
<br /> Motor Oil, 7.5 µ2lkg Ethylbenzene, 5.7 uelkg Toluene, 29 ,ug/kg Xylene, 19 Mcg/kg
<br /> 1,1,l-Trichloroethane, 7.4 mg/kg Arsenic, 1,300 mg,/l:g Barium, 9.7 mg/kg Cadmium,
<br /> 9.1 mg/kg Cobalt, 310 mg/kg C;omiu:n, 2,800 mg/l:g Copper, 0.073 mg/kg Mercury,
<br /> 77 µg/kg hlolybdemun, 97 mg/kg Nickel, 8,100 mg/kg Lead, and 10 mg/kg
<br /> Antimony.
<br /> 4.0 Geology
<br /> Vernalis lies in the Central Valley Physiographic Province of California. The Valley is about 40
<br /> miles wide. It is bounded to the west by the foothills of the Coast Ranges, and to the east by the
<br /> foothills of the Sierra Nevada Range. The Vernalis area is nearly devoid of structural geologic
<br /> features.
<br /> The Valley is floored by unconsolidated Quaternary sediments to depths of at least 400 or more
<br /> feet in the Vernalis area. All of these units can be considered soils in the engineering sense,
<br /> because they are unconsolidated. Quaternary sediments in the Central Valley were deposited as a
<br /> series of coalescing alluvial fans. The 'fans originated where galleys of the major streams which
<br /> drained the Sierra Nevada Range emptied into the broad expanses of the valley. The coarser
<br /> sediments which comprise the fans are mainly arkosic in composition and were derived from
<br /> erosion associated with glacial stages in the mountains. The finer grained sediments are
<br /> predominantly composed of rock flour washed out of the former extensive glaciers in the Sierras,
<br /> (Arlley, 1964).
<br /> The axis of the Central Valley Trough was a marshy, wet area throughout much of the Pleistocene
<br /> Epoch. Lacustrine, flood plain and marshy depositional environments predominated along the
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