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Project No. 013-10101 <br /> Page No. 3 <br /> If a higher level of due diligence is desired relative to potential subsurface impacts associated with the <br /> former on site hydraulic hoist, Krazan could conduct a limited subsurface soil assessment to assess the <br /> presence or absence of petroleum hydrocarbons and polychlorinated biphenyls in the vicinity of the <br /> former hoist. <br /> 4.0 REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The subject site is located within the San Joaquin Valley, a broad structural trough bound by the Sierra <br /> Nevada and Coast Ranges of California. The San Joaquin Valley, which comprises the southern portion <br /> of the Great Valley of California, has been filled with several thousand feet of sedimentary deposits. <br /> Sediments in the eastern valley, derived from the erosion of the Sierra Nevada, have been deposited by <br /> major to minor west-flowing drainages and their tributaries. Near-surface sediments are dominated by <br /> sands and silty sands with lesser silts, minor clays, and gravel. The sedimentary deposits in the region <br /> form large coalescing alluvial fans with gentle slopes. <br /> According to the State of California Department of Water Resources(DWR)map entitled"Lines of Equal <br /> Elevations of Water in Wells, Spring, 2007' groundwater in the area is reported to be first encountered at <br /> a depth of approximately 50 to 55 feet bgs. The groundwater flow direction in the area of the subject site <br /> is generally towards the east. <br /> 5.0 PURPOSE AND SCOPE OF WORK <br /> The purpose of the Phase II LSI is to preliminarily assess the subsurface soil at the locations of the active <br /> and inactive wash racks and associated clarifiers/drains, and the inactive hydraulic hoist based on the past <br /> industrial uses of the subject site since the early-1970s. The scope of work includes advancing vertical, <br /> direct-push soil borings in the areas of environmental concern for the collection of base samples from <br /> each borings for submittal to a State-certified analytical laboratory for chemical analysis of petroleum <br /> hydrocarbons,volatile organic compounds, selected heavy metals, and polychlorinated biphenyl fluids to <br /> assess the presence or absence of subsurface impacts from the referenced constituents. <br /> Based on the results of this subsurface investigation,the need for further investigation, if necessary,will <br /> then be evaluated. <br /> 6.0 METHODOLOGY <br /> KRAZAN&ASSOCIATES,INC. <br /> Conducting Assessments Nationwide <br /> 1310101 United Rentals Workplan <br />