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i <br /> Site Assessment Report <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> March 18, 2010 <br /> 3.3 WASTE DISPOSAL <br /> L <br /> Soil cuttings and rinsate water generated during drilling operations were containerized in <br /> 55-gallon drums and temporarily stored on the subject property pending characterization and <br /> disposal. Purge water generated during groundwater developments from the newly installed <br /> groundwater monitoring wells were containerized in 55-gallon drums and temporarily stored for <br /> disposal. On December 22, 2009, rinsate and purge water was removed from the subject <br /> property and disposed of at Chemical Waste Management in Kettleman Hills, California. On <br /> December 22, 2009, soil cuttings were removed from the subject property and properly <br /> disposed of'at Republic Services in Livermore, California for disposal. Manifests are included in <br /> L Attachment H. <br /> 3.4 WELL SURVEY <br /> L On November 23, 2009 Muir Consulting, Incorporated Muir surveyed to of casing and ground <br /> 9 P (Muir) Y P 9 9 nd <br /> surface elevations at the newly installed monitoring wells (MW-6 and.MW-6D) using the North <br /> American Vertical Datum of 1983 (NAVD83). The environmental well survey map provided by <br /> Muir is included in Attachment I. <br /> C 4.0 RESULTS <br /> 4.1 SOIL CHEMISTRY <br /> Soil analytical results were compared to the 'San Francisco Regional Water Quality Control <br /> Board (RWQCB Region 2) Environmental Screening Levels (ESL)for residential land use where <br /> groundwater is not a current or potential use of groundwater, Table D-1, dated November 2007, <br /> revised May 2008. Soil analytical results are presented in Table 3. None of the soil samples <br /> collected and analyzed contained concentrations above the ESLs for any analytes. <br /> 4.2 GROUNDWATER CHEMISTRY <br /> C <br /> Groundwater analytical results were compared to the Maximum Contaminant Levels for Drinking <br /> Water Standards: Department of California Health Services (MCL). Analytical results for the <br /> recent event are summarized in Table 4. Maximum and minimum concentrations of petroleum <br /> hydrocarbon constituents detected in the groundwater samples are summarized in the table <br /> below: <br /> C <br /> \\CA5FP\Data\Aproject\ENV\CHEVRON\309075\6 Deliverables\Reports\DG Wells Assessment\Assessment'Report_4741010950.doc 6 <br />