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Mr. Mark Clardy <br /> ' Page 8 <br /> April 3, 2006 <br /> information,and stored in a pre-chilled cooler for transportation to the laboratory. Soil samples <br /> ' will be recorded onto a chain-of-custody(COC)document that will accompany the samples to <br /> the laboratory and will designate the samples to be analyzed. <br /> ' Each borehole will be logged for lithological content using the Unified Soil Classification <br /> System guidelines, and for color,relative moisture content,and other observable distinguishing <br /> characteristics (i.e., color changes,debris,rootlets,or odor). <br /> ' Laboratory Analytical Procedures <br /> ' The samples will be submitted to a State-certified laboratory for analysis. Soil samples for pre- <br /> profiling purposes will be analyzed according to the requirements of the landfill. Leachibility <br /> tests will be conducted on soil samples according to the Designated Level Methodology for <br /> Waste Classification and Cleanup Level Determination published by the RWQCB in 1989. <br /> Based on TPH concentrations, selected soil samples may be analyzed for leachibility according <br /> to the soluble threshold leaching concentration(STLC)test using deionized water. STLC <br /> ' analyses will only be performed on selected samples with detections of TPH-d and TPH-cr. <br /> If you have any questions regarding this letter,please call me at(510)466-7161. <br /> ' Sincerely, <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> Michael Hurd, CHG <br /> Senior Project Manager <br /> ' Enclosures: <br /> Figure 1: Location Map <br /> Figure 2: Vicinity Map <br /> Figure 3: Site Map <br /> ' Attachment 1: Figures and Tables from November, 2005 Investigation Report <br /> 1 <br /> t <br />