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1 <br />' Project No S8080-06-OIC <br /> August 31, 1994 <br />' During the drilling activities, the materials encountered were described and logged by a State <br /> of California Registered Civil Engineer, and classified utilizing the Unified Soil Classification <br />' System Copies of the logs of the exploratory borings are presented in Appendix B <br />' Soil samples were obtained from the core samples at selected intervals by hand driving brass <br /> sample tubes The samples were then capped, labeled, chilled, and submitted to Excelchem <br /> Environmental Laboratories utilizing standard chain-of-custody procedures Twenty-six soil <br /> ' samples obtained from the borings were analyzed for TPHg, TPHd, TPHmo, and BTEX A <br /> ' summary of the soil sample laboratory test results are presented on Table IV The results of <br /> the laboratory testing are discussed hereinafter in Section Four of this report <br /> ' Headspace Surveys <br /> Headspace surveys were performed during the drilling activities by placing soil in a ziplock <br /> ' plastic bag and sealing the contents The contents of the bag were then agitated, and an <br /> organic vapor concentration of the headspace of the bag was measured utilizing an HNU <br /> ' <br /> vapor <br /> organic analyzer equipped with a photo ionization detector (PID) The results of the <br /> g p Y <br /> ' headspace surveys are presented on the descriptive logs of the exploratory borings in <br /> Appendix B Headspace surveys were not performed on soil samples below a depth of 20 feet <br /> during the drilling of boring GB-5 due to a malfunction of the PID <br /> - 26 - <br /> 1 <br />