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� Working to Restore Nature <br /> 4�7 <br /> Air-Sparge Test <br /> On October 12, 1992, RESNA conducted air sparging pilot tests at the site The sparge <br /> points were sampled according to the procedures described in Appendix A Data collected <br /> were used to evaluate the feasibility of removing dissolved and residual hydrocarbons from <br /> the capillary fringe and saturated zones beneath the site On October 13, 1992, RESNA <br /> conducted a combined air sparging and vapor extraction test to evaluate if vapor extraction <br /> is capable of capturing the off-gas (induced by air sparging) transmitted to the vadose zone <br /> On December 22, 1992, RESNA performed an additional test due to data gaps encountered <br /> during the initial air sparging pilot test conducted on October 12, 1992 (RESNA, June 21, <br /> 1993) <br /> The results of laboratory analyses for the air-sparge vapor and water samples are <br /> summarized in Tables 5 and 7 Copies of the Chain of Custody Records and results of <br /> laboratory analyses of the vapor and water samples are in Appendix C <br /> 48 Laboratory Analyses <br /> Soil and water samples were submitted to various State-certified laboratories for the <br /> requested analyses Table 8 summarizes the analyses requested, and methods of testing <br /> employed Copies of the Chain of Custody Records and laboratory reports for soil and <br /> groundwater samples are included in Appendix C <br /> 4!9 Installation of Piping for the Remediation System <br /> During October 1993, RESNA observed Triangle, Inc (Triangle) of Sacramento, Califorrua, <br /> excavate trenches and install horizontal piping for the potential remediation system <br /> Location of trenches are presented in Plate 3 <br /> 30003-7 7 <br />