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03 July I997 <br /> AGE-NC Project No 95-0130 <br /> Page 5 of 9 <br />' 3 1 3 PROPOSED SUPPLEMENTAL FUEL <br /> Supplemental fuel is proposed for the operation of the selected VES unit An automatic air dilution <br />' module adjusts for the optimal combustion parameters by adding oxygen and/or supplemental fuel <br /> Natural gas is readily available on-site A dedicated gas line could be installed by representative of <br /> P G & E that would connect directly to the VES unit Furthermore, a meter would be installed to <br /> Imonitor supplemental fuel consumption <br />' 3 1 4 PROPOSED MONITORING ACTIVITIES <br /> The VES unit will be monitored weekly using a photo-ionization detector (PID) to ensure optimal <br />' destruction of recovered hydrocarbon vapors, and to monitor cleanup progress The PID readings <br /> will be recorded from the influent end of the VES unit, and recorded before and after catalytic <br /> destruction Optimal destruction will depend on four operational parameters combustion <br /> Itemperature, volume of processed vapor, oxygen level and the lower explosive limits (%LEL) <br /> Vapor samples will be collected on a monthly basis The samples will be collected in Tedlar bags and <br /> transported to a state certified laboratory for analysis of total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g) and volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) <br /> Selected vapor samples may also be analyzed for methyl tert butyl ether (MTBE) All analysis will <br /> be performed in accordance with the appropriate EPA and/or DHS methods <br /> During the"start-up" period for the SVE system, organic vapor monitoring will performed on a daily <br /> basis The anticipated start-up period will be approximately one to two weeks <br /> 3 2 PROPOSED IN-SITU AIR SPARGING SYSTEM <br /> IAS is proposed in conjunction with SVE concurrently at the site The proposed IAS system would <br /> consist of a compressor to inject air beneath the water table using air sparging points Approximate <br /> air sparging point locations are depicted in Figure 8 - Proposed Air Sparging Point Locations <br /> The compressor will provide between 3 and 10 pounds per square inch (Psi) of air to each sparge <br /> point The injected air will volatilize dissolved hydrocarbons in ground water, and force hydrocarbon <br /> vapors into the vadose zone, where they can be withdrawn by the SVE system <br /> 3 2 I PROPOSED IN-SITU AIR SPARGING INJECTION POINTS <br /> Installation of five IAS injection points are proposed utilizing a truck-mounted drill rig equipped with <br />