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11 August 1997 AGE-NC Project No. 95-0118 Page 5 of 9 directly to the VES unit. Furthermore, a meter would be installed to monitor supplemental fuel consumption. .3.1.4. PROPOSED MONITORING ACTIVITIES The VES unit will be monitored weekly for organic vapor (OV) using a photo-ionization detector (PID) to ensure optimal destruction of recovered hydrocarbon vapor, and to monitor cleanup progress; initially, OV measurements will be collected more frequently until the system has stabilized. PID measurements will be recorded from the influent and effluent of the VES unit. Vapor samples will be collected on a monthly basis. The samples will be collected in Tedlar bags and transported to a State certified laboratory for analysis of total petroleum hydrocarbons quantified as gasoline(TPH-g),methyl tertiary butyl ether(MTBE) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTE&X). All analyses will be performed in accordance with the appropriate EPA methods. During the "start-up" ,period for the SVE system, organic vapor monitoring will performed on a daily basis. The anticipated start-up period will be approximately one to two weeks. 3.2. PROPOSED IN-SITUAIR SPARGING SYSTEM IAS is proposed in conjunction with SVE concurrently at the site. The proposed IAS system would consist of a compressor to inject air beneath the water table using air sparging wells. Approximate air sparging well locations are depicted in Figure 2. The compressor will provide from one to four cubic feet per minute (cfm) of air, at a pressure of approximately 15 to 20 pounds per square inch (psi) to each sparge point. The injected air will volatilize dissolved hydrocarbons in ground water, and force hydrocarbon vapor into the vadose zone, where it can be withdrawn by the SVE system. 3.2.1. PROPOSED IN-SITU AIR SPARGING INJECTION WELLS Installation of four IAS injection wells are proposed. Each IAS injection well will be installed using a truck mounted,hollow stem drill rig and 8-inch hollow stem augers. During drilling activities, soil borings will be advanced to depths of approximately 45 feet bsg. All hollow 'stem augers will be steam-cleaned prior to advancement in each borehole. Cuttings generated during drilling activities will be stockpiled on-site; rinseate will be containerized in properly labeled 55-gallon drums, and stored on-site. Proposed well locations are depicted on Figure 2. Advanced GeoEnvironmental,Inc.