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TABLE 1. COMPARISON OF IN-WELL AIR STRIPPING (ART) AND PUMP AND TREAT <br /> SYSTEM INSTALLATION <br /> Remedial wells Two new 6"wells for both methods, but P&T can also use existing 2"wells--advantage P&T <br /> Subsurface plumbing P&T--connection to sanitary sewer&additional PVC pipe needed to connect 2"wells--advantage ART <br /> Subcontractor/vendor Needed for ART installation &maintenance--advantage P&T <br /> service expenses <br /> Regulatory permits Air Quality permit required for ART, water disposal permit for P&T--possibly slight cost advantage for ART <br /> Overall installation costs, Advantage P&T f <br /> including other equipment <br /> SYSTEM TESTING <br /> Pilot tests Needed to size vapor destruction unit and blower and vapor concentrations for ART <br /> Pump test needed to determine optimum pumping rate and hydrocarbon concentrations to be treated--possibly advantage <br /> P&T, depending on duration of in-well stripping test <br /> SYSTEM OPERATION <br /> Equipment costs Pump&compressor rental or replacement equal for both methods--no advantage <br /> If destruction by carbon used for both methods, more frequent replacement of carbon vessels for P&T--advantage ART <br /> If vapor destruction by oxidizer used for ART, rental cost likely to exceed cost of carbon vessels for P&T--advantage P&T <br /> Utility costs Electrical costs higher for ART due to power requirements, blower, &possibly oxidizer for destruction--advantage P&T <br /> Monitoring&sampling ART--monthly monitoring of vapor concentrations/destruction efficiency, vacuum, dissolved OZ,carbon vessels <br /> P&T--weekly sampling of effluent stream, pump operation--advantage ART <br /> Laboratory costs ART--quarterly vapor samples <br /> P&T--weekly water samples--advantage ART <br /> Disposal costs None for ART; minimum $750/month for P&T, but could be higher depending on pumping rate--advantage ART <br /> Well sampling& monitoring Quarterly for both methods--no advantage <br /> Data analysis& reporting Analysis time greater for ART due to inclusion of vapor data--advantage P&T <br />