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Conclusions <br /> tBased on the information collected during the pilot testing and the physical <br /> properties of the hydrocarbon compounds, soil venting and air sparging are the <br /> recommended technologies for remediation of the impacted groundwater and <br /> soil at the facility <br /> The maximum radius of influence observed during soil venting was <br /> tapproximately 120 feet at a flow rate of 28 cfm at 54 in H2O vacuum based on <br /> vacuum readings observed at several monitoring points <br />' The results of the air sparging pilot tests indicate a radius of influence of <br /> approximately 30 feet based on DO increases in wells PZ-1 and PZ-2, at a flow <br />' rate of approximately 6 cfm at 35 pounds per square inch gauge (psig) <br /> pressure or approximately 20 standard cubic feet per minute (scfm) <br /> Pressure readings recorded during combined venting and sparging indicate that <br /> venting successfully controlled the migration of sparged air <br /> The vapor samples collected during the first vent test indicated a final removal <br /> rate ofBTEX and TPH of 0 31 and 2 75 lbs/hr, respectively <br /> Groundwater samples collected from MW-1, PZ-1, and PZ-2 indicated a <br /> general decrease in the concentrations of BTEX and TPH in all of the wells <br /> sampled The decreases observed in PZ-1 and PZ-2 were greater than that <br /> observed as normal fluctuation at the facility and is likely a result of <br />' volatilization and biological degradation promoted by air sparging <br /> Microbial populations increased considerably in wells PZ-1 and PZ-2 and <br /> decreased slightly in well MW-1 during pilot testing The increase is likely a <br /> result of the increase in DO from air sparging activities The cause of the slight <br />' decrease in MW-1 is not known <br /> 2/95/8112i382\125997\FRP_PILT APP <br />