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3.2 Conclusions <br /> Based 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 soil at <br /> the facility <br /> The maximum radius of influence observed during soil venting was approximately <br />' 75 feet at a flow rate of 30 cfm, based on vacuum readings observed at several <br /> monitoring points This radius is smaller than that observed during the initial pilot <br /> test, probably due to the current elevated groundwater levels <br /> The results of the air spargtng pilot tests indicate a radius of influence of at least 60 <br /> feet based on DO increases in wells MW-1, PZ-1, PZ-2, MW-4 and MW-7 This <br /> was observed while operating at a flow rate of approximately 8 cfm at 12 pounds per <br /> square inch gauge (psig) pressure or approximately 15 standard cubic feet per minute <br /> (scfm) This radius of influence is larger than previously observed, also probably due <br /> to the current elevated groundwater levels <br /> Pressure readings recorded during the combined test indicated that venting <br />' successfully controlled the migration of sparged air <br /> The vapor samples collected during the combined test indicated mass removal rates <br />�) for BTEX and TPH of approximately 0 002 and 0 04 lbs/hr, respectively <br /> 1 Microbial analyses conducted in 1994 indicate that indigenous bacteria are present <br />' which are capable of degrading the petroleum hydrocarbons present Additional <br /> discussion of microbial activity is included in Section 5 and in Appendix E of this <br /> report <br /> 1 <br /> 1 <br /> Remedial Action Work Plan <br /> Prepared for THE EARTUGRAINs COMPANY Prepared by Philip Services Corp <br /> H 1ENV162400145\ AP61300 doe 9 8131100 <br />