Passive Soil Vapor Extraction - GSI Environmental Inc.

SRNL-STI-2009-00571Rev. 1Table 4.3: Results from Full-Scale Application of Passive Soil Vapor Extraction at the MAPSLSite, SRS, SC.Site NameMAPSLLocationSavannah River Site, Aiken, SCType of Device Utilized Baroball TM MicroBlowerNo. of Wells 8 2No. of Wells per acre 0.3 (estimated) 0.8 (estimated)Zone of Capture16 to 26 ft (using 1 yr of flow Not Reportedevent data);9 to 39 ft (using continuousaverage flow rate)Screened Interval 85 ft (25 to 110 ft bgs) 10 ft (30 to 40 ft bgs)Average Flow Rate2.6 to 7.5 cfm(maximum of 76 cfm)2 cfm(Data from 1 well)Pore Volumes RemovedDuring Operating PeriodNot reportedNot reportedStarting Vapor-PhaseConcentrationEnding Vapor-PhaseConcentrationMass Transfer/RemovalRate (per well)Mass Removed (per well)Mass Removed (cumulative)~ 45 ppmv PCE~ 5 ppmv TCE(Average of 5 wells at peakfollowing switch to PSVEsystem)~15 ppmv PCE< 2 ppmv TCE(Average of 5 wells following4.5 yr of operation)0.03 kg/day PCE;0.03 kg/day TCE;(Average of 2 wells)6.9 to 144 kg of PCE;1.5 to 7.7 kg of TCE307 kg of PCE;29 kg of TCE250 ppmv PCE300 ppmv TCE(Data from 1 well)60 ppmv PCE40 ppmv TCE(Data from 1 well)0.06 kg/day PCE;0.03 kg/day TCE;(Average of 2 wells)37 kg of PCE;21 kg of TCENot reportedCost Not reported Not reported30 Enhanced Attenuation TechnologiesPassive Soil Vapor Extraction