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The volatile fuel tivarocarbon rvFu' concentr4tio*i was monitored in extractea "apers from each well using a photo ionization detector(PID) Based on the PID readings high vacaurn dual Phase extraction remeaial acnon was conducted using existing vapor extraction well 'N1W2 as a source extraction well Wells 1v1W1. MW3, MWa, VEW1 VEW2 and VEW3 were utilized as observation wells for the test The remedial action was conaucted during monthly events each having a duration of approximately five days or forty hours Vacuum influence and depth to ' water was monitored at the observation wells to evaluate the radius of vacuum influence and groundwater drub=r do—n DYunn4 the remedial action the soil gas oxygen ccnc-ontration was monitored using a GasTechT'i combustible vapor analyzer The VFH concentration was ' monitored with a PID During the events, soil gas samples were collected in TedlarTm bags for laboratory analysis for VFH, BTEX and V1TBE using EPA Test Method TO-14 The high vacuum dual phase extraction remedial action was conducted using mobile extraction equipment having a 3-HP liquid-ring blower and associated flow rate and pressure measuring equipment Three carbon canisters in series were utilized to treat the off-gas during the remedial events prior to venting to the atmosphere Vapor analytical results are summanzea in Table 4, and laboratory data sheets are presented in Appendix C ' 42 Vacuum Extraction Results - Event#2 (June— October 2005 ' Vapor analytical results indicate the TPHg and BTEX were detected in each of the influent vapor samples MTBE was detected in the vapor samples collected during the first two vapor extraction testing days conducted on June 27 and June 29 MTBE was not detected during the remaining e emediation events e he highest concentrations of BTEX were detected during the September extraction episo e, approximately twice as high as the June 2005 event During the three sampling episodes conducted during the June - October 2005 event (Reporting Event #2) , respectively, BTEX constituents decreased over the course of each respective week-long 40 hour episode, however, concentrations then rebounded during the initial day of subsequent extraction episodes Vapor analytical results from samples collected during the remediation events performed from June 2005 to September 2005 (Event#2) and October 2004 to Apnl 2005 (Event #1) are summarized in Table 4 Copies of field notes are contained in Appendix A ' Calculations The results of the analytical tests on the vapor samples are presented in Table 4 in parts per ' million by volume (ppmv), which is the ratto of a target analyte concentration with respect to a volume of medium being sampled, generally expressed in terms of the medium being sampled In this case, the sample medium is air vapor Therefore, an analytical result of I ppmv TPHg (for example) would be equivalent to 1 part TPHg vapor per 1 million parts air vapor The mass - removed by vapor extraction was determined by the following calculation 4 s 5enviromentat162577-Diesel PerAreports%anrertm-ren42 doc