ARCHIVED REPORTS_XR0005583 - Laserfiche WebLink

Home Browse Search

08 April 2005 AGE-NC Project No 95-0173 ' Page 6 of 10 34 SOIL VAPOR EXTRACTIONAN-SITU AIR SPARGE REMEDIATION FINDINGS From field and laboratory data collected at the SVE remediation system between 23 September and 22 December 2004, AGE determined the average TPH-g concentration and the average flow rate, and calculated the approximate mass and volume of hydrocarbons removed 3 4 1 Results of Soil Vapor Extraction Between 23 September and 22 December 2004, the SVE remediation system was operational for approximately 2,160 hours(Tables 6 and 7) The IAS system cycled or operated contemporaneously with the SVE system During this operational period, SVE inlet flow rates were observed to average approximately 74 cubic feet per minute (cfm)from differential pressures observed between 1 8 and 2 0 inches of water, with Induced vacuum measurements observed between 53 and 65 inches of water Utilizing a PID,petroleum hydrocarbons were measured at concentrations as high as 238 parts per million(ppm)at regular Intervals at the SVE Inlet Field measurements are summarized in Table 6 r• 3 4 2 Analytical Results of Vapor Extraction Air Flow Samples Influent and effluent SVE air flow samples were collected on 25 October, 22 November, and 22 December 2004 TPH-g was detected in the influent SVE air flow samples at concentrations of 980 µg/1, 580 µg/l, and 320 µg/l, respectively TPH-g was also detected in the October and November effluent air flow samples at concentrations of 510 µg/l, 300 µg/1 and 190 µg/l, respectively BTEX constituents were detected in the October influent SVE air flow samples at concentrations of 2 9 µg/1 benzene, 3 7 µg/1 toluene and 80 µg/1 xylenes,xylenes were also detected in the November and December samples at concentrations of 35 µg/1 and 12 µg/1, respectively Low concentrations of BTEX constituents were detected In the October 2004 effluent SVE air flow samples at concentrations as high as 1 5 µg/1 benzene, 4 9 µg/l toluene, 0 94 µg/1 ethylbenzene and 33 µg/1 xylenes, xylenes were also detected in the November sample at a concentration of 7 µg/1 Analytical results of SVE air samples are summarized in Table 5 The GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files are Included In Appendix B, the laboratory reports (CAL reference no 7495 and CTEL laboratory I D 0411-161 and 0412- 190), QA/QC reports,and chain of custody forms are presented in Appendix E, a plot of laboratory analyses of SVE influent TPH-g air stream concentrations versus time is included in Appendix F EAdvanced GeoEnwronmental,Inc