Laserfiche WebLink
' 12 July 2006 <br /> i AGE-NC Project No 95-0130 <br />' Page 12 of 14 <br /> • The lateral and vertical extent of the dissolved petroleum hydrocarbon plume Is not known <br />' toward the northwest,northeast,east and southeast of the area bound by wells MW-1 through <br /> MW-7 (Figures 5 through 8) <br />' Based on SVE remediation data collected between 07 December 2005 and 14 March 2006, AGE <br /> concludes <br />' • Analytical results of SVE Inlet vapor concentrations ranged between 1,300 µg11 and 2,000 <br /> µg11, the average SVE Inlet vapor concentration was approximately 1,567 µg/l <br />' • An overall decline in hydrocarbon vapor concentrations was evident between the fourth <br /> quarter 2005 and the first quarter 2006 monitoring events,benzene concentrations declined <br /> I to non detect levels and toluene-ethylbenzene-xylene concentrations are approaching non <br /> detect levels A plot of the Influent TPH-g concentrations versus time is Included in <br /> Appendix G <br /> • The average SVE inlet flow rate was approximately 90 cubic feet per minute, the average <br /> differential pressure measurements were recorded at 2 90 Inches of water (Table 6) <br /> lie • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 188 gallons (equivalent to 1,178 pounds) of petroleum hydrocarbons <br /> (Appendix I) between the 07 December 2005 and the 14 March 2006 monitoring periods <br /> (Table 7) <br /> • Since Initiation of the SVE system in August 2004, the total volume of petroleum <br /> hydrocarbons extracted is estimated to be approximately 2,898 gallons (Table 7), while the <br /> total mass is estimated at approximately 18,120 pounds of extracted petroleum hydrocarbons <br /> The results of pump and treat ground water remediation between 06 December 2005 and 14 March <br /> 2006 are as follows <br /> • <br /> Between 06 December 2005 and 14 March 2006, approximately 312,935 gallons of <br /> hydrocarbon-impacted ground water were extracted from wells EW-1, EW-2, VW-1C, <br />' VW-2A and VW-3A (Table 9) <br /> • Dissolved TPH-g was detected from grab samples collected at the Influent end of the <br /> treatment system at concentrations as high as 39,000 µg11, benzene concentrations as high <br /> as 7,200 µg11 and MTBE concentrations as high as 1,600 µg11 Laboratory analysis of grab <br /> water samples collected from the P&T effluent did not detect any constituents of concern <br /> during the first quarter 2006 (Table 9) <br /> IAdvanced GcoEnvirunmeulal,Inc <br />