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l <br /> I02 June 2005 <br /> AGE-NC Project No 95-0130 <br /> Page 12 of 13 <br /> differential pressure measurements were recorded at 140 Inches of water (Table 6) <br /> • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 514 gallons (equivalent to 3,210 pounds) of petroleum hydrocarbons <br /> (Appendix I) between the 22 December 2004 and the 08 March 2005 monitoring periods <br /> (Table 7) <br /> I • Since Initiation of the SVE system in August 2004, the total volume of petroleum <br /> hydrocarbons extracted is estimated to be approximately 2,220 gallons (Table 7), while the <br /> total mass is estimated at approximately 6,293 kg, or approximately 13,876 pounds of <br /> Iextracted petroleum hydrocarbons <br /> I The results of pump and treat ground water remediation between 29 December 2004 and 08 March <br /> 2005 are as follows <br /> I • Approximately 81,280 gallons of hydrocarbon-impacted ground water were extracted from <br /> wells EW-1 and EW-2, which were completed in the First Zone aquifer (Table 9) <br /> • Dissolved TPH-g was detected from grab samples collected at the influent end of the <br /> I . treatment system at concentrations as high as 110,000 µg/1,benzene concentrations as high <br /> as 13,000 pg/1 and MTBE concentrations as high as 22,000 µg/1 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 2005 (Table ) <br /> • Between 29 December 2004 and 08 March 2005, an estimated 44 pounds of petroleum <br /> Ihydrocarbons were extracted from ground water(Table 9) <br /> • A significant increase in P&T influent concentrations was evident between the fourth quarter <br /> I 2004 and the first quarter 2005 monitoring events, a plot of the influent TPH-g <br /> concentrations versus time is included in Appendix L <br /> • Since Initiation of the P&T system in November 2004, the total volume of petroleum <br />' hydrocarbon-impacted water extracted is estimated to be approximately 116,640 gallons <br /> (Table 7), the mass of petroleum hydrocarbons removed from the above total volume of <br /> I 116,640 gallons is estimated at approximately 26 kg, or approximately 58 pounds of <br /> extracted petroleum hydrocarbons <br /> 6.0. RECOMMENDATIONS <br /> IBased upon the results of the First Quarter 2005 investigation, AGE recommends <br /> • Continued quarterly ground water monitoring of wells VW-I (B and C), VW-2A, VW-3A, <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />