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02 April 2013 <br /> AGE-NC Project No. 95-0130 <br /> Page 8 of 9 <br /> • MTBE was not detected in any SVE samples during the 4th quarter; MTBE has not <br /> been detected in any SVE samples collected from the site since October 2008. <br /> • Generally, total SVE inlet flow rates averaged 55 cubic feet per minute (Table 2). <br /> • The fourth quarter mass of hydrocarbons extracted by the SVE system was <br /> calculated to be 249 pounds (equivalent to 40 gallons) of petroleum hydrocarbons <br /> (Appendix D; Table 3). <br /> • Total petroleum hydrocarbon SVE extraction rates were estimated to be <br /> approximately 2-4 pounds/day. <br /> • Since initiation of the SVE system in November 2004, the adjusted total mass <br /> extracted of petroleum hydrocarbons is calculated at 24,340 pounds. <br /> The results of GW ET groundwater remediation between September and December 2012 <br /> are as follows: <br /> • Approximately 162,580 gallons of hydrocarbon-impacted groundwater were <br /> extracted from remediation wells EW-1, VW-1C, VW-2A and VW-3A (Table 1). <br /> • Since March 2011, dissolved influent TPH-g concentrations have generally been <br /> detected between 20,000 pg/I and 55,000 pg/I. Furthermore, between the 2nd 3rd <br /> and 4th quarters 2012,the average dissolved influent TPH-g concentrations declined <br /> from 44,000 pg/I to 32,000 pg/I to 29,000 pg/I, respectively. Therefore, an overall <br /> trend of decreasing TPH-g concentrations was observed between the 2nd and 4th <br /> quarters 2012; however BTEX, MTBE and TAME concentrations fluctuated within <br /> normal ranges and no trend was evident. A plot of the influent TPH-g concentrations <br /> versus time is included in Appendix F. <br /> • Since initiation of the GWET system in November 2004, the total volume of <br /> petroleum hydrocarbon-impacted water extracted is approximately 5,096,386 <br /> gallons (Table 4), while the mass of petroleum hydrocarbons removed from the <br /> above total volume is estimated to be 1,252 pounds of dissolved petroleum <br /> hydrocarbons. <br /> • Dissolved total petroleum hydrocarbons were extracted by the GW ET remediation <br /> system at rates between 0.27 and 0.51 pounds/day. <br /> Advanced GeoEnvironmental,Inc. / <br /> v <br />