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I 10 11 January 2006 AGE-NC Project No 95-0130 ' Page 12 of 14 • The high concentrations of petroleum hydrocarbons detected in samples collected from wells ' MW-6(B and C),MW-7(A and B),VW-I C,VW-2A and VW-3A indicated that these wells are within or near the dissolved petroleum hydrocarbon"core area" of the plume (Figures 5 ' through 8) • The lateral and vertical extent of the dissolved petroleum hydrocarbon plume is not known toward the northwest,north,northeast,east and southeast of the area bound by wells MW-1 ' through MW-7 (Figures 5 through 8) ' Based on SVE remediation data collected between 22 June 2005 and 07 September 2005, AGE concludes ' Analytical results of SVE inlet vapor concentrations ranged between 1,700 µg/l and 3,400 µg/1, the average SVE inlet vapor concentration was approximately 2,500 �Lg/l ' A noticeable decline in hydrocarbon vapor concentrations was evident between the second quarter and the third quarter 2005 monitoring events, a plot of the influent TPH-g concentrations versus time is included in Appendix G The average SVE inlet flow rate was approximately 93 cubic feet per minute, the average differential pressure measurements were recorded at 3 10 inches of water (Table 6) ' The volume of hydrocarbons extracted by the SVE system was calculated to be approximately 251 gallons (equivalent to 1,570 pounds) of petroleum hydrocarbons (Appendix I) between the 22 June 2005 and the 07 September 2005 monitoring periods ' (Table 7) • Since initiation of the SVE system in August 2004, the total volume of petroleum ' hydrocarbons extracted is estimated to be approximately 2,591 gallons (Table 7), while the total mass is estimated at approximately 16,198 pounds of extracted petroleum hydrocarbons ' The results of pump and treat ground water remediation between 03 June and 07 September 2005 are as follows ' • On 17 August 2005, continuous ground water extraction activities were initiated at wells VW-1C, VW-2A and VW-3A to augment the on-going P&T remediation system, ground water extraction rates were adjusted at wells VW-I C,VW-2A and VW-3 A to extract ground ' water at an approximate rate of 3/4 gallons per minute • Between 03 June and 07 September 2005, approximately 255,480 gallons of hydrocarbon- impacted ground water were extracted from wells EW-1, EW-2, VW-1C, VW-2A and VW-3A (Table 9) Advanced GeoEnvironmental,Inc