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15 December 2003 <br /> AGE-NC Project No 98-0448 <br />' Page 8 of 9 - <br /> MW-2, and for the first time since sampling began TPH-gBTEX were not detected above <br />' laboratory reporting limits in the ground water sample collected from MW-4A The <br /> decreasing concentrations may be attnbuted to air sparging activities conducted at MW4B _ <br /> } and AW-1 through AW-4 Additionally, downgradient well MW-6 has not detected any <br /> t petroleum hydrocarbon constituents of concern for five successive quarters <br />' Based on SVE/TAS remediation data collected between 23 June 2003 and 09 October 2003, AGE <br /> concludes <br />' • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> a approximately 22 10 pounds, or equivalent,to an approximate volume of 3 53 gallons of <br /> gasoline extracted (Appendix F) I - j <br />' a The average SVE inlet flow rate was estimated to be 33 cubic feet per minute cfm at an <br /> g p � ) <br /> average differential pressure of 0 37 inches of water(Table 6) <br /> • Since Initiation of the SVE system(April 2001),the total volume of petroleum hydrocarbons <br /> extracted is estimated to be approximately 239 gallons (Table 7) <br />' 6.0. RECOMMENDATIONS <br /> Based upon the results of this Investigation, AGE recommends <br /> r Continued quarterly ground water monitoring and sampling of wells MW-1, MW-2, <br /> MW-4A, MW-4B and MW-6, ground water sampling 'results will be used to monitor <br /> ,progress of the SVE and IAS remediation system <br /> • Continued operation of the on-site SVE and IAS remediation system,however,to optimize <br /> the effective radius of Influence;in the `core' area of the plume, AGE recommends only <br /> w applying vacuum to wells VW-1, VW-2 and MW-4A Remediation progress will be re-, <br /> evaluated on a quarterly-basis r _ _ _ _ _ _4, <br /> • On 17 June 2003, AGE installed air-flow pressure regulators at the well-heads of AW-1 <br /> through AW-4 and MW-4B, which will allow independent control of air-flow to each IAS' <br /> well, and allow continuous air sparging from all IAS wells in the IAS network Therefore, <br /> AGE recommends continuous air sparging' from IAS wells AW-1 through AW-4 and <br /> MW-4B <br /> ' 1 A <br /> 'Advanced GeoEnvironmental,Inc <br /> 5 n <br />