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i 08 April 2005 AGE-NC Project No 95-0173 IPage 9 of 10 ' The volume of hydrocarbons extracted by the SVE system was calculated to be approximately 79 gallons of petroleum hydrocarbons(Appendix G)during the fourth quarter 2004 monitoring period (Table 7) • Since initiation of the SVE system,the total volume of petroleum hydrocarbons extracted is estimated to be approximately 2,093 gallons (Table 7) • A spike in the PID field measurements and influent SVE air samples was evident during the 3rd quarter 2004 monitoring period and coincided with the operation/reconfiguration from IAS well AW-2B to IAS well AW-1 B, however, 4`h quarter 2004 influent SVE air samples Isteadily declined from 1,400 µg/l to 320 µg/1 I5.0. RECOMMENDATIONS Based upon fourth quarter 2004 data collected from the site, AGE recommends • Continued quarterly ground water monitoring and sampling at the site,to reduce unnecessary sampling/analytical costs AGE recommends removal of wells with four consecutive events with no detection of contamination from the sampling program (MW-7, MW-8, MW-10, MW-11, and MW-12) Quarterly ground water sampling of the remaining wells should continue to monitor the progress of the SVE and IAS remediation system • Continued operation of the on-site SVE and IAS remediation system, progress will be evaluated on a quarterly basis • One additional ground water monitoring well is warranted off-site and east of well MW-4 to delineate the downgradient,vertical extent of petroleum-impact AGE is in the process of attempting to contact the appropriate property owners(to the northeast) so that a monitoring well access agreement can be reached To date,AGE has made several unsuccessful attempts to reach the appropriate property owners of the adjacent condominium complex • With the exception of monitoring wells MW-2 and MW-4, SVE/IAS remediation efforts have been effective in reducing petroleum hydrocarbon concentrations to either non detectable levels or near-non detectable levels Based on this success, AGE is proposing to augment the existing SVE/IAS remediation system by installing a total of two (2)additional SVE wells and two(2)additional IAS wells in the areas of MW-2 and MW-4(See Figure 2) IAdvanced GeoEnvironmental,Inc