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' 19 January 2004 AGE-NC Project No 95-0173 Page 9 of 10 ' Previous and current laboratory results of groundwater samples suggest that there is a minor 1,2-DCA impact to ground water In the areas of wells MW-2 through MW-4 and AW-2 (A and B, Tables 3 and 4) Based on SVE remediation data collected between 22 June and 23 Sep tember 2004 AGE concludes ' • The average SVE inlet vapor concentration was approximately 768 gg/l, the average SVE inlet flow rate was approximately 73 cubic feet per minute (Table 6) ' • The volume of hydrocarbons extracted by the SVE system was calculated to be approximately 76 gallons of petroleum hydrocarbons(Appendix G) during the third quarter 2004 monitoring period (Table 7) ' • Since initiation of the SVE system,the total volume of petroleum hydrocarbons extracted Is estimated to be approximately 2,014 gallons (Table 7) • A spike in the PID field measurements and influent SVE air samples was evident during the third quarter 2004 monitoring period and coincided with the operation/reconfiguration from lie IAS well AW-2B to IAS well AW-1B 50. RECOMMENDATIONS Based upon third quarter 2004 data collected from the site, AGE recommends • Continued quarterly ground water monitoring and sampling at the site,to reduce unnecessary sampling/analyticaI 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 • rlYie nrliji lnnal b ninrul :;rater mvnitviing �r,ell , 40.4 riff 4 .l + F 11 Tef�17 A .41A ;j Ywrar.an+e Vi;'VILe L4.i1LL LUJL Vl YY V1A 1Yl YY-T 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 Advanced GeoEnvironmental,Inc