ARCHIVED REPORTS_QUARTERLY MONITORING AND REMEDIATION REPORT - FIRST QUARTER 2007

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24 April 2007 AGE-NC Project No. 04-1207 Page 9 of 9 5.0. CONCLUSIONS AND RECOMMENDATIONS Based on the findings of the environmental activities recounted in this report,AGE concludes and recommends: • Continuation of quarterly monitoring events; the next event is scheduled to take place in April 2007. • Contoured concentration data from wells MW-1 through MW-5 indicate that the lateral extent of petroleum hydrocarbon contamination in ground water is defined to the north by well MW-4, to the south by well MW-2, to the west by soil boring B2, to the southeast by well MW-3, and to the east by well MW-5. • On 02 April 2007, ground water extraction activities were stopped, as the Baker Tank was full. A ground water sample was collected from the tank for analysis in order to evaluate disposal options. The lack of detectable petroleum hydrocarbon constituents in the influent ground water remediation sample may indicate a successful remediation and ground water remediation may no longer be required. Resumption of ground water extraction will depend upon the rebound of petroleum hydrocarbon constituents in well MW-1.Monthly sampling and weekly start-up sampling of well MW-1 should be conducted for the first month of resumed operations to establish extracted concentrations. • TPH-g concentrations in extracted soil-vapor samples exhibit a steady general decline since initiation of SVE remediation in February 2007, indicating that SVE remediation at the site is effective. 6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based upon analytical results provided by an independent laboratory.Evaluation of the hydrogeologic conditions at the site for the purpose of this investigation was made from a limited number of available data points(i.e.,ground water samples)and subsurface conditions may vary away from these data points. No other warranty,expressed or implied,is made as to the professional interpretations,opinions,and recommendations contained in this report. Advanced GcoEnvironmental,Inc.