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N 28 October 2011 AGE-NC Project No, 99-0682 Page 4 of 4 3.0 . CONCLUSIONS Based on SVE vapor remediation data collected during the third quarter 2011 operational period , AGE concludes the SVE system appears to be moderately effective at extracting hydrocarbons from the subsurface. Overall , SVE operations were effective at removing a substantial portion of the adsorbed hydrocarbon constituents in the vadose zone . To date an estimated 10 , 021 pounds or 1 , 633 gallons of hydrocarbons as gasoline were extracted by the SVE system . Based on periodicsite monitoring , a strong declining trend in influentTPH-g concentrations since the September startup has been observed ; justifying the installation catalytic oxidation cell , as shown in Appendix D . Furthermore , the SVE system appears to have reached a point of diminishing returns from the current well network as the SVE system is removing subsurface hydrocarbon vapors at rates ranging from 1 . 73 to 1 . 91 pounds per day (Appendix E ) . 4.0 , RECOMMENDATIONS As of 22 August 2011 , the SVE system has been temporarily shut down for the performance of a SVE rebound test. On 19 October 2011 the SVE system was restarted for a period of 24-hours and soil vapor samples were collected on 20 October 2011 to evaluate influent soil vapor concentrations . Upon receipt of SVE rebound analytical data , AGE recommends preparation of a report of findings evaluating future vadose zone remediation at the site . 5.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities . Findingswere based mainly upon analytical results provided by an independent laboratory. Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (soil vapor samples) , and subsurface conditions may varyawayfrom these data points . No other warranty, expressed or implied , is made as to the professional interpretations , opinions and recommendations contained in this report. Advanced CeoEnvironmental, Inc.