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12 July 2012 <br />AGE-NC Project No. 02-0926 <br />Page 7 of 7 <br />A total of three influent and four effluent vapor samples were collected during the <br />i 60-day IAS pilot test. TPH-g and BTEX constituents were detected in all three <br />influent vapor samples and from one of the effluent samples due to carbon <br />breakthrough. Based on laboratory analytical data, influent vapor stream <br />concentrations significantly increased when compared to results from the 72-hour <br />pilot test. The increase in concentrations can be attributed to use of MW-5 as a <br />vapor recovery well. An additional .vappr recovery well would be warranted in the <br />vicinity of MW-5 should full scale implementation of IAS commence at the site. <br />. Based on vapor samples collected during testing period, a significant hydrocarbon <br />mass was removed (1,045.7 pounds/167.4 gallons) as a result of pilot sparging and <br />vapor extraction performed near well MW-5 (Appendix E). <br />6.0. RECOMMENDATIONS <br />AGE recommends preparation of a correction action plan (CAP) further evaluating the <br />feasibility of ground water remedial technologies for the site, based on the findings from <br />the extended 60-day air sparging test, coupled with results from the initial 72-hour pilot test. <br />A final remediation plan will be included in the proposed CAP and will detail procedures for <br />the installation of additional remedial wells and a permanent remedial system at the site. <br />7.0. LIMITATIONS <br />Our professional services were performed using that degree of care and skill ordinarily <br />exercised by environmental consultants practicing in this or similar localities. Findings were <br />based upon analytical results provided by an independent laboratory. Evaluation of the <br />geologic/hydrogeologic conditions at the site for the purpose of this investigation was made <br />from a limited number of available data points (soil vapor samples, observation wells) and <br />subsurface conditions may vary away from these data points. No other warranty, <br />expressed or implied, is made as to the professional interpretations, opinions and <br />recommendations contained in this report. <br />Advanced GeoEnvironmental, Inc.