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02 May 2013 <br />AGE-NC Project No. 99-0559 <br />Page 5 of 5 <br />Concentrations trends within wells, established in the upper water table, declined <br />considerable since the initiation of active soil vapor extraction; further have <br />considerably declined over the past two years. However, dissolved MTBE and TBA <br />appear to have the potential for off-site migration and dispersion. <br />5.0. RECOMMENDATIONS <br />Based on the conclusions presented in this report, AGE recommends: <br />Continuation of limited groundwater monitoring to reduce project costs. <br />Continuation of active groundwater remediation, when State Water Resources <br />Control Board cost reimbursement has been dedicated and is available for the site. <br />Groundwater extraction has demonstrated to be the most cost-effective technology <br />to remediate the site. <br />6.0. 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. The findings <br />were based upon analytical results provided by an independent laboratory. Evaluation of <br />the hydrogeologic conditions at the site for the purpose of this investigation was made from <br />a limited number of available data points (e.g., groundwater samples) and subsurface <br />conditions may vary away from these data points. No other warranty, expressed or implied, <br />is made as to the professional interpretations, opinions and recommendations contained <br />in this report. <br />Advanced GeoEnvironmental, Inc.