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• The data from the AS/SVE test confirmed that a vacuum gradient could be maintained <br /> outside the radius of the spargmg wells if sufficient vacuum/flow was applied at the SVE <br /> locations <br /> • The bioremediation testing indicated that soil aeration efforts could be enhanced with the <br /> addition of nutrients and oxidizing agents to the air stream(s) <br /> Recommendations <br /> Based on these conclusions, AES has the following recommendations for remediation design <br /> parameters at the site <br /> • For design purposes, radial influences of 10 feet for AS and 20 feet for SVE will be utilized <br /> for the system layout In addition, sufficient overlap for aggressive remediation and reduced <br /> duration of operations will be utilized With a 50 percent overlap, a well spacing of <br /> approximately 15 feet for AS and 30 feet for SVE will facilitate aggressive remediation of <br /> the dissolved-phase hydrocarbon concentrations and should create exposure of the source <br /> areas (sorbed-phase) concentrations for remediation via SVE technology <br /> • Since SVE must be included for the remediation of source area hydrocarbons, air sparging <br /> should be operated at the maximum allowable flow rates such that a minor vacuum gradient <br /> . is maintained outside the influence of the AS wells <br /> • Following the maximum effective recovery/removal of the sorbed-phase hydrocarbons from <br /> the source area, then AS flow rates may be lowered to such a level that SVE will not be <br /> required At this milestone, the addition of bioenhancement technologies, such as an ozone <br /> generator, should be considered <br /> III-7 <br />