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i <br /> U. S. Army Corps of Engineers <br /> h }" In Situ Air Sparging Subsurface j <br /> Performance Checklist <br /> i <br /> Installation Name <br /> i <br /> Site Name/I D <br /> Evaluation Team <br /> Site Visit Date <br /> This checklist is meant to assist the team in evaluating the overall performance of an in situ air spargmg(ISAS) <br /> system for removing volatile contaminants from groundwater It is divided into the following sections <br /> 1) Evaluation team composition <br /> 2) Typical treatment objectives <br /> 3) References <br /> 4) Data collection requirements <br /> 5) Performance analysis calculations <br /> 6) Adequacy of operations and maintenance <br /> 7) Typical performance problems <br /> 8) Alternatives for possible cost savings <br /> 9) Supplemental notes and data <br /> The checklist provides suggestions for information gathering, and space has been provided to record data and notes <br /> from the site visit Supplementary notes, if required, should be numbered to correspond to the appropriate checklist <br /> sections <br /> 1) Evaluation Team Composition <br /> The following disciplines should be included in the evaluation team for an ISAS system <br /> • Hydrogeologist (site visit, subsurface performance evaluation) <br /> • Process Engineer (site visit,above-ground equipment evaluation) <br /> • Regulatory Specialist (regulatory requirements) <br /> • Cost Engineer (cost of alternatives) <br /> 2) Typical Treatment Objectives <br /> Verify that the treatment objectives established when the air sparging system was designed and installed are clear <br /> and still valid <br /> In situ air sparging systems are typically used to remediate groundwater contamination plumes through volatilization <br /> Of the contaminants to the vadose zone, and to stimulate bioremediation in the saturated zone or in both the vadose <br /> and saturated zones <br /> Clean up goals can include the reduction of contaminant concentrations to below some standard either throughout <br /> the plume or downgradient of a sparging line/trench If bioremediation is desired, the objectives may be to achieve <br /> and sustain an adequate level of oxygen and nutrients in the target zone,with the anticipation that bioremediation <br /> will achieve a specified cleanup level <br /> 06/07/99 <br /> Page 1 of 6 <br />