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3) References This checklist should be coordinated with the Process Instrumentation and Control, Extraction and Monitoring Well, and Environmental Monitoring checklists The following references may also be helpful EM 1110-1-4005 ' In Situ Air Sparging EPA 600/R-961041 Diagnostic Evaluation of In-Situ SVE-Based System Performance 4)Data Collection Requirements The following information should be routinely collected to evaluate the performance of an in situ air sparging system Record the appropriate units with each value a) Describe the objectives for the ISAS system If current objectives are poorly defined or not defined at all, describe what might be reasonable objectives given information from the owner and regulator (e g reduce groundwater contaminant concentrations, biodegradation) b) What is the estimated future operation or remediation time? What is the basis for this estimatc9 c) Obtain representative operating data as follows • Air Distribution Obtain air flow and air pressure data for each sparging well These parameters should be monitored with the same frequency as the monitoring points and should be re-measured when operational changes are made • Chemical Monitoring Refer to the Environmental Monitoring checklist Groundwater sampling and analysis should be conducted at each monitoring point for dissolved oxygen and the contaminants of concern Monitoring should focus on early identification of plume diversion due to displacement of water by air in the sparging areas • Well Performance Refer to the Extraction and Monitoring Wells checklist for physical maintenance issues Note that pulsing of sparging wells can enhance infiltration of silt Sound the depth of the sparging wells on a regular basis d) Record the nameplate information from the blower, pumps, and other mechanical equipment far future reference e) Sketch a process flow diagram(FFD), including valves and instrument locations, on the back of this sheet or on a separate sheet f) If modeling was performed, obtain a copy of the ongmal ISAS modeling done as part of the system design (The design modeling may be useful in evaluating the operation of the system Modeling is not typically done for air spa,g,ng) g) Are appropriate parameters measured that adequately describe the airflow paths9 (e g , neutron probe response, nme-domain reflectometry, electrical resistivity tomography dissolved oxygen concentrations, air bubbling, air pressure measurements) 06/07/99 Page 2 of 6