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IFormer Canteen Facility July 1,2004 Quarterly Groundwater Monitonng Report Pa e 6 IDuring this quarter, the system was shutdown for repairs and maintenance on the following dates Date Off Date on Time Off Actions Taken 5/1/04 512104 31 hours Out of propane 5118104 5120104 48 hours Replace sark lu s I6/14/04 6/30/04 16 days New plug wires, and new engine heads RECOMMENDATIONS IAES recommends the following for the Former Canteen Facility • Continue groundwater monitoring and reporting, including measurement of depth to groundwater in each well, evaluating monitor well status, preparation of a potentiometric surface contour map containing the calculated gradient and approximate rate of groundwater movement, and, preparation of isoconcentration contour maps for benzene and TPH(g) at the two different screened aquifer depths • The schedule for groundwater monitoring is as follows Quarterly Monitoring Annual MonitorinIZ I (15`, 2nd, and 3rd Quarters) (4'h Quarter) MW-3, MW-3A, MW-31), MW-I I All Wells MW-13, MW-13A, MW-13B Each well will be gauged quarterly If an analyte is not detected by the laboratory for two consecutive quarters, then that analyte will only be monitored for during the annual event AES understands that should a removed analyte be detected in a monitor well during annual monitoring, quarterly monitoring and analysis will I resume for that well Groundwater monitoring will be performed during the second month of each quarter and quarterly monitoring reports will be submitted to the appropriate County and State agencies by the 15`h of the first month following the end of each quarter • Continue operation of the soil and groundwater remediation system and conduct I weekly operation and maintenance activities Influent and effluent air samples will be collected periodically for laboratory analysis to assess the extraction and treatment efficiency of the remediation system The remediation system operation and I