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Former Canteen Facility January 13,2005 <br /> Quarterly Groundwater Monitoring Report _ Page 6 <br /> SYSTEM OPERATING EFFICIENCY <br /> I During this quarter, the system was shutdown only for oil changes of the ICE unit The total <br /> down time has been estimated at approximately seven (7) hours As projected during the <br /> previous report, various lessons had been learned regarding the operation of the ICE unit and <br /> future operations were expected to have an uptime in excess of 95% The uptime for this quarter <br /> is 99.7%. Thus, the overall uptime since system start-up has improved from approximately 84% <br /> to 89% <br /> IRECOMMENDATIONS <br /> IDelta recommends the following for the Former Canteen Facility <br /> • Continue groundwater monitoring and reporting, including measurement of depth to <br /> groundwater in each well, evaluating monitor well status, preparation of a <br /> potentiometnc surface contour map containing the calculated gradient and <br /> approximate rate of groundwater movement, and, preparation of isoconcentration <br /> contour maps for benzene and TPH(g) at the two different screened aquifer depths. <br /> • The schedule for groundwater monitoring will remain as follows <br /> IQuarterly Monitoring Annual Monitoring <br /> (154, 2nd, and 3rd Quarters) (4t1' Quarter) <br /> I <br /> MW-3, MW-3A, MW-313, MW-I 1 All Wells <br /> MW-13, MW-13A, MW-13B <br /> Each well will be gauged quarterly If an analyte is not detected by the laboratory for <br /> I two consecutive quarters, then that analyte will only be monitored for during the <br /> annual event Delta understands that should a removed analyte be detected in a <br /> monitor well during annual monitoring, quarterly monitoring and analysis will resume <br /> I for that well Groundwater monitoring will be performed during the second month of <br /> each quarter and quarterly momtornnf reports will be submitted to the appropriate <br /> County and State agencies by the 154 of the first month following the end of each <br /> quarter <br /> • Continue operation of the soil and groundwater remediation system and conduct <br /> weekly operation and maintenance activities Influent and effluent air samples will be <br /> collected periodically for laboratory analysis to assess the extraction and treatment <br /> efficiency of the remediation system The remediation system operation and <br /> Imaintenance activities and sampling results will be reported in the Quarterly <br /> • Groundwater Monitoring Reports <br /> I <br /> I <br />