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Mr. Jim Dunn <br /> Page 2 <br /> August 12, 1996 <br /> Monitoring Requirements: <br /> Monitoring should be conducted quarterly for the first six monitoring events. Thereafter <br /> monitoring should be conducted semi-annually until closure criteria are met(See"Closure <br /> criteria below). Monitoring should include: <br /> a) Measurement of water level and product thickness in all monitoring wells; <br /> b) Analysis of water samples from all monitoring wells for benzene, ethyl benzene, toluene, <br /> xylene,methyl tertiary butyl ether, a�:nd total petroleum hydro carbons usin�gasoline rar�ge <br /> organics and diesel range organics; <br /> c) Semi-annual vapor survey of utilities or structures that have the potential to be impacted by <br /> the release. <br /> Additional Work: <br /> Perform push probe ground water investigation and analysis at water table to show that plume is <br /> stable and not affecting surface water. Analyze ground water for gasoline range organics, diesel <br /> range organics,benzene,toluene, ethyl-benzene,xylene, and methyl tertiary butyl ether. <br /> Re�ortine: <br /> An annual progress report should be prepared arid submitted in accordance MPCA Fact Sheet <br /> #3.26,"Annual Monitoring Report,"April 1996. Results of the quarterly(or semi-annual) ' <br /> monitoring should be included in the annual report. Results of quarterly or semi-annual <br /> monitoring should simply be submitted to MPCA staff in tabulaz format. <br />