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f <br />z <br />C <br />� I n <br />between '30 and 45 days of the pump and treat operationwill be required. <br />Proposed Groundwater Cleanup Levels <br />Benzene to less than 5 ug/L TPHg to less than0 mg/L <br />MTBE to less than 1 ug/L i. <br />Summary <br />The only groundwater remediation system that will meet the requirements to remove MTBE is an <br />Activated Carbon Filter system. Activated Carbon filtration was successful to non detect levels for all <br />organic compounds during the ATC pump test. <br />A total recharge replacement of -the groundwater in the c ritaminated aquifer is about 507,000 gallons_ <br />At a 12 gpm pumping and filter rate, 29 days would be required to remove the contaminated groundwater <br />at 1.00% efficiency. The last monitoring event indicated that only MWO is contaminated with MTBE <br />and only GMX-1 is contaminated with Benzene. Mv&4 was not contaminated. If qualitites and <br />assumptions hold as estimated, the project should be cotppleted in 30 to 45 days. <br />Please approve this work plan at your earliest conveni, <br />timely manner. If you have any questions on the work pli <br />Respectfully submitted, <br />4 <br />[ce, so that the work make be completed in d <br />please call Ervin Rifenburg at 2091368-9381. <br />