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Page 2 <br /> February 22, 2000 <br /> Assurance Program must be amended to document compliance with the compaction <br /> specification to ensure the stability of the liner system. Compaction testing for subgrade fill <br /> must be conducted on a frequency of one per 10,000 square feet for each foot of soil <br /> placed. <br /> 6. Operation of the Active Gas Control System (AGCS) is currently being conducted by Power <br /> Strategies, Inc. with the goal of optimizing power generation. The AGCS was originally <br /> implemented as a means of mitigating migration of landfill gas and ongoing contamination of <br /> the groundwater in the unlined portion of the landfill. Operation of the AGCS must be <br /> managed by ERL personnel with the original goals of the AGCS system used as the primary <br /> conditions of operation. <br /> 7. ERL shall develop a current AGCS Operation and Monitoring Plan which is based on <br /> operating experience of the system and which takes into consideration the contractual <br /> arrangements with Power Strategies. <br /> 8. The vegetation within the 200 feet buffer area in the southeast, south and southwest areas <br /> of the site shall be maintained. ERL shall develop an inventory of "significant" trees. A <br /> "Buffer and Screening Plan" shall be developed by ERL and approved by staff which <br /> identifies the loss of significant trees from the inventory and a proposal to mitigate tree loss <br /> to maintain and enhance the screening of the landfill and operations. The plan shall <br /> address the preservation of the buffer during construction, throughout the operational period <br /> of the landfill and through the final cover construction. <br /> 9. The proposals for implementing three to one final cover sideslopes and leachate <br /> recirculation are conditionally approved pending MPCA approval. • <br /> Please contact me if you have additional questions or comments. My phone number at ERG is <br /> 612-339-2316. Thank you. <br /> Sincerely, <br /> E viro`me t.I 'eso ces Group, LLC <br /> Matthew L. Ledvina, P.E. <br /> Project Manager <br /> G:\Clients\Client A-L\City of Elk River\Letters 2000\It000220.doc <br /> • <br />