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Page 2 <br />February 22, 2000 <br />Assurance Program must be amended to document ~compiiance 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 far 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 m(tigating 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 orig(nai 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 />HBuffer and Screening Plan" shall be developed by ER(r and approved by staff which <br />identifies the foss of significant trees from the inventory and a proposal to mitigate tree Pass <br />to maintain and enhance the screening of the landfi{i and operations. The plan shalt <br />address the preservation of the buffer during construction, throughout the operational period <br />of the landfill and through the final Dover 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 vino me t I eso ces Group, L-LC <br />Matthew I... l.edvina, P.E. <br />Project Manager <br />G:\Clients\Client A-I.iCity of Elk River\t_etters 2000\It000220.doc <br />