5.2. SR 10-19-2009 - Laserfiche WebLink

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Conditional Use Permit and Solid Waste Facility Narrative L.~e on-~ite_tan s. The ERS facility has three bulk fuel oil tanks. Until recently, these tanks were empty and unused since ~ 9~~ , As part of the construction of the peaking station, two of the tanks were refurbished; one is used for fuel oil storage and the other is used for demineralized water storage. The third tank remains sealed vtf and unused. The refurbished fuel oil tank supplies backup fuel to ERS and the peaking station, The demineralized water is used to control NOx emissions when the peaking station combustion turbine is firing fuel oil, 3. Requested ~4rnendments 3.1. Alterr~ to Fuel escr~i ion Scope GRE requests approval to cofire alternate fuels at Elk River station with RDF. The alternate fuels will be limited to TDF, wood and waste wood, A single alternate fuel may be cofired with the RDF or a combination of the alternate fuels maybe cofired with the RDF. None ofthe proposed alternate fuels would be fired without concurrently firing RDF, The ERS will remain primarily a RDF~fired waste-to~energy facility. However, the economics of the overall operations waste processing and waste combustion} are negatively impacted by an overall Iow supply of municipal solid waste to feed the RDF production plant or by short term interruptions in the municipal solid waste supply or RDF supply. cofiring alternate fuels is being proposed as a potential opportunity to maintain the overall economic viability of operating the waste to energy plant. Any economic advantages of cofiring will be dependent an the actual cyst of any alternate fuels and the impact of the alternate fuel on operating and maintenance costs, GRE has begun to investigate fuel supply costs, but we cannot identity actual operating and maintenance cost impacts without actually cofiring the materials over a period at time. Our initial analyses suggest that the requested opportunity fuels after same promise for cost savings, The air emissions permit issued for the Elk River campus currently allows ERS to cofire TDF at a rate at "less than or equal to ~ DD tonslday using ~a] 30-day rolling average" but also "less than ar equal to 2DD tonslday using [a~ 24~hour block." It the City feels it is necessary to also restrict the amount of TDF that is cofired, we request that these same restrictions be used in the CUP, The air emissions permit does not explicitly allow for ERS to burn any wood, However, the air permit, in conjunction with Elk River Station's Industrial Solid Vllaste Management Plan does allow ERS to burn "Excess wood chips from county projects," GRE will have to obtain approval from the MPCA prior to cofiring any wood that is not currently authorized by the permit and Industrial Solid waste Management Plan. S.lLegallEnvironmer~tallERSlAirlCity of ER - Cand.UsePermit1~~09 Alt Fuels AmendmentlER CUP Amend Narrative v~.dac Page 3 of 4