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Conditional Use Permit and Solid Waste Facility <br />Narrative <br />Operations Control Emergency Generator is included in ERS Title V air permit but is <br />maintained and operated by system operations. The Elk River Peaking Station is also <br />included in the MPCA issued Title V air permit #14100003 as an emission source on this <br />site. <br />Water usage and discharge: <br />System cooling is provided by once-through appropriations from the Mississippi River. <br />Discharge and monitoring to the Mississippi is governed by the,Minnesota Pollution <br />Control Agency under the National Pollution Discharge Elimination System (NPDES) <br />permitting program. Additional groundwater appropriations are used for scrubber <br />operation and internal wastewater streams. Treatment is provided by a wastewater <br />clarifier which discharges internally to the once-through cooling water discharge. <br />Combustor waste (ash): <br />Fly ash produced in the course of waste combustion is stored in an enclosed area at the <br />facility. A fabric filter baghouse controls PM emissions during the conveyance of the fly <br />ash. The ash is shipped from the site using covered trucks to a permitted ash-only cell in <br />Becker, MN. <br />Large on-site tanks: <br />The ERS facility has three bulk fuel oil tanks. Until recently, these tanks were empty .and <br />unused since 1981. As part of the construction of the peaking station, two of the tanks <br />were refurbished; one is used for fuel oil storage and the other is used for demineralized <br />water storage. The third tank remains sealed off and unused. The refurbished fuel oil <br />tank supplies backup fuel to ERS and the peaking station. The demineralized water is <br />used to control NOx emissions when the peaking station combustion turbine is firing fuel <br />oil. <br />S:\Legal\Environmental\ERS\City of Elk River\Templates\ER CUP Renewal Narrative.docx <br />Page 3 of 3 <br />