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<br />OCT-04-94 TUE 09:58 AM UNITED POWER ASSOCIATION 612 2~12~54 <br /> <br />P.02 <br /> <br />. <br /> <br />United Power Association - Elk River Station <br />Notification of Exceed.nce <br />MPCA Permit No. 147A4600T.1 <br /> <br /> Average <br /> Time Emission Corrective Unit <br />Date Period Unit Emission Rate Cause Action Status <br />29-Sep-Q4 0800-1400 Boiler 1 CO 433 See Below See Below 10.7 <br />29-Sep-Q4 0800-1400 Boiler 2 CO 426 See Below See Below 10.7 <br /> <br />U nit Status: <br /> <br />This is the average load in gross megawatts for the duration of the exceedance. <br />It only includes time the units are on line and burning RDF. <br /> <br />Cause: <br /> <br />During a capability test on the plant the Cleaning system in the fabric filter <br />failed to adequately clean the bags resulting in a flow restriction in this system. <br />This restriction limited the amount of combustion air available to the boilers <br />resulting in an increase in the generation of CO in the combustion process. <br /> <br />.C . - <br />errectlve Action: <br /> <br />The operators adjusted air and fuel flows and burned natural gas in an allempt to <br />get the CO below the 400 ppm limit. When the problem could not be corrected with <br />these operational adjustments these units were taken off RDF fuel and run at minimum <br />load on gas only. Air infiltration from leaks in the ductwork is believed to be a <br />contributing factor to the high fabric filter pressure drop during high load operation. <br />The ductwork will be inspected and repaired as necessary during the next <br />scheduled plant outage. <br /> <br />. <br />