Document 2JX4erokQXpZzMQ3Mn4kok2zR

USCA Case #24-1190 Co strip PM Evaluation -- Final Document #2062093 Apri 29, 2024 Filed: 06/27/2024 Page 48 of 92 Cost Evaluation included to connect to all air users, and provide air connections around the perimeter of the top of the new equipment and between the rows of hoppers under the new equipment. The ash handing system is a negative pressure conveying arrangement designed such that the ash from the hoppers will be conveyed in a single conveying line to a new common ash silo. At the ash silo there will be a single filter/separator on top of the silo with an 18" double gate valve. The filter separator will be operated intermittently and will be equipped with a vacuum breaker. Mechanical exhausters (2x100%), with automatic crossover valves, are included. 5.2 OPERATION AND MAINTENANCE, LEVELIZED COSTS The O&M cost estimates for the various control technology options evaluated for Colstrip included in this study are summarized in Table 5-2. Table 5-2: O&M Cost and Levelized Cost Summary Summary of Particulate Emissions Control Costs from Colstrip for Units 3&4 PM Emissions Economic Impacts PM-10 Control Alternative (Ranked by PM-10 Rate) Removal Efficiency % Emission Rate Hourly Emission Annual Emission Emission Reduction Installed Capital Cast Annual 0 &M Cost Total Annual Cost Average Control Cost Reheat ESP Reheat fabric filter 2022 Baseline (Scrubber) 71.45 71.45 lb/MMBtu 0.006 0 006 0.0220 Lbs/Hr 95 95 334 Tons/yr 355 355 1245 Tons/yr 890 890 $1,000 568,722 356,426 N/A $1,000 21,085 14,786 N/A $1000Iyr 88,546 57,065 N/A S/ton 99,536 64,148 N/A 5.2.1 O&M Cost Basis O&M costs for the evaluated systems at Colstrip assuming the following parameters: Power cost of $45/MWh. Operating labor rate of $200,000 for one full time equivalent (FTE). Cost of Money 8.25% Levelization period, 15 years Waste disposal cost, S15/ton Unit 3 and 4 capacity factor of 85.0% Bag replacement every 5 years for the fabric filter. 5% of direct cost for average annual equipment maintenance ** ** Talon Montana 5-8 Sierra Club FOIA 2025-EPA-04883 Bums & McDonnell ED_01 8388_00000309-00048 SC_EVERSPLIT0006211