GVEA Golden Valley Electric Association liL)\ - 12 i 1), \k 1.0- 0-1-12 go) (91r) I-32-115!

MEMO Rae Cronmiller June 16, 2023 Pate 5 As noted above, PS 11 specifies acceptable criteria for a correlation directly related to the applicable emissions limit.

11&S Rule Presidential Exemption Request March 31. 2025 Page 2 of 10 A.

DECLARATION OF CHRISTOPHER 'MEYERS, P.E.

exposure due to an environmental release incident.

United States Steel March 31, 2025 Hon.

r TALEN ell MONTANA conducted a mist eliminator performance test, and the results showed dry conditions with very little or any droplet carry over.

USCA Case #24-1190 Document #2062093 Filed: 06/27/2024 Page 18 of 92 if granted a one-year deadline extension under the rule.

USCA Case #24-1190 Document #2062093 Filed: 06/27/2024 CONFIDENTIAL Page 28 of 92 Co'strip Particulate Matter Control Cost Evaluation - Final prepared for Talen Montana Colstrip, Montana April 2024 Project No. 163860 prepared by Burns & McDonnell Sierra Club FOIA 2025-EPA-04883 ED_018388_00000309-00028 SC_EVERSPLIT0006191

Minnkota Power Cooperative, Inc Milton R Young Station Unt 1 and 2 A14559 013 Rev 2 May 22, 2024 Storage duration: Approximately 18 days based on silo capacity of 105,000 lbs and total combined PAC consumption rate of 244 lb/hr (MRY Unit 1 at 86 lb/hr and MRY Unit 2 at 158 lb/hr) MRY Unit 1 (257 MWg) Fuel Additive: ARQ (formerly ADA) M -Prove s Average M-Prove application rate: 6.0 ppm s Maximum M-Prove dosage pump rate: 18.0 ppm Non-brominated PAC Injection: s Maximum Train A PAC injection at 100% feeder rate: 1 43 lb/min (approximately 86 lb/hr or 1.06 lb/MMacf) s Transport piping limited to 192 lb/hr (2.37 lb/MMacf) to avoid pluggage issues s PAC injected into flue gas using eight (8) lances located across the APH outlet duct. s The lance depths vary from 18" -- 54" to provide even distribution of PAC into the flue gas stream MRY Unit 2 (470 MWg) Fuel Additive: ARQ (formerly ADA) M -Prove s Average M-Prove application rate: 8.0 ppm s Maximum M-Prove dosage pump rate: 18.0 ppm Non-brominated PAC Injection: s Maximum Train B and C PAC injection at 100% feeder rate: 2 64 lb/min (approximately 158 Ibihr or 1.12 lb/MMacf) s PAC injected into flue gas using eight (8) lances located across each of the North and South APH outlet ducts for a total of sixteen (16) lances. s The lance depths vary from 15" - 78" to provide even distribution of PAC into the flue gas stream Mercury Testing Results for the MATS Residual Risk and Technology Review Sierra Club FOIA 2025-EPA-04883 2 Si --gr -vt & Lulu/ay ED_018388_00000327-00016 SC_EVERSPLIT0006325

Minnkota Power Cooperative, Inc Milton R Young Station Unt 1 and 2 A14559 013 Rev 2 May 22, 2024 Table 2-4 -- Forecasted 2025 -- 2036 Center Mine Ultimate Coal Analyses (As-Received) Fuel Parameter Mercury Content Higher Heating Value (HHV) Estimated Hg Emission Units ppm Btu/lb Ilp/TBtu ' Average 0.091 6,625 8.41 Minimum Maximum 0.053 0.184 6,489 6,739 4.79 17 42 Industry experience has shown that lignite coal deposits vary significantly in quality, including fuel combustion performance, mineral content, and Hg content, resulting in a coal that can change on a day-to-day basis depending on the coal seam being mined at the time This variability was demonstrated by the range of coal analyses from MRY Unit 1 recent short-term testing in 2024 (average = 10.1 lb/TBtu, with individual results ranging from 4.9 - 18.6 lb/TBtu over the course of five (5) days of testing),Individual coal samples and how they varied across coal feeders, per day are shown in following table.

Minnkota Power Cooperative, Inc.

Coast.

OTOMQ-ZEikEttttily- 2024-EPA-05254 Sierra Club FOIA 2024-EPA-05254 ED_017426_00000896-00001 SC_EVERSPLIT0000678

Appointment From: Sent: To: Subject: Location: Gunasekara, Mandy [/O=EXCHANGELABS/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=F639EA28AF4C455493939E3129260707-GUNASEKARA,] 3/24/2020 6:46:55 PM Bill Koetzle [KoetzleB@api.org] Declined: Call with Troy, Ross, Rachel, and Derrick Skype Start: 3/25/2020 8:00:00 PM End: 3/25/2020 9:00:00 PM Show Time As: Busy 2024-EPA-05254 Sierra Club FOIA 2024-EPA-05254 ED_017426_00003105-00001 SC_EVERSPLIT0002304