Item 1: Edits to Select Appendix S Class I Air Dispersion Modeling Report text

Transcription

1 2016 Class I Errata Poly Met Mining, Inc. NorthMet Project December 23, 2016 The following provides revisions and corrections to the Class I air dispersion modeling submitted with the permit application in August While evaluating potential refinements, an error in the elevations modeled for the space heating was identified, and an error in emission inputs for one space heating source. Model updating entailed minor tweaks to the Space Heat versus Tailings Basin construction fleet emissions limits during overlapping operations to maintain compliant impacts. To the extent corrections or clarifications to the Class I report text are needed they are provided below. Item 1: Edits to Select Appendix S Class I Air Dispersion Modeling Report text The text on Section S2.1 page 8 of the Class I Air Dispersion Modeling report is edited to read: The modeled configurations are displayed in Table S2-2. As represented below, 50%60% space heating represents 50%60% of the design capacity. The design capacity is the rating needed to adequately heat the facility when outdoor ambient temperatures reach as low as -4140F. At half60% the design load, the equivalent minimum outdoor temperature would be 2-7F, well below the minimum temperatures expected in September. The 25% heating factor would represent a minimum design temperature of 31F which is within the expected range of September temperatures. The truck fleet limitations associated with these heating combinations allow for flexibility of operations. Item 2: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Table S2-2 of the Class I Air Dispersion Modeling report (page 9) is edited to read: aq5-35

2 Table S2-2 AQRV Emission Operating Configuration Assumptions Configuration Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec AQRV Configuration 1 AQRV Configuration 2 AQRV Configuration 3 Space Heating 100% 100% 100% 100% 100% 100% TB Trucks 100% 100% 100% 100% 100% Space Heating 100% 100% 100% 100% 100% 100% TB Trucks 100% 100% 100% 100% 100% Space Heating 100% 50% 78% 91% 0% 25% 94% 100% 100% 100% 100% 14% 30% 0% 100% 100% 100% 100% 100% 100% 100% 100% 60% 70% 100% 100% TB Trucks 100% 100% 100% 100% 100% 86% 22% 37% 39%

3 Item 3: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Table S4-3 of the Class I Air Dispersion Modeling report (page 19) is edited to read: Table S4-3 Class I Area Screening Analysis Results for Potential Terrestrial Impacts All AQRV Configurations Maximum Location (1) Pollutant Background Data (2) Model Air Concentration or Calculated Project- Related Deposition (3) Total Concentration or Deposition Green Line Value or Deposition Analysis Threshold (4) (5) BWCAW Ely Ann. avg. SO 2 (µg/m 3 ) 3-hour max. SO 2 (µg/m 3 ) Total Sulfur (kg/ha/yr) Total Nitrogen (kg/ha/yr) µg/m µg/m 3 kg/ha/yr S kg/ha/yr N Isle Royale National Park Ann. avg. SO 2 (µg/m 3 ) 3-hour max. SO 2 (µg/m 3 ) Total Sulfur (kg/ha/yr) Total Nitrogen (kg/ha/yr) µg/m µg/m 3 kg/ha/yr S kg/ha/yr N Rainbow Lake Wilderness Ann. avg. SO 2 (µg/m 3 ) 3-hour max. SO 2 (µg/m 3 ) Total Sulfur (kg/ha/yr) Total Nitrogen (kg/ha/yr) µg/m µg/m 3 kg/ha/yr S kg/ha/yr N Voyageurs National Park Ann. avg. SO 2 (µg/m 3 ) 3-hour max. SO 2 (µg/m 3 ) Total Sulfur (kg/ha/yr) Total Nitrogen (kg/ha/yr) µg/m µg/m 3 kg/ha/yr S kg/ha/yr N (1) Highest modeled air concentration in each Class I area. (2) Mean annual SO2 concentrations (µg/m 3 ): Annual average SO2 (µg/m 3 ) concentrations calculated from data ( ) in Table 1 of Reference (9)): BWCAW: data from Ely, MN site applied to BWCAW Isle Royale National Park: data from the site in Finland, Minnesota, applied to Isle Royale National Park. Rainbow Lake Wilderness: data from the site in Sandstone, Minnesota, applied to Rainbow Lake Wilderness. Voyageurs National Park: data from Annual Data Summary, Voyageurs National Park 2002, National Park Service, Gaseous Air Pollutant Monitoring Network, Report No. NPS D-139. Highest 3-hour SO2 set equal to annual average SO2 x 9.0, in accordance with USEPA Guideline (Reference (10)). Annual wet deposition data from NAPD data base ( BWCAW: data for Hovland Site, Cook County, MN ( ) Isle Royale National Park: data for Fernberg Site, Lake County, Minnesota ( ) Rainbow Lake Wilderness: data for Spooner Site, Washburn County, Wisconsin ( ) Voyageurs National Park: data for Voyageurs National Park, Sullivan Bay, St. Louis County, Minnesota ( ) Annual dry deposition data from CASTnet database ( for Voyageurs National Park. ( ) (3) Model estimated ambient air concentrations using the CALPUFF modeling system. (4) Green line concentration from (Reference (9)). Deposition Analysis Threshold (DAT) is based on FLM Guidance for the Eastern U.S. (5) S = sulfur; N = nitrogen.

4 Item 4: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Table S4-4 of the Class I Air Dispersion Modeling report (page 19) is edited to read:

5 Table S4-4 Screening Analysis Results for Potential Aquatic Effects All AQRV Configurations Maximum Location (1) Pollutant (2) Background Deposition (3) (kg/ha/yr) Estimated Project-Related Deposition (kg/ha/yr) Total Deposition (Project + Background) (kg/ha/yr) Deposition Analysis Threshold (4) (kg/ha/yr) BWCAW Ely Total Sulfur Total N Isle Royale National Park Total Sulfur Total N Rainbow Lake Wilderness Total Sulfur Total N Voyageurs National Park Total Sulfur Total N (1) Highest modeled deposition used in the assessment. (2) S = Sulfur; N = Nitrogen. (3) Annual wet deposition data from NAPD data base ( BWCAW: data for Hovland Site, Cook County, Minnesota ( ) Isle Royale National Park: data for Fernberg Site, Lake County, Minnesota ( ) Rainbow Lake Wilderness: data for Spooner Site, Washburn County, Wisconsin ( ) Voyageurs National Park: data for Voyageurs National Park, Sullivan Bay, St. Louis County, Minnesota ( ) Annual dry deposition data from CASTnet database ( for Voyageurs National Park. ( ) (4) Deposition Analysis Thresholds based on FLM guidance for the eastern U.S.

6 Item 5: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Tables S5-3 and S5-4, with the addition of Table S5-5 to the Class I Air Dispersion Modeling report (pages 26-27) are edited to read: Table S5-3 Modeled Visibility Impacts Configuration 1 September and October Full Space Heating Limited September (9178%) and October (3014%) TB Construction Fleet Natural Background FLAG 2010 Method 8 (monthly RH, 20% best days background) BWCAW Maximum b ext (%) ,896 8th highest b ext (%) Days with b ext 5% Voyageurs Maximum b ext (%) th highest b ext (%) Days with b ext 5% Isle Royale Maximum b ext (%) th highest b ext (%) Days with b ext 5% 0 0 0

7 Table S5-4 Modeled Visibility Impacts Configuration 2 September 25% Space Heating No September and October Space Heating Partial September (94%) and October (3937%) TB Construction Fleet BWCAW Natural Background FLAG 2010 Method 8 (monthly RH, 20% best days background) Maximum b ext (%) th highest b ext (%) Days with b ext 5% Voyageurs Maximum b ext (%) th highest b ext (%) Days with b ext 5% Isle Royale Maximum b ext (%) th highest b ext (%) Days with b ext 5% 0 0 0

8 Table S5-5 Modeled Visibility Impacts Configuration 3 Limited September (60%) and October (70%) Space Heating Partial September (86%) and October (22%) TB Construction Fleet BWCAW Natural Background FLAG 2010 Method 8 (monthly RH, 20% best days background) Maximum b ext (%) th highest b ext (%) Days with b ext 5% Voyageurs Maximum b ext (%) th highest b ext (%) Days with b ext 5% Isle Royale Maximum b ext (%) th highest b ext (%) Days with b ext 5% Item 6: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Table S6-1 (page 30) is edited to read:

9 Table S6-1 Maximum Modeled Pollutant Concentrations from the Project Compared to Class I PSD Increments Pollutant Averaging Period PSD Class I Increment (µg/m3) USEPA SIL (µg/m3) BWCAW (µg/m3) Voyageurs National Park (µg/m3) Modeled Results Isle Royale National Park (µg/m3) Rainbow Lake Area Wilderness (µg/m3) SO 2 3-Hour Hour Annual NO 2 Annual PM Hour Annual The maximum-modeled concentration from meteorological data is presented.

10 Item 7: Edits to Select Appendix S Class I Air Dispersion Modeling Report table Table S6-4 (page 33) is edited to read: Table S6-4 Cumulative 24-hour PM10 Increment Modeling Summary Pollutant Averaging Period PSD Class I Increment (µg/m3) BWCAW (µg/m3) Modeled Results Voyageurs National Park (µg/m3) PM hour Item 8: Edits to Select Appendix S Class I Air Dispersion Modeling Report figure Large Figure S-2 is updated with revised increment values. See Attachment 1. Item 9: Edits to Select Appendix S Class I Air Dispersion Modeling Report Attachment Appendix S, Attachment C1 is updated with revised values. See Attachment 2.

11 Large Figure S-2. PM 10 Increment Modeling Results ERRATA SHEET ATTACHMENT Class I Errata Poly Met Mining, Inc. NorthMet Project December 23, 2016

12 Barr Footer: ArcGIS 10.4, :51 File: I:\Client\PolyMet_Mining\Work_Orders\Permitting\Air_Permit_Application\Users\ajs\Errata_Large Figure S2 PM10 Increment Modeling Results_22DEC2016.mxd User: ajs K o o c h i c h i n g C o u n t y I t a s c a C o u n t y S t. L o u i s C o u n t y L a k e C o u n t y C o o k C o u n t y L a k e S u p e r i o r PM hr Cumulative Increment (µg/m 3 ) Mine Site Ambient Air Boundary Plant Site Ambient Air Boundary MnDNR Mine Featues, 2015 I PM 10 INCREMENT MODELING RESULTS NorthMet Project Poly Met Mining Inc Kilometers Large Figure S2 Class I Area Air Dispersion Modeling

13 ERRATA SHEET ATTACHMENT Class I Errata Poly Met Mining, Inc. NorthMet Project December 23, 2016 Appendix S Class I Air Dispersion Modeling Attachment C (p 1-2)

14 PolyMet Hoyt Lakes, Minnesota Stack ID No. Permit ID No. Emission Rates Speciated Modeling Rates UTM: Zone 15 (NAD83) LCC: 47N 93W (30,60N) Base Inside Exit Flow Exit NOx PM10 PM2.5 SO2 SO4 PMC PMF SOA EC SO2 SO4 NOX Exit Flow Rate Exit Height from Base Easting Northing X Y Elevation Diameter Velocity Temperature Hourly Annual Hourly Annual Hourly Annual Hourly Annual Hourly Annual (m) (m) (m) (m) (m) (acfm) Note (ft) (m) Basis (ft) (m) (m/s) (F) (K) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) (g/s) Notes SV 003 SV , SV 004 SV , SV 401 SV , SV 005 SV , SV 402 SV , SV 403 SV , SV 404 SV , SV 008 SV , SV 009 SV , SV 405 SV , SV 406 SV , SV 407 SV , SV 014 SV , SV 408 SV , SV 016 SV , SV 502 SV , SV 503 SV , SV 504 SV , SV 505 SV , SV 506 SV , SV 507 SV , SV 508 SV , SV 509 SV , SV 421 SV , SV 422 SV , SV 423 SV , SV 424 SV , SV 409 SV , SV 2532 SV , SV 8003 SV , SV 221 SV SV 322 SV , SV 301 SV , , 3, 4, 5 SV 323 SV , SV 331 SV , SV 332 SV , SV 333 SV , SV 334 SV , SV 327 SV , SV 327 SV , SV 327 SV , SV 327 SV , SV 328 SV , 3, 4, 5 SV 427 SV , 6, 7 Area1BV SV , 6, 7 Release Height Sigma Y Sigma Z Volume Sources (m) (m) (m) Heating PMF CoarseCrush SV , ,272, , , , 3, 4, 5 DH SV , ,272, , , , 3, 4, 5 FineCrush SV , ,272, , , , 3, 4, 5 Conc B V SV , ,272, , , , 3, 4, 5 Flot V SV , ,272, , , , 3, 4, 5 Conc Dewa V SV , ,271, , , , 3, 4, 5 Conc LO V SV , ,271, , , , 3, 4, 5 Rebuild V SV , ,272, , , , 3, 4, 5 Main WH V SV , ,272, , , , 3, 4, 5 Hydromet V SV , ,271, , , , 3, 4, 5 Gen Shop V SV , ,272, , , , 3, 4, 5 TBWWTPBV SV , ,272, , , , 3, 4, 5 Reagent V SV , ,271, , , , 3, 4, 5 Spares WH V SV , ,272, , , , 3, 4, 5 RubbSh V SV , ,272, , , , 3, 4, 5 LubeHs V SV , ,272, , , , 3, 4, 5 Heat Pl V SV , ,271, , , , 3, 4, 5 Area2BV SV , ,272, , , , 6, 7 CarDmp V SV , ,271, , , , 3, 4, 5 MDS 603 NA [A] [A] 62, , Mobile Diesels - Ore Haul Locomotives [B] E E E E E E E E , 8, 9 MDS 604 NA [A] [A] 62, , Mobile Diesels - Switcher Locomotive E E E E E E E E , 8, 9 MDS 605 NA , , Mobile Diesels - Tailings Basin Construction Vehicles E E E E E E E E , 8, 9 Class I Model Inputs Page 1 of 2 12/21/2016

15 Feet to Meters>> Speciation Notes: 1) Fraction of PM10 as PMF is set based on PM2.5 rate (PM2.5 rate = PMF rate), PMC is equal to PM10 - PMF. 2) Fraction of PM10 as PMF is set based on PM2.5 rate (PM2.5 = PMF + SOA + EC +SO4), PMC is equal to PM10 - PMF -EC -SOA -SO4. 3) Emission factor from AP-42 Table is 7.6 (total PM)/10 6 scf natural gas 5.5 VOC's % of Total Particulate assumed to be SOA = 5.5 lb VOCs/mmscf / 7.6 lb PM/mmscf = 72.4% 4) Assume all filterable PM emissions from natural gas combustion are EC AP-42 'Natural Gas Combustion' Table 1.4-2; Total PM Emission factor is 7.6 lb and filterable is 1.9 lb: EC, percent of PM10: 1.9 / 7.6 = 25.0% 5) SO2 emissions from natural gas fired sources are negligible, therefore SO4 emissions are assumed to be zero. All natural gas particulate is assumed to be PMF 6) Assume all filterable PM emissions from propane combustion are EC AP-42 'Liquified Petroleum Gas Combustion' Table (07/2008); Total PM Emission factor is 0.7 lb/10^3 gallon and filterable is 0.2 lb/10^3 gallon: EC, percent of PM10: 0.2 / 0.7 = 28.6% Assume condensible PM emissions from propane combustion are SOA SOA, percent of PM10: 0.5/0.7 = 71.4% 7) SO2 emissions from propane fired sources are negligible, therefore SO4 emissions are assumed to be zero. All propane particulate is assumed to be PMF (no PMC emissions) 8) Heavy Duty Diesel speciated emissions from US EPA SPECIATE 4.2, profile number (added 1/5/89) EC, percent of (PM10-SOA-SO4) 54.8 Assume SOA equals organic carbon speciation SOA, percent of PM All diesel particulate is assumed to be PMF (no PMC emissions) 9) The diesel sources are assumed to have no SO4 concentrations because the exhaust temperatures are higher than the temperatures at which the conversion of SO3 to H2SO4 vapor occurs. General Notes [A] [B] These sources not included in Class II modeling, so UTM coordinates have not been determined. Coordinates in columns D and E are used for Class I modeling. Ore haul locomotive emissions are divided in half because the other half will be assigne to the Rail Transfer Hopper (railcar loading location) at the Mine Site. Definitions PM10 PMC PMF EC SOA SO4 SO2 NOx particulate matter less than 10 microns (aerodynamic equivalent) coarse particulate matter, particulate mater 10 microns and >2.5 microns fine particulate matter, particulate matter 2.5 microns elemental carbon secondary organic aerosols sulfuric acid sulfur dioxide oxides of nitrogen Class I Model Inputs Page 2 of 2 12/21/2016