ESCO Corporation Title V Permit, No Annual Report. Emission Fee Report - Total Emissions by Regulated Pollutant and Source

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4 ESCO Corporation Title V Permit, No Annual Report Emission Fee Report - Total Emissions by Regulated Pollutant and Source

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6 Emissions by Source FORM F Reporting year: Facility name: ESCO Corporation, Main Plant and Plant 3 4. Emissions by emission source a. Group code (EU #, ES #, FS#, PS# or PSEL) b. Device or process ID c. Pollutant 3. Permit number: d. Emissions (tons) PSEL Plant-wide PM 134 Code 1 PSEL Plant-wide PM Code 1 PSEL Plant-wide PM Code 1 PSEL Plant-wide NO x 65 Code 1 EU MU-1 SO Code 2 e. Method f. Reference Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Detail Sheet version 11/30/2011 EU MU-2 SO Code 2 Detail Sheet version 11/30/2011 EU MU-10 SO Code 2 Detail Sheet version 11/30/2011 EU 3U-1 SO Code 2 Detail Sheet version 11/30/ Form F1102 page 1 of 2

7 EU 3U-2 SO Code 2 Detail Sheet version 11/30/2011 EU 3U-3 SO Code 2 Detail Sheet version 11/30/2011 EU 3U-10 SO Code 2 Detail Sheet version 11/30/2011 PSEL Plant-Wide Aggregate SO 2 1 Code 2 Detail Sheet version 11/30/2011 PSEL Plant-wide CO 348 Code 1 PSEL Plant-wide VOC 93 Code 1 PSEL Plant-wide GHG (CO2e basis) 74,000 Code 1 Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/2017. Title V Air Permit page 39. Issued 3/1/2012. Renewal 3/1/ Form F1102 page 2 of 2 Oregon DEQ Title V Operating Permit fee forms - Revised 01/31/12

8 ESCO Corporation Title V Permit, No Annual Report Semi-Annual Compliance Certification

9 Semi-Annual Compliance Certification FORM R1002 Answer Sheet Facility name: ESCO Corporation: Main Plant and Plant 3 Permit Number: Reporting period July 1 to December 31, Plan development/revision triggered [yes/no] No 3. Compliance status: a. Permit Condition Number b. Compliance Statues (C/I) 3 C 4 C 5 C 6 C 7 C 8 C 9 C 10 C 11 C 12 C 13 C 14 C 15 C 16 C 17 C 18 C 19 C 20 C 21 C 22 C 23 C 24 C 25 C 26 C 27 C 28 C 29 C 30 C 31 C 32 C 33 C 34 C 35 C 36 C 37 C 38 C 39 C 40 C 41 C c. Emissions Unit(s) d. Permit Deviation Type e. Number of Deviations Oregon Department of Environmental Quality Page 1 of 3 Oregon Title V Operating Permit Application Forms revised 1/31/12

10 Semi-Annual Compliance Certification FORM R1002 Answer Sheet 42 C 43 C 44 C 45 C 46 C 47 C 48 C 49 C 50 C 51 C 52 C 53 C 54 C 55 C 56 C 57 C 58 C 59 C 60 C 61 C 62 C 63 C 64 C 65 C 66 C 67 C 68 C 69 I F Non-EE See Feb. 12, 2016 Deviation Report 70 C 71 C 72 C 73 C 74 C 75 C 76 C 77 C 78 C 79 C 80 C 81 C 82 C 83 C 84 C 85 C 86 C 87 C 88 C Oregon Department of Environmental Quality Page 2 of 3 Oregon Title V Operating Permit Application Forms revised 1/31/12

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12 Semi-Annual Compliance Certification FORM R1003 Answer Sheet Facility name: ESCO Corporation: Main Plant and Plant 3 Permit Number: Reporting period July 1, 2015 through December 31, Summary of permit deviations: a. Permit Condition Number b. Emissions Unit(s) c. Cause d. Time Began e. Time Ended (date) (hour) (date) (hour) f. Deviation g. Corrective Action/Prevention 69 F mi 07/01 12/31 Non-EE See February 12, 2016 Deviation Report Oregon Department of Environmental Quality Page 1 of 1 Oregon Title V Operating Permit Application Forms revised 1/31/12

13 ESCO Corporation Title V Permit, No Annual Report Semi-Annual Compliance Certification NESHAP Subpart ZZZZZ

14 February 15, 2016 Subject: Semi-Annual Report pursuant to 40 CFR Part 63, Subpart ZZZZZ: National Emission Standards for Hazardous Air Pollutants (NESHAP) for Iron and Steel Foundry Area Sources ESCO Corporation submits the following semiannual report pursuant to the U.S. Environmental Protection Agency (EPA) s NESHAP for Iron and Steel Foundries Area Sources, 40 CFR (c). This report is for the affected large foundry sources, at the locations identified below. Name and address of owner or operator: ESCO Corporation 2141 NW 25 th Avenue Portland, OR Physical location and regulatory status of the affected source: ESCO Corporation Main Plant ESCO Corporation Plant NW 25 th Avenue 2211 NW Brewer Street Portland, OR Portland, OR Title V Air Permit No Title V Air Permit No Existing Source, Large Foundry Existing Source, Large Foundry Semiannual reporting period: 01-July-2015 thru 31-December Report due date: 15-February Summary Information: Management Practices for Metallic Scrap and Binder Formulation A. ESCO Corporation s Main Plant and Plant 3 foundries operated in compliance with written material specifications for metallic scrap according to 40 CFR (a)(1) of Subpart ZZZZZ, during the reporting period. ESCO Corporation has no deviations from those requirements to report. B. ESCO Corporation s Main Plant and Plant 3 foundries operated in compliance with written material specifications for general iron and steel scrap according to 40 CFR (a)(2) of Subpart ZZZZZ, during the reporting period. ESCO Corporation has no deviations from those requirements to report. C. ESCO Corporation s Main Plant and Plant 3 foundries operated in compliance with the no methanol requirement for the catalyst portion of each binder chemical formulation for a furfuryl alcohol warm box mold or core making line according to 40 CFR of Subpart ZZZZZ, during the reporting period. ESCO Corporation has no deviations from those requirements to report. Management Practices for Mercury Switch Removal ESCO Corporation s Main Plant and Plant 3 foundries operated in compliance with the requirements for scrap that does not contain motor vehicle scrap in accordance with 40 CFR (b)(4) of Subpart ZZZZZ, during the reporting period. ESCO Corporation has no deviations from those requirements to report. World Headquarters 2141 NW 25 th Avenue Portland, Oregon Phone: Fax:

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16 ESCO Corporation Title V Permit, No Annual Report Monthly Process Parameters and Emission Calculations Production Inputs PSEL Criteria Emissions PSEL HAP Emissions RACT Compliance Main Plant and Plant 3

17 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 2/1/ Jan-15 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 18, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 20, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

18 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 2/1/2014 1/31/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 11, , EAF 11, , AOD Doghouse 4, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 10, , EAF/Pouring Loop 10, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 42,345 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 506,165 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,489 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 5,646 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

19 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 2/1/2014 Thru 31-Jan-15 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-14 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , , , , , , , , ,585 1,579, Plant 3 Therms 39,032 42,587 46,370 42,895 37,270 40,765 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

20 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 2/1/2014 Thru 31-Jan-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-14 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 4, Paint usage from Paint/Coat Usage Logs Non-Clear 4, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

21 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 2/1/2014 Thru 31-Jan-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-14 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

22 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 3/1/ Feb-15 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 18, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 20, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

23 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 3/1/2014 2/28/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 11, , EAF 11, , AOD Doghouse 3, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 10, , EAF/Pouring Loop 10, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 40,707 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 517,165 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,630 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 5,428 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

24 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 3/1/2014 Thru 28-Feb-15 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , , , , , , , , ,585 1,553, Plant 3 Therms 39,032 46,892 46,370 42,895 37,270 40,765 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

25 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 3/1/2014 Thru 28-Feb-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 4, Paint usage from Paint/Coat Usage Logs Non-Clear 4, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

26 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 3/1/2014 Thru 28-Feb-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-14 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

27 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 4/1/ Mar-15 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 17, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 19, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

28 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 4/1/2014 3/31/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 10, , EAF 10, , AOD Doghouse 3, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 10, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 37,935 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 531,520 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,814 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 5,058 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

29 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 4/1/2014 Thru 31-Mar-15 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , , , , , , , , ,585 1,517, Plant 3 Therms 39,032 46,892 56,070 42,895 37,270 40,765 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

30 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 4/1/2014 Thru 31-Mar-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 4, Paint usage from Paint/Coat Usage Logs Non-Clear 4, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

31 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 4/1/2014 Thru 31-Mar-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-14 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

32 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 5/1/ Apr-15 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 17, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 19, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

33 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 5/1/2014 4/30/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 10, , EAF 10, , AOD Doghouse 2, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 36,311 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 541,090 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,937 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 4,841 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

34 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 5/1/2014 Thru 30-Apr-15 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , , , , , , , , ,585 1,479, Plant 3 Therms 39,032 46,892 56,070 50,025 37,270 40,765 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

35 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 5/1/2014 Thru 30-Apr-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 4, Paint usage from Paint/Coat Usage Logs Non-Clear 4, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

36 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 5/1/2014 Thru 30-Apr-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-14 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

37 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 6/1/ May-15 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 17, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 19, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

38 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 6/1/2014 5/31/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 9, , EAF 9, , AOD Doghouse 2, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 34,524 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 547,195 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,015 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 4,603 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

39 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 6/1/2014 Thru 31-May-15 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , , , , , , , , ,585 1,456, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 40,765 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

40 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 6/1/2014 Thru 31-May-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 4, Paint usage from Paint/Coat Usage Logs Non-Clear 3, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

41 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 6/1/2014 Thru 31-May-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

42 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 7/1/2014 6/30/2015 Emission Summary PSEL 11/30/2011 Revised: 2/12/2016 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 17, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 19, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

43 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 7/1/2014 6/30/15 Production Inputs PSEL 11/30/2011 Revised: 2/12/2016 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 9, , EAF 9, , AOD Doghouse 2, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 31,865 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 564,080 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,232 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 4,249 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

44 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 7/1/2014 Thru 6/30/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95, , , , , , ,585 1,421, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 37,622 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

45 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 7/1/2014 Thru 30-Jun-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 3, Paint usage from Paint/Coat Usage Logs Non-Clear 3, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

46 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 7/1/2014 Thru 30-Jun-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

47 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 8/1/2014 7/31/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 16, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 8, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 19, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

48 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 8/1/2014 7/31/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 8, , EAF 8, , AOD Doghouse 1, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 12, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 29,547 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 575,465 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,378 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 3,940 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

49 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 8/1/2014 Thru 7/31/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87, , , , , ,585 1,382, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 37,883 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

50 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 8/1/2014 Thru 31-Jul-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

51 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 8/1/2014 Thru 31-Jul-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Green Spray Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

52 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/2012 8/1/2014 7/31/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 16, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 18, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

53 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 8/1/2014 7/31/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 7, , EAF 7, , AOD Doghouse 1, V-Bay 2, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 12, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 26,982 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 578,325 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,414 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 3,598 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

54 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 8/1/2014 Thru 7/31/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-14 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87,499 87, , , , ,585 1,343, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 36,800 50,905 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

55 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 8/1/2014 Thru 31-Jul-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

56 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 8/1/2014 Thru 31-Jul-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied Green Spray Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

57 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/ /1/2014 9/30/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 16, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 18, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

58 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/ /1/2014 9/30/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 7, , EAF 7, , AOD Doghouse V-Bay 1, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 24,395 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 570,625 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,316 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 3,253 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

59 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 10/1/2014 Thru 9/30/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-14 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87,499 87,911 79, , , ,585 1,296, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 36,800 33,078 50,608 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

60 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 10/1/2014 Thru 30-Sep-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-14 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

61 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 10/1/2014 Thru 30-Sep-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied CLR Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

62 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/ /1/ /31/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 15, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 17, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

63 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/ /1/ /31/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 6, , EAF 6, , AOD Doghouse V-Bay 1, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 21,348 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 555,060 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 7,116 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 2,846 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

64 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 11/1/2014 Thru 10/31/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-14 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87,499 87,911 79,278 91, , ,585 1,252, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 36,800 33,078 34,752 49,361 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

65 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 11/1/2014 Thru 31-Oct-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-14 Jul-14 Aug-14 Sep-14 Oct-15 Nov-14 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,152 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

66 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 11/1/2014 Thru 31-Oct-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-14 Oct-14 Nov-14 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied CLR Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

67 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/ /1/ /30/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 15, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 16, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

68 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/ /1/ /30/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 6, , EAF 6, , AOD Doghouse - V-Bay 1, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 11, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 20,939 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 542,410 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,954 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 2,792 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 5 PSEL revised

69 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 12/1/2014 Thru 11/30/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-14 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87,499 87,911 79,278 91,715 95, ,585 1,217, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 36,800 33,078 34,752 36,059 53, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

70 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 12/1/2014 Thru 30-Nov-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-14 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,147 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,034 1,039 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear 0 #DIV/0! 3. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

71 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 12/1/2014 Thru 30-Nov-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-14 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied CLR Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

72 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Issue Date 3/1/ /1/ /30/2015 Emission Summary PSEL 11/30/2011 Pollutant Baseline/Netting Basis Previous PSEL Emission Inventory Estimate PSEL from permit tpy tpy tpy tpy PM PM2.5* CO NOx SO VOC Lead CO2e 25,826 14, ,000 Individual HAP Total HAPs * PM2.5 is a subset of PM10. Emissions assume PM2.5 is 100% of PM10. Hazardous Air Pollutants Pollutant Emission Inventory lb/yr tpy Lead Mn Ni Cr Hg Cd Co As Sb Se Phenol 7, Formaldehyde 3, Benzene 1, Cresols 1, Toluene Naphthalene Triethylamine Diisocyanates Trimethylbenzene POMs* Hexane Dichlorobenzene Acrolein Ethylbenzene Xylenes Biphenyl Aniline Acetaldehyde Methylnaphthalen Propionaldehyde Cyanide compound Dimethylaniline Tetrachloroethylen Trichloroethylene Cumene MIBK Styrene Total HAPs 16, Notes 9 tpy major source threshold from natural gas combustion 24 tpy major source threshold *POMs excluding naphthalene and methylnaphthalene

73 ESCO Corporation Air Permit No Facility name/site identifier ESCO Corp: Main Plant and Plant 3 Permit number Compliance Dates: Issue Date 3/1/2012 1/1/ /31/15 Production Inputs PSEL 11/30/2011 Main Plant Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Main Plant Total 6, , EAF 6, , AOD Doghouse - V-Bay 1, Main Floor/Slinger Bay 2, Chain Floor MP, 12 Month Rolling Gas Usage, mmcf: Plant 3 Tons Metal Melted Tons Metal Poured Location (Tmm/yr) (Tmp/yr) Plant 3 Total 11, , EAF/Pouring Loop 10, , Research Induction - - Research AOD -- - Induction P3, 12 Month Rolling Gas Usage, mmcf: Welding rods and wire 20,421 lb/yr based on 4.5 lb per tmp in MP P3 Resin usage 524,590 lb/yr based on 55 lb resin per tmp in P3 P3 Coated Sand Throughput 6,726 tons/yr Assumes 78 lb resin/ton sand in P3 MP Sand Usage 2,723 tons/yr based on 0.6 tons/tmp new sand into system Production Inputs 2 of 73 PSEL

74 Plant Site Emission Limits (PSEL) Natural Gas Usage - Yearly and Monthly 12/1/2014 Thru 11/30/2015 Enter Data into Yellow Cells Issue Date 3/1/2012 Rolling 12 Month Sum Rolling 12 Month Sum Month/Yr Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Total (therms) Total (mmcf) Main Plant Therms 124, , , , ,959 95,611 87,499 87,911 79,278 91,715 95, ,065 1,213, Plant 3 Therms 39,032 46,892 56,070 50,025 43,506 49,333 38,969 36,800 33,078 34,752 36,059 38, , Note; effective 01-Jan-10, Btu factor was changed to 1030 Btu/cu ft per Northwest Natural. Previously was 1036 Btu/cu ft.

75 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 12/1/2014 Thru 30-Nov-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Building 9; Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Tank Adjuster Thinner, HAP's-free (28400) added to Green Green Dip Enamel, Low HAP/VOC (28GG402) added to tank , Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, , , ,147 0 Operating Volume in Tank; 1202 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 1,202 Monthly VOC Paint content from given quantities of old, new and thinner as Applied Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake. 1, ,034 0 Operating Volume in Tank; 1089 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. Monthly VOC Paint content from given quantities of old, new and thinner as Applied , Building 4; Chain Dip-Painting Tank Adjuster Thinner, HAP's-free (28400) added to Red Red Dip Enamel, Low HAP/VOC (28RG401) added to tank Volume of old paint in tank at time of thinner addition. VOC content of old paint < original, however using original for calculations sake Operating Volume in Tank; 720 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. For RACT compliance includes all dip-paint colors Monthly avg. VOC Paint content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 3.5 Clear Coatings Tank Adjuster Thinner, HAP's-free (28400) added to Clear Clear Dip Enamel, Low HAP/VOC (28LG403) added to tank Volume of old clear coating in tank at time of thinner addition. VOC content of old clear coating < original, however using original for calculations sake Operating Volume in Tank; 578 gallons. VOC content averaged from given quantities of old, new and thinner. Represents material as applied. 578 Monthly avg. VOC Clear Coatings content from given quantities of old, new and thinner as applied RACT Limit (operating air permit, condition 13) 4.3 Total gallons/yr Wt Avg VOC lbs/gal NOTES: Total 2, Paint usage from Paint/Coat Usage Logs Non-Clear 2, The lower-end of the paint tank operating levels for each tank were used as a conservative volume for calculating normal tank operating volumes Clear 0 #DIV/0! 3. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. Paint VOC content can not be in excess of the limit. 4. Over time, the paint within the paint tanks thickens, especially if the paint is infrequently used, and may require adjustment (addition of thinner). Prior to any addition of thinner or water, the paint tank contents are viscosity tested by Drew Paint personnel to determine the quantity of material needed to thin the paint and maintain proper paint specifications for the process. If tank adjuster is needed, it is delivered to ESCO on an as-need basis; no adjuster is stored at ESCO. For purposes of calculating the RACT VOC content of paint in months when thinner is added, this spread sheet conservatively assumes that the VOC content of the paint in the tank (prior to thinning), is the same at the specified VOC content for new paint. In actuality, the paint tank VOC content is less than the "as purchased" VOC content (based on paint sampling results); testing data shows that the dip tank paint is more viscous, has lower VOC content and has greater solids content. 5. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 6. In-line averaging has been implemented, so that monthly average RACT VOC content of coatings, used on a single coating line is less than the applicable VOC content limit (low VOC coatings offset high VOC coatings). See, Wisconsin DNR 7. The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). Glycol went from non-hap to HAP, effective 01-Apr-05 Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. Main Plant dip painting usages only. Stopped using yellow dip-paint. Removed tanks from service 15Sep09. Dropped from monthly averaging for Aug, 2010 reporting. Started Red chain dip-painting at the Main Plant in Building 4, beginning Sep, As applied is also referred to as "ready for application". Per 14-Mar-11 call with George Davis; RACT compliance is based on the sum of coating types (listed in Cond. 13). Chain dip-tank usages summed with other "Force Air Dried or Air Dried Coatings".

76 Facility name/ site identifier ESCO Corp - Main Plant and Plant 3 Permit number Issue Date 3/1/2012 Reporting Period 12/1/2014 Thru 30-Nov-15 Coating RACT Limit Compliance Determination Emission Unit MU-9 COAT - Plant 3 Spray Painting Enter Data into Yellow Cells Based on daily average of coatings as applied Monthly Reconciliation of Coating/Paint (gallons) 12 Month Consumption (gal/yr) Coating MSDS VOC as Applied Content (lbs/gal) Air Dried Paint Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Green Spray Paint, low VOC & no HAP (07GG402); gallons , Monthly VOC Paint Content as Applied Cat Yellow Spray Paint, low VOC & no HAP (07YG502); gallons Monthly VOC Paint Content as Applied Red Spray Paint, low VOC & no HAP (07RG401); gallons Monthly VOC Paint Content as Applied CLR Paint, low VOC & no HAP (07GG402); gallons Monthly VOC Paint Content as Applied Total (gal/yr) wt avg VOC (lbs/gal) 2, Monthly avg. VOC Paint content from given quantities as Applied RACT Limit (operating air permit, condition 13) (OAR (j)(b) force air-dried or air-dried) 3.5 NOTES: 1. Paint usage from Plant 3 staff 2. All paint, as purchased from Drew Paint, has a VOC content that is less than the RACT VOC/gallon limit. 3. OAR "no person shall operate a coating line which emits into the atmosphere volatile organic compounds in excess of the limits of this rule". ESCO Paint and Packing operates only one coating line with several types of paint available on that one paint line. Only one type of paint is applied per casting. 4. In-line averaging has been implemented. See, Wisconsin DNR form SBCA-MCR The "coating VOC" (also known as the regulatory VOC) from the paint MSDS, is used for RACT compliance only. "Coating VOC" excludes water and exempt solvents and is expressed as a higher VOC number (the denominator is smaller). As an example: "coating VOC" = ((density of paint)(% total wt. of VOC - water and exempt VOC))/(100 - volume water - volume exempt). The "material VOC" is expressed as a lower number since nothing is extracted from the denominator. As an example, the CAT Yellow dip paint has a "coating VOC" content of 2.99 lb/gal; however, a portion of the original gallon of paint has been removed (water and exempt solvents) and the denominator is no longer one, but a fraction of one. Final RACT VOC emissions will be greater/higher than those reported on Air Permit form R1001-C (where the "material VOC" is used). See CARB example below. Effective 02-Mar-06, paint component; ethylene glycol monobutyl ether (EB) was de-listed by EPA/DEQ and is no longer a HAP. R & D Plant 3 spray painting from Jan-Nov, Went to full production spray painting beginning Dec, 2007; received Oregon DEQ approval. Effective 10-Mar-09, started using red spray paint at Plant 3. Beginning Jun-09, all P3 red parts are now dip-painted at the Main Plant. Plant 3 spray paint; water-based acrylic. As applied is also referred to as "ready for application".

77 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM10 Emissions PSEL 11/30/ Dec Nov-15 Issue Date Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 2.63E-01 lbs/tmm Average all source tests since 2005 rebagging 0.83 EAF-1 and EAF-2- fugitive 6316 tmm/yr 3.90E-01 lbs/tmm EAF factor, AP42 Table adjusted for capture 1.23 AOD-8- stack 5981 tmp/yr 8.42E-02 lbs/tmp Average all source tests 0.25 AOD-8- fugitive 5981 tmp/yr 3.90E-01 lbs/tmp EAF factor, AP42 Table adjusted for capture 1.17 Ladle dump back- fugitive 6316 tmm/yr 1.95E-01 lb/tmm Assume 50% of AOD fugitives 0.62 MU - 1 MELT TOTAL 4.10 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 4.90E-01 lbs/tmp Average all source tests 0.00 Doghouse cooling-griffin- Fugitive 0 tmp/yr 7.75E-01 lbs/tmp AP42 Table adjusted for capture 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 2.27E-01 lbs/tmp Average all source tests 0.00 Doghouse shakeout-fuller- Fugitive 0 tmp/yr 7.75E-01 lbs/tmp AP42 Table adjusted for capture 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 2.80E+00 lbs/tmp AP-42 Table , Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 4.20E+00 lbs/tmp AP-42 Table , V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 7.56E-01 lbs/tmp AP-42 Table , 1995 adjusted for capture & control 0.74 V-Bay P/C- Fugitive 1945 tmp/yr 4.20E-01 lbs/tmp AP-42 Table , 1995 adjusted for capture 0.41 Chain Floor P/C- Fugitive 275 tmp/yr 4.20E+00 lbs/tmp AP-42 Table , Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 1.79E-02 lbs/tmp Average all source tests 0.02 Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 8.50E-01 lbs/tmp AP42 Table adjusted for capture 1.10 V-Bay Shakeout- Stack 1945 tmp/yr 4.46E-02 lbs/tmp Main floor ST adjusted for capture and control 0.04 V-Bay Shakeout- Fugitive 1945 tmp/yr 8.50E-01 lbs/tmp AP42 Table adjusted for capture 0.83 MU - 2 PCS TOTAL 8.58 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 6.00E-01 lb/tmp Fact Sheet 9841, adjusted for control 1.36 Doghouse sand reclamation (Griffin) 0 tmp/yr 4.90E-01 lb/tmp used Griffin ST emission factor 0.00 Ladle knockout- stack 0.00E Scrap Handling- fugitive 6316 tmm/yr 3.60E-01 lb/tmp EPA, AP-42, Table (charge handling) 1.14 AP42 Table mini mill-uncontrolled Scrap burn booth-stack 632 tmm/yr 3.20E-02 lbs/tm billet cutting 0.01

78 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM10 Emissions PSEL 11/30/ Dec Nov-15 Issue Date Calculated Process Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Emissions (tons/yr) Slag Handling- fugitive 6316 tmm/yr 4.00E-03 lb/tmm AP-42 Table , low silt slag 0.01 Emission Unit totals (tons/yr) Sand Handling: Slinger bay, lower core room, upper core room, chain floor sand bins- stacks 2723 ton sand/yr 2.00E-01 lb/ton sand AP-42 Table , controlled 0.27 Rail car unloading 0.00E+00 Enclosed, no emission 0.00 Lime silo bin vent to baghouse- stack 0.00E MU-3-MH/SR TOTAL 2.79 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 3.10E-01 lbs/tmm Gutow, 1972 (100% CAP) 0.98 MU-4 S/SB TOTAL 0.98 MU-5 C/G Grinding- with control 5684 tmm/yr 8.50E-02 lbs/tmm Fact Sheet 9841, adjusted for 95% control 0.24 Grinding- no control 632 tmm/yr 1.70E+00 lbs/tmm Fact Sheet Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.78 MU-6 HOTWORK Upper Finishing Chain table welding- fugitive 408 lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 1.00E-01 lbs/tm AP42 Table , uncontrolled scarfing 0.02 Upper finishing- burning- stack 0 tmp/yr 3.20E-02 lbs/tm AP42 Table mini mill-uncontrolled billet cutting 0.00 Lower finishing- burning- stack 4538 tmp/yr 3.20E-02 lbs/tm AP42 Table mini mill-uncontrolled billet cutting 0.07 Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 1.00E-01 lbs/tm AP42 Table , uncontrolled scarfing 0.23 Lower finishing-welding- stack lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table High and Low Temp Heat-Treating 4538 tmp/yr 7.00E-02 lbs/tmp Gutow, MU-6 HOTWORK TOTAL 0.65 MU-7 MOLD/CORE Upper core room sand muller- stack 0 tmp/yr 3.10E-01 lb/tmp Gutow, Upper core room- core wash paint booth- stack 0 lb/yr 1.50E-02 lb/lb PM from overspray, 15% overspray, 90% control from filters 0.00 Green sand muller- loading hopper (Fuller) 0.00E+00 already accounted for in Doghouse shakeout 0.00 Green sand muller- wet mixing 0 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.00 Slinger Bay: mobile sand mixer- fugitive 2318 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.14 Chain floor core making- Palmer screw mixer- stack 275 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.02 MU-7 MOLD/CORE TOTAL 0.16 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 2.5 lbs/mmcf Oregon DEQ EF Main Plant Total Main Plant Stack 5.56 Main Plant Fugitive 12.63

79 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM10 Emissions PSEL 11/30/ Dec Nov-15 Issue Date Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Plant 3 3U-1 MELT EAF-5- stack tmm/yr 2.75E-02 lbs/tmm Average all source tests since 2007 new baghouse 0.15 EAF-5- fugitive tmm/yr 6.50E-01 lbs/tmm AP42 Table adjusted for capture 3.53 INDF-3- stack 185 tmm/yr 9.00E-03 lbs/tmm AP-42 Table adjusted for 90% control 0.00 INDF-4- fugitive 0 tmm/yr 9.00E-02 lbs/tmm AP-42 Table AOD-Res- stack 0 tmp/yr 6.78E-01 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 3.12E-01 lbs/tmp Average all source tests 1.49 Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 2.95E-01 lbs/tmp AP42 Table adjusted for capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 3.64E-02 lb/ton sand Pacific Steel source test, 0.12 Scrap Handling- fugitive 9538 tmp/yr 3.60E-01 lb/tmp EPA, AP-42, Table (charge handling) 1.72 Slag Handling- fugitive tmm/yr 4.00E-03 lb/tmm AP-42 Table , low silt slag 0.02 Material handling- bin vent filters- stacks 0.00E+00 R&D material handling- stack 0.00E+00 Ladle knockout- stack 0.00E+00 3U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 3.10E-01 lbs/tmm Gutow, 1972 (100% CAP) U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 8.50E-02 lbs/tmm Fact Sheet 9841, adjusted for control U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table High and Low Temp Heat-Treating- stacks 9538 tmp/yr 7.00E-02 lbs/tmp Gutow, U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack tons sand/yr 6.00E-03 lb/ton sand Pacific Steel source test 0.20 Mold & Core Making tmm/yr 1.20E-01 lbs/tmm Gutow, 1972 modified U-7 MOLD/CORE TOTAL 0.86

80 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM10 Emissions PSEL 11/30/ Dec Nov-15 Issue Date Emission Unit ID 3U-9 COATING Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) spray painting 2960 gal/yr 2.67E-01 lb/gal PM from overspray, 8.9 lb/gal paint, lb paint/tmp x % overspray, 90% filter control U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 2.50E+00 lbs/mmcf Oregon DEQ EF Plant 3 Total Plant 3 Stack 3.43 Plant 3 Fugitive 7.34 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas 1. MP EAF stack emission factor is average test data. Baghouse rebagged in MP EAF fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 13 lb/tmm and 97% capture efficiency. 3. AOD stack emision factor is average of source tests 4. AOD fugitive emission factor is calculated from an AP42 uncontrolled emission factor for EAFs of 13 lb/tmm and 97% capture efficiency 5. MP PCS (griffin and fuller) stack emission factor is average of source tests 6. MP PCS (griffin and fuller) fugitive emission factor is calculated from sum of AP42 emission factors for uncontrolled cooling and shakeout and 75% capture efficiency 7. MP Pouring fugitive emission factor is from AP42 emission factor for uncontrolled pouring. 8. MP pouring and cooling fugitive emission factor is for uncontrolled pouring plus cooling emission factors from AP MP shakeout fugitive emission factor is for uncontrolled shakeout factor from AP42 adjusted for capture 10. Emissions included in aggregate insignificant 11. Assumes 10% of tmm processed through activity 12. Assumes 2% of rod used for chain table 13. Used Iron & Steel production emission factor for uncontrolled scarfing for air arc activities 14. Used Steel minimill emission factor for uncontrolled billet cutting for burning (torch cutting) activities 15. Natural gas emission factor is Oregon DEQ emission factor 16. P3 EAF stack emission factor is average test data. New baghouse built in P3 EAF fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 13 lb/tmm and 95% capture efficiency. 18. P3 PCS stack emission factor is average of source tests 19. P3 PCS fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 5.9 lb/tmp and 95% capture efficiency. 20. Welding rod use at P3 incidental only. Assume 10% of MP usage 21. PM from spray coatings assumes 30% overspray and 90% control by paint booth filters 22. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factor for uncontrolled sand grinding/handling of 6 lb/tm 23. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factor for uncontrolled grinding/cleaning of 1.7 lb/tm Total Facility PM10 Emissions Current PSEL Main Plant + Plant 3 Total + 1 tpy aggregate ins Main Plant + Plant 3 Stack 8.99 Main Plant + Plant 3 Fugitive + 1 tpy aggregate 20.96

81 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM2.5 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 (Assumes PM2.5 is 100% of PM10) Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 2.63E-01 lbs/tmm Average all source tests since 2005 rebagging 0.83 EAF-1 and EAF-2- fugitive 6316 tmm/yr 3.90E-01 lbs/tmm EAF factor, AP42 Table adjusted for capture 1.23 AOD-8- stack 5981 tmp/yr 8.42E-02 lbs/tmp Average all source tests 0.25 AOD-8- fugitive 5981 tmp/yr 3.90E-01 lbs/tmp EAF factor, AP42 Table adjusted for capture 1.17 Ladle dump back- fugitive 6316 tmm/yr 1.95E-01 lb/tmm Assume 50% of AOD fugitives 0.62 MU - 1 MELT TOTAL 4.10 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 4.90E-01 lbs/tmp Average all source tests 0.00 Doghouse cooling-griffin- Fugitive 0 tmp/yr 7.75E-01 lbs/tmp AP42 Table adjusted for capture 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 2.27E-01 lbs/tmp Average all source tests 0.00 Doghouse shakeout-fuller- Fugitive 0 tmp/yr 7.75E-01 lbs/tmp AP42 Table adjusted for capture 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 2.80E+00 lbs/tmp AP-42 Table , Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 4.20E+00 lbs/tmp AP-42 Table , V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 7.56E-01 lbs/tmp AP-42 Table , 1995 adjusted for capture & control 0.74 V-Bay P/C- Fugitive 1945 tmp/yr 4.20E-01 lbs/tmp AP-42 Table , 1995 adjusted for capture 0.41 Chain Floor P/C- Fugitive 275 tmp/yr 4.20E+00 lbs/tmp AP-42 Table , Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 1.79E-02 lbs/tmp Average all source tests 0.02 Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 8.50E-01 lbs/tmp AP42 Table adjusted for capture 1.10 V-Bay Shakeout- Stack 1945 tmp/yr 4.46E-02 lbs/tmp Main floor ST adjusted for capture and control 0.04 V-Bay Shakeout- Fugitive 1945 tmp/yr 8.50E-01 lbs/tmp AP42 Table adjusted for capture 0.83 MU - 2 PCS TOTAL 8.58 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 6.00E-01 lb/tmp Fact Sheet 9841, adjusted for control 1.36 Doghouse sand reclamation (Griffin) 0 tmp/yr 4.90E-01 lb/tmp used Griffin ST emission factor 0.00 Ladle knockout- stack 0.00E Scrap Handling- fugitive 6316 tmm/yr 3.60E-01 lb/tmp EPA, AP-42, Table (charge handling) 1.14 Scrap burn booth-stack 632 tmm/yr 3.20E-02 lbs/tm AP42 Table mini mill-uncontrolled billet cutting 0.01 Slag Handling- fugitive 6316 tmm/yr 4.00E-03 lb/tmm AP-42 Table , low silt slag 0.01

82 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM2.5 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 (Assumes PM2.5 is 100% of PM10) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Sand Handling: Slinger bay, lower core room, upper core room, chain floor sand bins- stacks 2723 ton sand/yr 2.00E-01 lb/ton sand AP-42 Table , controlled 0.27 Rail car unloading 0.00E+00 Enclosed, no emission 0.00 Lime silo bin vent to baghouse- stack 0.00E MU-3-MH/SR TOTAL 2.79 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 3.10E-01 lbs/tmm Gutow, 1972 (100% CAP) 0.98 MU-4 S/SB TOTAL 0.98 MU-5 C/G Grinding- with control 5684 tmm/yr 8.50E-02 lbs/tmm Fact Sheet 9841, adjusted for 95% control 0.24 Grinding- no control 632 tmm/yr 1.70E+00 lbs/tmm Fact Sheet Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.78 MU-6 HOTWORK Upper Finishing Chain table welding- fugitive 408 lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 1.00E-01 lbs/tm AP42 Table , uncontrolled scarfing 0.02 Upper finishing- burning- stack 0 tmp/yr 3.20E-02 lbs/tm AP42 Table mini mill-uncontrolled billet cutting 0.00 Lower finishing- burning- stack 4538 tmp/yr 3.20E-02 lbs/tm AP42 Table mini mill-uncontrolled billet cutting 0.07 Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 1.00E-01 lbs/tm AP42 Table , uncontrolled scarfing 0.23 Lower finishing-welding- stack lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table High and Low Temp Heat-Treating 4538 tmp/yr 7.00E-02 lbs/tmp Gutow, MU-6 HOTWORK TOTAL 0.65 MU-7 MOLD/CORE Upper core room sand muller- stack 0 tmp/yr 3.10E-01 lb/tmp Gutow, Upper core room- core wash paint booth- stack 0 lb/yr 1.50E-02 lb/lb PM from overspray, 15% overspray, 90% control from filters 0.00 Green sand muller- loading hopper (Fuller) 0.00E+00 already accounted for in Doghouse shakeout 0.00 Green sand muller- wet mixing 0 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.00 Slinger Bay: mobile sand mixer- fugitive 2318 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.14 Chain floor core making- Palmer screw mixer- stack 275 tmp/yr 1.20E-01 lb/tmp Gutow, 1972 modified 0.02 MU-7 MOLD/CORE TOTAL 0.16 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 2.5 lbs/mmcf Oregon DEQ EF Main Plant Total Main Plant Stack 5.56 Main Plant Fugitive 12.63

83 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM2.5 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 (Assumes PM2.5 is 100% of PM10) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Plant 3 3U-1 MELT EAF-5- stack tmm/yr 2.75E-02 lbs/tmm Average all source tests since 2007 new baghouse 0.15 EAF-5- fugitive tmm/yr 6.50E-01 lbs/tmm AP42 Table adjusted for capture 3.53 INDF-3- stack 185 tmm/yr 9.00E-03 lbs/tmm AP-42 Table adjusted for 90% control 0.00 INDF-4- fugitive 0 tmm/yr 9.00E-02 lbs/tmm AP-42 Table AOD-Res- stack 0 tmp/yr 6.78E-01 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 3.12E-01 lbs/tmp Average all source tests 1.49 Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 2.95E-01 lbs/tmp AP42 Table adjusted for capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 3.64E-02 lb/ton sand Pacific Steel source test, 0.12 Scrap Handling- fugitive 9538 tmp/yr 3.60E-01 lb/tmp EPA, AP-42, Table (charge handling) 1.72 Slag Handling- fugitive tmm/yr 4.00E-03 lb/tmm AP-42 Table , low silt slag 0.02 Material handling- bin vent filters- stacks 0.00E+00 R&D material handling- stack 0.00E+00 Ladle knockout- stack 0.00E+00 3U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 3.10E-01 lbs/tmm Gutow, 1972 (100% CAP) U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 8.50E-02 lbs/tmm Fact Sheet 9841, adjusted for control U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 1.84E+01 lb/1000 lb AP-42 Table High and Low Temp Heat-Treating- stacks 9538 tmp/yr 7.00E-02 lbs/tmp Gutow, U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack tons sand/yr 6.00E-03 lb/ton sand Pacific Steel source test 0.20 Mold & Core Making tmm/yr 1.20E-01 lbs/tmm Gutow, 1972 modified U-7 MOLD/CORE TOTAL 0.86

84 ESCO Corp: Main Plant and Plant 3 Compliance Dates: PM2.5 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 (Assumes PM2.5 is 100% of PM10) Emission Unit ID 3U-9 COATING Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) spray painting 2960 gal/yr 2.67E-01 lb/gal PM from overspray, 8.9 lb/gal paint, lb paint/tmp x % overspray, 90% filter control U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 2.50E+00 lbs/mmcf Oregon DEQ EF Plant 3 Total Plant 3 Stack 3.43 Plant 3 Fugitive 7.34 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas 1. MP EAF stack emission factor is average test data. Baghouse rebagged in MP EAF fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 13 lb/tmm and 97% capture efficiency. 3. AOD stack emision factor is average of source tests 4. AOD fugitive emission factor is calculated from an AP42 uncontrolled emission factor for EAFs of 13 lb/tmm and 97% capture efficiency 5. MP PCS (griffin and fuller) stack emission factor is average of source tests 6. MP PCS (griffin and fuller) fugitive emission factor is calculated from sum of AP42 emission factors for uncontrolled cooling and shakeout and 75% capture efficiency 7. MP Pouring fugitive emission factor is from AP42 emission factor for uncontrolled pouring. 8. MP pouring and cooling fugitive emission factor is for uncontrolled pouring plus cooling emission factors from AP MP shakeout fugitive emission factor is for uncontrolled shakeout factor from AP42 adjusted for capture 10. Emissions included in aggregate insignificant 11. Assumes 10% of tmm processed through activity 12. Assumes 2% of rod used for chain table 13. Used Iron & Steel production emission factor for uncontrolled scarfing for air arc activities 14. Used Steel minimill emission factor for uncontrolled billet cutting for burning (torch cutting) activities 15. Natural gas emission factor is Oregon DEQ emission factor 16. P3 EAF stack emission factor is average test data. New baghouse built in P3 EAF fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 13 lb/tmm and 95% capture efficiency. 18. P3 PCS stack emission factor is average of source tests 19. P3 PCS fugitive emission factor is calculated from an AP42 uncontrolled emission factor of 5.9 lb/tmp and 95% capture efficiency. 20. Welding rod use at P3 incidental only. Assume 10% of MP usage 21. PM from spray coatings assumes 30% overspray and 90% control by paint booth filters 22. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factor for uncontrolled sand grinding/handling of 6 lb/tm 23. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factor for uncontrolled grinding/cleaning of 1.7 lb/tm Total Facility PM10 Emissions Current PSEL Main Plant + Plant 3 Total + 1 tpy aggregate in Main Plant + Plant 3 Stack 8.99 Main Plant + Plant 3 Fugitive + 1 tpy aggregate 20.96

85 ESCO Corp: Main Plant and Plant 3 Compliance Dates: CO Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Main Plant MU - 1 MELT EAF-1 and EAF-2- stack 6316 tmm/yr 4.30E+00 lbs/tmm Average all source tests EAF-1 and EAF-2- fugitive 6316 tmm/yr 1.33E-01 lbs/tmm avg. ST, adjusted for capture 0.42 MetalTek International, 2.74 lb/tm source AOD-8- stack 5981 tmp/yr 2.66E+00 lbs/tmp test 7.95 MetalTek International, 2.74 lb/tm source AOD-8- fugitive 5981 tmp/yr 8.22E-02 lbs/tmp test 0.25 Ladle dump back- fugitive 6316 tmm/yr lb/tmm 0.00 MU - 1 MELT TOTAL MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 8.88E-01 lbs/tmp same as fuller 0.00 Doghouse cooling-griffin- Fugitive 0 tmp/yr 2.96E-01 lbs/tmp same as fuller 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 8.88E-01 lbs/tmp 2002 ST X Doghouse shakeout-fuller- Fugitive 0 tmp/yr 2.96E-01 lbs/tmp 2002 ST X 1.2, adjusted for capture 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 1.18E+00 lbs/tmp same as fuller 0.00 Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.18E+00 lbs/tmp same as fuller 1.37 V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 1.07E+00 lbs/tmp same as fuller adjusted for capture 1.04 V-Bay P/C- Fugitive 1945 tmp/yr 1.18E-01 lbs/tmp same as fuller adjusted for capture 0.12 Chain Floor P/C- Fugitive 275 tmp/yr 1.18E+00 lbs/tmp same as fuller 0.16 Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 5.92E-01 lbs/tmp same as fuller adjusted for capture 0.77 Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 5.92E-01 lbs/tmp same as fuller adjusted for capture 0.77 V-Bay Shakeout- Stack 1945 tmp/yr 5.92E-01 lbs/tmp same as fuller adjusted for capture 0.58 V-Bay Shakeout- Fugitive 1945 tmp/yr 5.92E-01 lbs/tmp same as fuller adjusted for capture 0.58 MU - 2 PCS TOTAL 5.37 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr lb/tmp 0.00 Doghouse sand reclamation (Griffin) 0 lb/tmp 0.00 Ladle knockout- stack tmp/yr 0.00 Scrap Handling- fugitive 6316 tmm/yr lb/tmp 0.00 Scrap burn booth-stack 632 Slag Handling- fugitive 6316 tmm/yr lb/tmm 0.00 Slinger bay, lower core room, chain floor sand bins- stack 2723 ton sand/yr lb/ton sand 0.00 Rail car unloading 0.00 Upper core sand bins (Fuller) 0 tmp/yr lb/tmp 0.00 Lime silo bin vent filter- stack 0.00 MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm 0.00 MU-4 S/SB TOTAL 0.00

86 ESCO Corp: Main Plant and Plant 3 Compliance Dates: CO Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm 0.00 Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr lb/1000 lb 0.00 Upper finishing- air arc & welding- stack 454 Upper finishing- burning- stack 0 tmp/yr lbs/tmp 0.00 Lower finishing- burning- stack 4538 lbs/tmp 0.00 Lower finishing-air arc- stack Lower finishing-welding- stack lb rod/yr lb/1000 lb 0.00 High and Low Temp Heat-Treating 4538 tmp/yr lbs/tmp 0.00 MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Oil core oven (3% of production only) 136 tmp/yr lb/tmp 0.00 Upper core room sand muller- stack 0 tmp/yr lb/tmp 0.00 Upper core room- core wash paint booth- stack 0.00 Green sand muller- loading hopper (Fuller) 0.00 Green sand muller- wet mixing 0 tmp/yr lb/tmp 0.00 Slinger sand mixer- stack 2318 tmp/yr lb/tmp 0.00 Chain floor core making- screw mixer- stack 275 tmp/yr lb/tmp 0.00 MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 84 lbs/mmcf Oregon DEQ EF Main Plant Total Main Plant Stack Main Plant Fugitive 3.66 Plant 3 3U-1 MELT EAF-5- stack tmm/yr 5.67E+00 lbs/tmm Average all source tests EAF-5- fugitive tmm/yr 2.99E-01 lbs/tmm avg. ST, adjusted for capture 1.62 INDF-3- stack 185 tmm/yr 2.74E+00 lbs/tmm MP AOD emission factor 0.25 INDF-4- fugitive 0 tmm/yr 2.74E+00 lbs/tmm MP AOD emission factor 0.00 AOD-Res- stack 0 tmp/yr 2.74E+00 lbs/tmp MP AOD emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.38E+01 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 7.24E-01 lbs/tmp avg. ST adjusted for capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 9.80E-02 lb/ton sand Andritz Inc air permit emission rates U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK

87 ESCO Corp: Main Plant and Plant 3 Compliance Dates: CO Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) totals (tons/yr) 3U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 8.40E+01 lbs/mmcf Oregon DEQ EF Plant 3 Total Plant 3 Stack Plant 3 Fugitive 5.07 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility CO Emissions Current PSEL Main Plant + Plant 3 Total + 1 tpy aggregate in Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive + 1 tpy aggregate 9.73

88 ESCO Corp: Main Plant and Plant 3 Compliance Dates: NOx Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT EAF-1 and EAF-2- stack 6316 tmm/yr 8.40E-01 lbs/tmm Average all source tests 2.65 EAF-1 and EAF-2- fugitive 6316 tmm/yr 2.60E-02 lbs/tmm avg. ST, adjusted for capture 0.08 AOD-8- stack 5981 tmp/yr 8.40E-01 lbs/tmp EAF emission factor 2.51 AOD-8- fugitive 5981 tmp/yr 2.60E-02 lbs/tmp EAF emission factor 0.08 Ladle dump back- fugitive 6316 tmm/yr 2.60E-02 lb/tmm EAF emission factor 0.08 MU - 1 MELT TOTAL 5.41 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.00E-02 lbs/tmp Fact sheet No Doghouse cooling-griffin- Fugitive 0 tmp/yr 2.50E-03 lbs/tmp adjusted for capture 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 0.00E+00 lbs/tmp Fact sheet No Doghouse shakeout-fuller- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 1.00E-02 lbs/tmp Fact sheet No Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.00E-02 lbs/tmp Fact sheet No V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 9.00E-03 lbs/tmp Fact sheet No 9841 adjusted for capture 0.01 V-Bay P/C- Fugitive 1945 tmp/yr 1.00E-03 lbs/tmp Fact sheet No 9841 adjusted for capture 0.00 Chain Floor P/C- Fugitive 275 tmp/yr 1.00E-02 lbs/tmp Fact sheet No Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 5.00E-03 lbs/tmp Fact sheet No Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 5.00E-03 lbs/tmp 0.01 V-Bay Shakeout- Stack 1945 tmp/yr 5.00E-03 lbs/tmp Fact sheet No V-Bay Shakeout- Fugitive 1945 tmp/yr 5.00E-03 lbs/tmp 0.00 MU - 2 PCS TOTAL 0.05 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 100 lbs/mmcf Oregon DEQ EF Main Plant Total Main Plant Stack Main Plant Fugitive 0.27

89 ESCO Corp: Main Plant and Plant 3 Compliance Dates: NOx Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Plant 3 3U-1 MELT EAF-5- stack tmm/yr 2.03E+00 lbs/tmm Average all source tests EAF-5- fugitive tmm/yr 1.07E-01 lbs/tmm avg. ST, adjusted for capture 0.58 INDF-3- stack 185 tmm/yr 2.14E+00 lbs/tmm EAF emission factor 0.20 Emission Unit totals (tons/yr) INDF-4- fugitive 0 tmm/yr 2.14E+00 lbs/tmm EAF emission factor 0.00 AOD-Res- stack 0 tmp/yr 2.14E+00 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.00E-02 lbs/tmp Fact sheet No Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 5.26E-04 lbs/tmp adjusted for capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 3.45E-01 lb/ton sand Andritz Inc air permit emission rates U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 1.00E+02 lbs/mmcf Oregon DEQ EF Plant 3 Total Plant 3 Stack Plant 3 Fugitive 0.58 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas 1. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factors for uncontrolled emissions Total Facility NOx Emissions Current PSEL Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive 0.85

90 ESCO Corp: Main Plant and Plant 3 Compliance Dates: SO2 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT EAF-1 and EAF-2- stack 6316 tmm/yr 2.56E-01 lbs/tmm 2001 ST x EAF-1 and EAF-2- fugitive 6316 tmm/yr 7.20E-03 lbs/tmm Fact sheet No 9841, adjusted for capture 0.02 AOD-8- stack 5981 tmp/yr 0.00E+00 lbs/tmp sulfur lost in EAF 0.00 AOD-8- fugitive 5981 tmp/yr 0.00E+00 lbs/tmp sulfur lost in EAF 0.00 Ladle dump back- fugitive 6316 tmm/yr 0.00E+00 lb/tmm sulfur lost in EAF 0.00 MU - 1 MELT TOTAL 0.83 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 2.00E-02 lbs/tmp Fact sheet No Doghouse cooling-griffin- Fugitive 0 tmp/yr 5.00E-03 lbs/tmp adjusted for capture 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 0.00E+00 lbs/tmp Fact sheet No Doghouse shakeout-fuller- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp adjusted for capture 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 2.00E-02 lbs/tmp Fact sheet No Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 2.00E-02 lbs/tmp Fact sheet No V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 1.80E-02 lbs/tmp Fact sheet No 9841 adjusted for capture 0.02 V-Bay P/C- Fugitive 1945 tmp/yr 2.00E-03 lbs/tmp Fact sheet No 9841 adjusted for capture 0.00 Chain Floor P/C- Fugitive 275 tmp/yr 2.00E-02 lbs/tmp Fact sheet No Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 0.00E+00 lbs/tmp Fact sheet No Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 0.00E+00 lbs/tmp 0.00 V-Bay Shakeout- Stack 1945 tmp/yr 0.00E+00 lbs/tmp Fact sheet No V-Bay Shakeout- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp 0.00 MU - 2 PCS TOTAL 0.05 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 2.6 lbs/mmcf Oregon DEQ EF Main Plant Total 1.03 Main Plant Stack 0.98 Main Plant Fugitive 0.05

91 ESCO Corp: Main Plant and Plant 3 Compliance Dates: SO2 Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Plant 3 3U-1 MELT EAF-5- stack tmm/yr 3.36E-02 lbs/tmm 2002 ST x EAF-5- fugitive tmm/yr 1.20E-02 lbs/tmm Fact sheet No 9841, adjusted for capture 0.07 INDF-3- stack 185 tmm/yr 4.56E-02 lbs/tmm EAF emission factor 0.00 Emission Unit totals (tons/yr) INDF-4- fugitive 0 tmm/yr 4.56E-02 lbs/tmm EAF emission factor 0.00 AOD-Res- stack 0 tmp/yr 0.00E+00 lbs/tmp sulfur lost in EAF U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 2.00E-02 lbs/tmp Fact sheet No Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 1.05E-03 lbs/tmp adjusted for capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 5.80E-02 lb/ton sand Andritz Inc air permit emission rate U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 2.60E+00 lbs/mmcf Oregon DEQ EF Plant 3 Total 0.61 Plant 3 Stack 0.54 Plant 3 Fugitive 0.07 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas 1. Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factors for uncontrolled emissions 2. No sulfur present in MSDS for resin, catalyst or sand. SO2 from natural gas included in emission unit 3U-10 NG. Total Facility SO2 Emissions Current PSEL Main Plant + Plant 3 Total + 1 tpy aggregate ins Main Plant + Plant 3 Stack 1.52 Main Plant + Plant 3 Fugitive + 1 tpy aggregate 1.12

92 ESCO Corp: Main Plant and Plant 3 Compliance Dates: VOC Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT EAF-1 and EAF-2- stack 6316 tmm/yr 3.50E-01 lbs/tmm Fact sheet No EAF-1 and EAF-2- fugitive 6316 tmm/yr 1.08E-02 lbs/tmm adjusted for 97% capture 0.03 AOD-8- stack 5981 tmp/yr 0.00E+00 lbs/tmp process knowledge 0.00 AOD-8- fugitive 5981 tmp/yr 0.00E+00 lbs/tmp process knowledge 0.00 Ladle dump back- fugitive 6316 tmm/yr 0.00E+00 lb/tmm process knowledge 0.00 MU - 1 MELT TOTAL 1.14 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.05E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.00 Doghouse cooling-griffin- Fugitive 0 tmp/yr 3.50E-02 lbs/tmp Fact sheet No 9841, adjusted for capture 0.00 Doghouse shakeout-fuller- Stack 0 tmp/yr 9.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.00 Doghouse shakeout-fuller- Fugitive 0 tmp/yr 3.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.00 Doghouse Pouring- Fugitive 0 tmp/yr 1.40E-01 lbs/tmp Fact sheet No Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.40E-01 lbs/tmp Fact sheet No V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 1.26E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.12 V-Bay P/C- Fugitive 1945 tmp/yr 1.40E-02 lbs/tmp Fact sheet No 9841, adjusted for capture 0.01 Chain Floor P/C- Fugitive 275 tmp/yr 1.80E+00 lbs/tmp Fact shee No times 2 for binders in both molds and cores 0.25 Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 6.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.78 Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 6.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.78 V-Bay Shakeout- Stack 1945 tmp/yr 6.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.58 V-Bay Shakeout- Fugitive 1945 tmp/yr 6.00E-01 lbs/tmp Fact sheet No 9841, adjusted for capture 0.58 MU - 2 PCS TOTAL 3.27 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 1.40E-01 lb/tmp Assumes same as doghouse pouring 0.32 Doghouse sand reclamation (Griffin) 0 tmp/yr 1.40E-01 lb/tmp Assumes same as doghouse pouring 0.00 MU-3-MH/SR TOTAL 0.32 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 5.00E-01 lb/tmp AFS/CISA, Ashland Chemical 1.13 Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 1.04E+00 lb/tmp Material balance* Chain floor core making- screw mixer- stack 275 tmp/yr 5.00E-01 lb/tmp AFS/CISA, Ashland Chemical 0.07 MU-7 MOLD/CORE TOTAL 3.57 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 4538 tmp/yr 1.48E-01 lb/tmp Material balance 2009 X MU-8 VOC TOTAL MU-9 COATING All dip painting 2285 gal/yr 3.91E+00 lbs/gal Total paint and adjuster added multiplied by average lbs/gal MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 5.5 lbs/mmcf Oregon DEQ EF Main Plant Total Main Plant Stack 2.91 Main Plant Fugitive 10.51

93 ESCO Corp: Main Plant and Plant 3 Compliance Dates: VOC Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Plant 3 3U-1 MELT EAF-5- stack tmm/yr 3.50E-01 lbs/tmm Fact sheet EAF-5- fugitive tmm/yr 1.84E-02 lbs/tmm fact sheet, adjusted for 95% capture 0.10 INDF-3- stack 185 tmm/yr 3.68E-01 lbs/tmm EAF emission factor 0.03 INDF-4- fugitive 0 tmm/yr 3.68E-01 lbs/tmm EAF emission factor 0.00 AOD-Res- stack 0 tmp/yr 3.68E-01 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.10E+00 lbs/tmp 2001 ST x Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 5.79E-02 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 4.80E-02 lb/tons sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 1.10E+01 lb/ton resin avg. Phenol + formaldehyde ST 1.45 Core and Mold Making- vent 262 ton resin/yr 1.54E+01 lb/ton resin avg. Phenol + formaldehyde ST 2.03 Core and Mold Making- fugitive 262 ton resin/yr 1.72E+00 lb/ton resin ST adjusted for capture U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 7.20E-02 lb/tmm Material Balance 2009 X U-8 VOC TOTAL U-9 COATING spray painting 2960 gal/yr 1.18E+00 lbs/gal Total paint and adjuster added multiplied by average lbs/gal U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 5.50E+00 lbs/mmcf Oregon DEQ EF Plant 3 Total Plant 3 Stack Plant 3 Fugitive 1.00 NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Foundries Emission Calculation Fact Sheet 9841, Michigan DEQ, Rev. 11/2005, Factors for uncontrolled emissions, quality of scrap unknown Core washes, VOC chemicals, and paint VOCs estimated using material balance from 2009 Total Facility VOC Emissions Current PSEL Main Plant + Plant 3 Total + 1 tpy aggregate ins Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive + 1 tpy aggregate 12.50

94 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Lead Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 1.70E-03 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 1.34E-03 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 1.30E-04 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 5.63E-04 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 2.82E-04 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.01 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 9.21E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 1.46E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 4.27E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 1.46E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 5.26E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 7.89E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 1.42E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 7.89E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 7.89E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 1.17E-06 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 1.60E-04 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 2.91E-06 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 1.60E-04 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) E+00 lb/tmp Process knowledge Ladle knockout- stack 0.00E+00 Process knowledge Scrap Handling- fugitive 6316 tmm/yr 0.00E+00 lb/tmp Process knowledge Scrap burn booth-stack 632 tmm/yr 0.00E+00 lbs/tm Process knowledge Slag Handling- fugitive 6316 tmm/yr 0.00E+00 lb/tmm Sand Handling: Slinger bay, lower core room, upper core room, chain floor sand bins- stacks 2723 ton sand/yr 3.00E-04 lb/ton sand Process knowledge Rail car unloading 0.00E+00 Enclosed, no emission Lime silo bin vent to baghouse- stack 0.00E+00 Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 2.48E-06 lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr 0.00E+00 lbs/tmm Grinding- no control 632 tmm/yr 0.00E+00 lbs/tmm Carpentry shop 0.00E+00

95 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Lead Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 6.48E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 2.07E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 2.07E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 6.48E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 1.12E-04 lbs/tmm EAF-5- fugitive tmm/yr 1.84E-03 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 2.54E-05 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 2.54E-04 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 1.95E-03 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 5.00E-05 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 5.55E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 6.10E-05 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 2.48E-06 lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 0.00E+00 lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section

96 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Lead Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Plant 3 Total Plant 3 Stack Plant 3 Fugitive Emission Unit totals (tons/yr) Total Facility Lead Emissions Current PSEL Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests.

97 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Manganese Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 8.58E-03 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 6.72E-03 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 1.80E-03 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 7.80E-03 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 3.90E-03 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.09 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.84E-04 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 2.91E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 8.55E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 2.91E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 1.05E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.58E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 2.84E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 1.58E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 1.58E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 2.33E-06 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 3.20E-04 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 5.83E-06 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 3.20E-04 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 3.72E-04 lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr 2.34E-03 lbs/tmm Grinding- no control 632 tmm/yr 2.34E-03 lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.01 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 1.03E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 3.26E-03 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 1.04E-03 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 1.04E-03 lbs/tm assumed PM emission times metal content of EAF baghouse dust

98 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Manganese Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Production Rate (yearly) Emission Factors Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Factor Reference assumed PM emission times metal content of EAF baghouse dust Emission Unit totals (tons/yr) Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 3.26E-03 lbs/tm Lower finishing-welding- stack lb rod/yr 1.03E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.02 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 3.35E-04 lbs/tmm EAF-5- fugitive tmm/yr 4.21E-03 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 5.83E-05 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 5.83E-04 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 4.55E-03 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.00E-04 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 4.44E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 5.15E-05 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 4.03E-04 lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 2.34E-03 lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 1.03E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Mn Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

99 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Nickel Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 3.80E-04 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 2.98E-04 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 2.10E-04 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 9.10E-04 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 4.55E-04 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.01 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 9.21E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 1.46E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 4.27E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 1.46E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 5.26E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 7.89E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 1.42E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 7.89E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 7.89E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 1.17E-06 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 1.60E-04 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 1.50E-06 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 1.60E-04 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 2.95E-04 lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr 4.84E-04 lbs/tmm Grinding- no control 632 tmm/yr 4.84E-04 lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 5.00E-03 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 1.44E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 4.61E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 4.61E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 1.44E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 5.00E-03 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

100 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 5.40E-04 lbs/tmm EAF-5- fugitive tmm/yr 3.26E-03 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 4.51E-05 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 4.51E-04 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 3.80E-03 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 5.00E-05 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 5.55E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 2.93E-05 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 9.30E-05 lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 4.84E-04 lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 5.00E-03 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Ni Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

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102 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Chromium Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 6.60E-04 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 5.17E-04 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 9.50E-05 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 4.12E-04 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 2.06E-04 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.01 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 5.53E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 8.74E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 2.56E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 8.74E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 3.16E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 4.74E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 8.53E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 4.74E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 4.74E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 6.99E-07 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 9.59E-05 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 9.01E-07 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 9.59E-05 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 3.10E-04 lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr 8.33E-04 lbs/tmm Grinding- no control 632 tmm/yr 8.33E-04 lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 6.00E-03 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 2.51E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 8.03E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 8.03E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 2.51E-04 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 6.00E-03 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

103 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 7.09E-05 lbs/tmm EAF-5- fugitive tmm/yr 6.44E-04 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 8.92E-06 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 8.92E-05 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 7.15E-04 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 3.00E-05 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 3.33E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 1.86E-05 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 2.48E-04 lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 8.33E-04 lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 6.00E-03 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 1.40E-03 lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Cr Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

104

105 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Mercury Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 1.20E-05 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 9.43E-06 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 1.50E-06 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 6.50E-06 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 3.25E-06 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse cooling-griffin- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse Pouring- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Chain Floor P/C- Fugitive 275 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr 0.00E+00 lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr 0.00E+00 lbs/tmm Grinding- no control 632 tmm/yr 0.00E+00 lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 0.00E+00 lbs/tm Process knowledge Upper finishing- burning- stack 0 tmp/yr 0.00E+00 lbs/tm Process knowledge Lower finishing- burning- stack 4538 tmp/yr 0.00E+00 lbs/tm Process knowledge Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 0.00E+00 lbs/tm Process knowledge Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total

106 Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 1.19E-05 lbs/tmm EAF-5- fugitive tmm/yr 1.31E-04 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 1.81E-06 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 1.81E-05 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 1.43E-04 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 0.00E+00 lbs/tmp not detected in EAF source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 0.00E+00 lbs/tmp not detected in EAF source tests U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr 0.00E+00 lbs/tmm Process knowledge U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr 0.00E+00 lbs/tmm Process knowledge U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Hg Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

107

108 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Cadmium Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 2.17E-05 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 1.70E-05 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 1.00E-05 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 4.33E-05 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 2.17E-05 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.84E-04 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 2.91E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 8.55E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 2.91E-04 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 1.05E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.58E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 2.84E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 1.58E-04 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 1.58E-03 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 2.33E-06 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 3.20E-04 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 3.00E-06 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 3.20E-04 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 8.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 2.56E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 2.56E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 8.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

109 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 1.37E-05 lbs/tmm EAF-5- fugitive tmm/yr 1.51E-04 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 2.10E-06 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 2.10E-05 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 1.65E-04 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.00E-04 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 1.11E-04 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 2.71E-06 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Cd Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive Metals content calculated from metals in source tests divided by PM in source tests.

110

111 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Cobalt Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 1.71E-05 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 1.34E-05 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 8.00E-06 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 3.47E-05 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 1.73E-05 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 3.69E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 5.83E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 1.71E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 5.83E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 2.11E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 3.16E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 5.68E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 3.16E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 3.16E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 4.66E-07 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 6.39E-05 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 1.17E-06 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 6.39E-05 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 1.00E-03 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 7.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 2.24E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 2.24E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 7.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 1.00E-03 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

112 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 6.26E-06 lbs/tmm EAF-5- fugitive tmm/yr 6.89E-05 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 9.55E-07 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 9.55E-06 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 7.52E-05 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 2.00E-05 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 2.22E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/ton sand No data U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 1.00E-03 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Cobalt Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

113

114 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Arsenic Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 3.48E-05 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 2.73E-05 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 7.50E-06 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 3.25E-05 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 1.63E-05 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.84E-05 lbs/tmp Average all PM source tests adjusted for metals content Doghouse cooling-griffin- Fugitive 0 tmp/yr 2.91E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse shakeout-fuller- Stack 0 tmp/yr 8.55E-06 lbs/tmp Average all PM source tests adjusted for metals content Doghouse shakeout-fuller- Fugitive 0 tmp/yr 2.91E-05 lbs/tmp AP42 Table adjusted for capture & metals content Doghouse Pouring- Fugitive 0 tmp/yr 1.05E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 1.58E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 2.84E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture, control & metals content V-Bay P/C- Fugitive 1945 tmp/yr 1.58E-05 lbs/tmp AP-42 Table , 1995 adjusted for capture & metals content Chain Floor P/C- Fugitive 275 tmp/yr 1.58E-04 lbs/tmp AP-42 Table , 1995 adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 2.33E-07 lbs/tmp Average all source tests adjusted for metals content Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 3.20E-05 lbs/tmp AP42 Table adjusted for capture & metals content V-Bay Shakeout- Stack 1945 tmp/yr 5.83E-07 lbs/tmp Main floor ST adjusted for capture, control & metals content V-Bay Shakeout- Fugitive 1945 tmp/yr 3.20E-05 lbs/tmp AP42 Table adjusted for capture & metals content MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 1.60E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 5.12E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 5.12E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 1.60E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

115 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 1.31E-05 lbs/tmm EAF-5- fugitive tmm/yr 1.44E-04 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 1.99E-06 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 1.99E-05 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 1.57E-04 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.00E-05 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 1.11E-05 lbs/tmp AP42 Table adjusted for capture & metal content U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/ton sand Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Arsenic Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

116

117 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Antimony Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 9.53E-06 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 7.47E-06 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 2.00E-06 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 8.67E-06 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 4.33E-06 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse cooling-griffin- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse Pouring- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Chain Floor P/C- Fugitive 275 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 4.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 1.28E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 1.28E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 4.00E-06 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG

118 Facility-wide Natural Gas Usage 118 mmcf/yr 0.00E+00 lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 1.39E-06 lbs/tmm EAF-5- fugitive tmm/yr 1.53E-05 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 2.12E-07 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 2.12E-06 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 1.67E-05 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF source tests U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/ton sand No data U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 0 lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Antimony Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

119

120 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Selenium Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors Emission Factor Reference Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) EAF-1 and EAF-2- stack 6316 tmm/yr 6.40E-05 lbs/tmm Average all source tests since 2005 rebagging EAF-1 and EAF-2- fugitive 6316 tmm/yr 5.02E-05 lbs/tmm EAF factor, AP42 Table adjusted for capture & metal content AOD-8- stack 5981 tmp/yr 6.20E-05 lbs/tmp Average all source tests AOD-8- fugitive 5981 tmp/yr 2.69E-04 lbs/tmp EAF factor, AP42 Table adjusted for capture & metal content Ladle dump back- fugitive 6316 tmm/yr 1.34E-04 lb/tmm Assume 50% of AOD fugitives MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse cooling-griffin- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Stack 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse shakeout-fuller- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Doghouse Pouring- Fugitive 0 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay P/C- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Chain Floor P/C- Fugitive 275 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Stack 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests V-Bay Shakeout- Fugitive 1945 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF and AOD source tests MU - 2 PCS TOTAL 0.00 MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB Sand-Shot Blast- stacks 6316 tmm/yr lbs/tmm MU-4 S/SB TOTAL 0.00 MU-5 C/G Grinding- with control 5684 tmm/yr lbs/tmm Grinding- no control 632 tmm/yr lbs/tmm Carpentry shop 0.00E+00 MU-5 C/G TOTAL 0.00 MU-6 HOTWORK Chain table welding- fugitive 408 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table Upper finishing- air arc & welding- stack 454 tmp/yr 3.60E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Upper finishing- burning- stack 0 tmp/yr 1.15E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing- burning- stack 4538 tmp/yr 1.15E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-air arc-uncontrolled- stack 4538 tmp/yr 3.60E-05 lbs/tm assumed PM emission times metal content of EAF baghouse dust Lower finishing-welding- stack lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00

121 MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 0.00E+00 lbs/mmcf EPA AP42 Section Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT EAF-5- stack tmm/yr 3.27E-05 lbs/tmm EAF-5- fugitive tmm/yr 3.60E-04 lbs/tmm Average all source tests since 2007 new baghouse AP42 Table adjusted for capture & metal content INDF-3- stack 185 tmm/yr 4.99E-06 lbs/tmm AP-42 Table adjusted for 90% control & metal content INDF-4- fugitive 0 tmm/yr 4.99E-05 lbs/tmm AP-42 Table adjusted for metal content AOD-Res- stack 0 tmp/yr 3.93E-04 lbs/tmp EAF emission factor U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 0.00E+00 lbs/tmp below detection level in EAF source tests U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/ton sand No data U-3-MH/SR TOTAL U-4 S/SB Sand-Shot Blast- stacks 3312 tmm/yr lbs/tmm U-4 S/SB TOTAL U-5 C/G Grinding- stack 3312 tmm/yr lbs/tmm U-5 C/G TOTAL U-6 HOTWORK Welding- stack 2042 lb rod/yr 0.00E+00 lb/1000 lb AP-42 Table U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 0.00E+00 lbs/mmcf EPA AP42 Section Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Metals content calculated from metals in source tests divided by PM in source tests. Total Facility Se Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

122

123 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Phenol Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 4.20E-02 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 1.40E-02 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 2.70E-02 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 9.00E-03 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 9.20E-02 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 9.20E-02 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 8.28E-02 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 9.20E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 3.68E-01 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 1.80E-02 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 1.80E-02 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Stack 1945 tmp/yr 1.80E-02 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 1.80E-02 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.33 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 0.00E+00 lb/tmp Form R Reporting, AFS Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 0.00E+00 lb/tmp Form R Reporting, AFS Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.00 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 0.00E+00 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 0 lbs/mmcf Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.86E-01 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 9.78E-03 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 3.00E-04 lb/tmp Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL 0.00

124 3U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 1.08E+01 lb/ton resin avg. source test Core and Mold Making- vent 262 ton resin/yr 5.76E+00 lb/ton resin one source test x Core and Mold Making- fugitive 262 ton resin/yr 6.40E-01 lb/ton resin Source test adjusted for capture U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 0.00E+00 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 0.00E+00 lbs/mmcf Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Phenol Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

125 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Formaldehyde Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 4.00E-03 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 1.33E-03 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 1.17E-03 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 3.88E-04 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 6.89E-03 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 6.89E-03 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 6.20E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 6.89E-04 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 2.75E-02 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 7.77E-04 lbs/tmp Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 7.77E-04 lbs/tmp V-Bay Shakeout- Stack 1945 tmp/yr 7.77E-04 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Assumed same as doghouse fuller source test adjusted for capture Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 7.77E-04 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.02 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 8.50E-04 lb/tmp Form R Reporting, AFS Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 8.50E-04 lb/tmp Form R Reporting, AFS Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.00 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 0.00E+00 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL 0.00

126 3U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.20E-02 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 6.32E-04 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 2.28E-04 lb/tmp Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 2.04E-01 lb/ton resin avg. source test Core and Mold Making- vent 262 ton resin/yr 9.68E+00 lb/ton resin avg. source test x Core and Mold Making- fugitive 262 ton resin/yr 1.08E+00 lb/ton resin Source test adjusted for capture U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 3.00E-03 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 7.50E-02 lbs/mmcf EPA AP Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Formaldehyde Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

127 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Benzene Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 2.80E-02 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 9.33E-03 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 1.20E-02 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 4.00E-03 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 5.33E-02 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 5.33E-02 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 4.80E-02 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 5.33E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 2.13E-01 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 8.00E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 8.00E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Stack 1945 tmp/yr 8.00E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 8.00E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.18 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 0.00E+00 lb/tmp Form R Reporting, AFS Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 0.00E+00 lb/tmp Form R Reporting, AFS Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.00 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 0.00E+00 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING All dip painting 6316 tmm/yr 0.00E+00 lb/tmm Material balance MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr lbs/mmcf EPA AP Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 6.45E-02 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 3.39E-03 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 9.43E-05 lb/tmp Pacific Steel source test U-3-MH/SR TOTAL U-4 S/SB

128 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 3.10E-03 lb/ton resin Pacific Steel source test Core and Mold Making- vent 262 ton resin/yr 2.50E-03 lb/ton resin Pacific Steel source test Core and Mold Making- fugitive 262 ton resin/yr 6.20E-04 lb/ton resin Pacific Steel source test U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 0.00E+00 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 2.10E-03 lbs/mmcf EPA AP Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Benzene Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

129 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Cresol Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 2.60E-02 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 8.67E-03 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 1.40E-02 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 4.67E-03 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 5.33E-02 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 5.33E-02 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 4.80E-02 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 5.33E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 2.13E-01 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 9.33E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 9.33E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Stack 1945 tmp/yr 9.33E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 9.33E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.19 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.00 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 0.00E+00 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 0 lbs/mmcf EPA AP Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 1.08E-01 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 5.67E-03 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/tmp U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL 0.00

130 3U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge Core and Mold Making- vent 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge Core and Mold Making- fugitive 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 0.00E+00 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 0.00E+00 lbs/mmcf EPA AP Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Cresol Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

131 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Toluene Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.43E-02 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 4.78E-03 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 5.33E-03 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 1.78E-03 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 2.62E-02 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 2.62E-02 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 2.36E-02 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 2.62E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 1.05E-01 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 3.56E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 3.56E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Stack 1945 tmp/yr 3.56E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 3.56E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.09 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.00 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 8.95E-03 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 3.40E-03 lbs/mmcf EPA AP Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 2.67E-02 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 1.40E-03 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/tmp U-3-MH/SR TOTAL U-4 S/SB

132 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge Core and Mold Making- vent 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge Core and Mold Making- fugitive 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 2.40E-03 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 3.40E-03 lbs/mmcf EPA AP Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Toluene Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive

133 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Naphthalene Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Calculated Process Emissions (lbs/yr) Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT MU - 1 MELT TOTAL 0.00 MU - 2 PCS Doghouse cooling-griffin- Stack 0 tmp/yr 1.40E-02 lbs/tmp Source test Doghouse cooling-griffin- Fugitive 0 tmp/yr 4.67E-03 lbs/tmp Source test adjusted for capture Doghouse shakeout-fuller- Stack 0 tmp/yr 1.47E-02 lbs/tmp Source test Doghouse shakeout-fuller- Fugitive 0 tmp/yr 4.89E-03 lbs/tmp Source test adjusted for capture Doghouse Pouring- Fugitive 0 tmp/yr 3.82E-02 lbs/tmp sum of Griffin + Fuller Main Floor and Slinger Bay P/C- Fugitive 2318 tmp/yr 3.82E-02 lbs/tmp sum of Griffin + Fuller V-Bay P/C- vacuum pump exhaust- Stack 1945 tmp/yr 3.44E-02 lbs/tmp sum of Griffin + Fuller adjusted for capture V-Bay P/C- Fugitive 1945 tmp/yr 3.82E-03 lbs/tmp sum of Griffin + Fuller adjusted for capture Chain Floor P/C- Fugitive 275 tmp/yr 1.53E-01 lbs/tmp sum of Griffin + Fuller times 2 for binder in molds Main Floor, Slinger, Chain Floor Shakeout-Stack 2593 tmp/yr 9.78E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture Main Floor, Slinger, Chain Floor Shakeout-Fugitive 2593 tmp/yr 9.78E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Stack 1945 tmp/yr 9.78E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture V-Bay Shakeout- Fugitive 1945 tmp/yr 9.78E-03 lbs/tmp Assumed same as doghouse fuller source test adjusted for capture MU - 2 PCS TOTAL 0.15 MU-3-MH/SR Sand reclaim and material handling-stack 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Doghouse sand reclamation (Griffin) 0 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE Core making- cold box, oil core, no-bake 4538 tmp/yr 1.30E-02 lb/tmp Form R Reporting, AFS Core & mold washes- upper room, lower room, slinger bay, main floor 4538 tmp/yr 0.00E+00 lb/tmp Process knowledge Chain floor core making- screw mixer- stack 275 tmp/yr 0.00E+00 lb/tmp Process knowledge MU-7 MOLD/CORE TOTAL 0.03 MU-8 VOC Miscellaneous VOC (no MU-9 coatings and no MU-7 washes) 6316 tmp/yr 0.00E+00 lb/tmp Material balance MU-8 VOC TOTAL MU-9 COATING MU-9 COATING TOTAL MU-10 NG Facility-wide Natural Gas Usage 118 mmcf/yr 6.10E-04 lbs/mmcf EPA AP Main Plant Total Main Plant Stack Main Plant Fugitive Plant 3 3U-1 MELT 3U-1 MELT TOTAL U-2 PCS Pouring, Cooling and Shakeout-stack 9538 tmp/yr 7.83E-03 lbs/tmp Average all source tests Pouring, Cooling and Shakeout-fugitive 9538 tmp/yr 4.12E-04 lbs/tmp adjusted for 95% capture U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6726 tons sand/yr 0.00E+00 lb/tmp U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL 0.00

134 3U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE Pug mill system- stack 262 ton resin/yr 0.00E+00 lb/ton resin Process knowledge Core and Mold Making- vent 262 tmp/yr 3.15E-03 lb/tmp AFS Form R reporting Core and Mold Making- fugitive 262 tmp/yr 3.50E-04 lb/tmp AFS Form R reporting U-7 MOLD/CORE TOTAL U-8 VOC Miscellaneous VOC tmm/yr 0.00E+00 lb/tmm Material Balance U-8 VOC TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage 49 mmcf/yr 6.10E-04 lbs/mmcf EPA AP Plant 3 Total Plant 3 Stack Plant 3 Fugitive NOTES: tmm = tons of metal melted, tmp = tons of metal poured mmcf = million cubic feet of natural gas Total Facility Naphthalene Emissions Main Plant + Plant 3 Total Main Plant + Plant 3 Stack Main Plant + Plant 3 Fugitive Form R Reporting of Binder Chemicals Used in Foundries; American Foundrymen's Society, Inc. and Casting Industry Suppliers Association, 2nd Ed., 1998.

135 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Triethylamine Diisocyanates Trimethylbenzene POMs (7) Main Plant Notes Units Factor Units Emission Factor Units Emission Factor Units Emission Factor Units Emission Doghouse PCS 1 0 tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr Main Floor, Slinger Bay PCS tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr Chain Floor PCS tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr V-Bay tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr Mold & Core Making tmp/yr lb/tmp 52.6 lb/yr lb/tmp 2.6 lb/yr lb/tmp 1.6 lb/yr 0 lb/tmp 0.0 lb/yr Misc. Chemicals tmp/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 1.82E-03 lb/tmp 8.3 lb/yr lb/tmp 0.0 lb/yr Natural Gas mm cf/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 5.18E-05 lb/mm cf lb/yr MP total 52.6 lb/yr 2.6 lb/yr 9.9 lb/yr 0.0 lb/yr Plant 3 PCS tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr Misc. Chemicals tmp/yr 0 lb/tmp 0.0 lb/yr lb/tmp* 3.7 lb/yr 1.95E-03 lb/tmp 18.6 lb/yr lb/tmp 0.0 lb/yr Natural Gas 5 49 mm cf/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 5.18E-05 lb/mm cf lb/yr P3 Total 0.0 lb/yr 3.7 lb/yr 18.6 lb/yr 0.0 lb/yr MP + P3 Total 52.6 lb/yr 6.3 lb/yr 28.5 lb/yr 0.01 lb/yr MP + P3 Total Remaining HAPs lb/yr * R&D castings using PUNB binders 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of stack and fugitive emissions. 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of stack and fugitive emissions. 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of stack and fugitive emissions. 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fugitive emissions. 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthalene and methylnaphthalene. 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than detection

136 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Main Plant Notes Units Doghouse PCS 1 0 tmp/yr Main Floor, Slinger Bay PCS tmp/yr Chain Floor PCS tmp/yr V-Bay tmp/yr Mold & Core Making tmp/yr Misc. Chemicals tmp/yr Natural Gas mm cf/yr MP total Plant 3 PCS tmp/yr Misc. Chemicals tmp/yr Natural Gas 5 49 mm cf/yr P3 Total Hexane Dichlorobenzene Acrolein Ethylbenzene Factor Units Emission Factor Units Emission Factor Units Emission Factor Units Emission lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 6.6 lb/yr lb/tmp 0.0 lb/yr lb/tmp 6.2 lb/yr lb/tmp 6.6 lb/yr lb/tmp 2.2 lb/yr lb/tmp 0.0 lb/yr lb/tmp 2.0 lb/yr lb/tmp 2.2 lb/yr lb/tmp 5.5 lb/yr lb/tmp 0.0 lb/yr lb/tmp 5.2 lb/yr lb/tmp 5.5 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 7.63E-06 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 1.82E-03 lb/tmp 8.3 lb/yr 1.8 lb/mm cf lb/yr 1.20E-03 lb/mm cf 0.1 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr lb/yr 0.1 lb/yr 13.4 lb/yr 22.6 lb/yr lb/tmp 10.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 22.0 lb/yr lb/tmp 17.5 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 1.95E-03 lb/tmp 18.6 lb/yr 1.8 lb/mm cf 87.8 lb/yr 1.20E-03 lb/mm cf 0.1 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 97.9 lb/yr 0.1 lb/yr 22.0 lb/yr 36.1 lb/yr MP + P3 Total lb/yr 0.2 lb/yr 35.4 lb/yr 58.7 lb/yr MP + P3 Total Remaining HAPs lb/yr 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of st 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of st 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of st 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fu 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthale 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than de

137 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Main Plant Notes Units Doghouse PCS 1 0 tmp/yr Main Floor, Slinger Bay PCS tmp/yr Chain Floor PCS tmp/yr V-Bay tmp/yr Mold & Core Making tmp/yr Misc. Chemicals tmp/yr Natural Gas mm cf/yr MP total Plant 3 PCS tmp/yr Misc. Chemicals tmp/yr Natural Gas 5 49 mm cf/yr P3 Total Xylenes Styrene Biphenyl MIBK Factor Units Emission Factor Units Emission Factor Units Emission Factor Units Emission lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 30.8 lb/yr lb/tmp 19.8 lb/yr lb/tmp 35.2 lb/yr lb/tmp 11.0 lb/yr lb/tmp 10.2 lb/yr lb/tmp 6.6 lb/yr lb/tmp 11.7 lb/yr lb/tmp 3.6 lb/yr lb/tmp 25.9 lb/yr lb/tmp 16.6 lb/yr lb/tmp 29.6 lb/yr lb/tmp 9.2 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 3.65E-03 lb/tmp 16.6 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr lb/mm cf 0.0 lb/yr 83.5 lb/yr 43.0 lb/yr 76.5 lb/yr 23.9 lb/yr lb/tmp lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr 3.90E-03 lb/tmp 37.2 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr lb/yr 0.0 lb/yr 0.0 lb/yr 0.0 lb/yr MP + P3 Total lb/yr 43.0 lb/yr 76.5 lb/yr 23.9 lb/yr MP + P3 Total Remaining HAPs lb/yr 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of st 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of st 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of st 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fu 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthale 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than de

138 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Main Plant Notes Units Doghouse PCS 1 0 tmp/yr Main Floor, Slinger Bay PCS tmp/yr Chain Floor PCS tmp/yr V-Bay tmp/yr Mold & Core Making tmp/yr Misc. Chemicals tmp/yr Natural Gas mm cf/yr MP total Plant 3 PCS tmp/yr Misc. Chemicals tmp/yr Natural Gas 5 49 mm cf/yr P3 Total Aniline Acetaldehyde Methylnaphthalene (8) Propionaldehyde (8) Factor Units Emission Factor Units Emission Factor Units Emission Factor Units Emission lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 39.6 lb/yr lb/tmp 79.3 lb/yr lb/tmp 78.5 lb/yr lb/tmp 1.8 lb/yr lb/tmp 13.1 lb/yr lb/tmp 26.2 lb/yr lb/tmp 9.3 lb/yr lb/tmp 0.2 lb/yr lb/tmp 33.3 lb/yr lb/tmp 66.5 lb/yr lb/tmp 65.9 lb/yr lb/tmp 1.5 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 86.0 lb/yr lb/yr lb/yr 3.6 lb/yr lb/tmp 20.0 lb/yr lb/tmp 23.7 lb/yr lb/tmp lb/yr lb/tmp 7.5 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 20.0 lb/yr 23.7 lb/yr lb/yr 7.5 lb/yr MP + P3 Total lb/yr lb/yr lb/yr 11.1 lb/yr MP + P3 Total Remaining HAPs lb/yr 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of st 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of st 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of st 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fu 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthale 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than de

139 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Main Plant Notes Units Doghouse PCS 1 0 tmp/yr Main Floor, Slinger Bay PCS tmp/yr Chain Floor PCS tmp/yr V-Bay tmp/yr Mold & Core Making tmp/yr Misc. Chemicals tmp/yr Natural Gas mm cf/yr MP total Plant 3 PCS tmp/yr Misc. Chemicals tmp/yr Natural Gas 5 49 mm cf/yr P3 Total Cyanide Compounds Dimethylaniline (8) Cumene (9) Tetrachloroethylene Factor Units Emission Factor Units Emission Factor Units Emission Factor Units Emission 0 lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr lb/tmp 12.2 lb/yr lb/tmp 6.6 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr lb/tmp 1.4 lb/yr lb/tmp 2.2 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr lb/tmp 10.2 lb/yr lb/tmp 5.5 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr lb/mm cf 0.0 lb/yr 0.0 lb/yr 23.8 lb/yr 14.3 lb/yr 0.0 lb/yr lb/tmp lb/yr lb/tmp 50.1 lb/yr lb/tmp 14.3 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr 2.03E-03 lb/tmp 19.4 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr 0 lb/mm cf 0.0 lb/yr lb/mm cf 0.0 lb/yr lb/yr 50.1 lb/yr 14.3 lb/yr 19.4 lb/yr MP + P3 Total lb/yr 73.9 lb/yr 28.6 lb/yr 19.4 lb/yr MP + P3 Total Remaining HAPs lb/yr 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of st 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of st 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of st 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fu 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthale 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than de

140 ESCO Corp: Main Plant and Plant 3 Remaining HAP Emissions Issue Date 3/1/2012 Compliance Dates: 01-Dec Nov-15 Production Main Plant Notes Units Doghouse PCS 1 0 tmp/yr Main Floor, Slinger Bay PCS tmp/yr Chain Floor PCS tmp/yr V-Bay tmp/yr Mold & Core Making tmp/yr Trichloroethylene Factor Units Emission lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr lb/tmp 0.0 lb/yr 0 lb/tmp 0.0 lb/yr Misc. Chemicals tmp/yr Natural Gas mm cf/yr MP total Plant 3 PCS tmp/yr Misc. Chemicals tmp/yr Natural Gas 5 49 mm cf/yr P3 Total 2.79E-02 lb/tmp lb/mm cf lb/tmp 1.12E-02 lb/tmp lb/mm cf lb/yr 0.0 lb/yr lb/yr 0.0 lb/yr lb/yr 0.0 lb/yr lb/yr MP + P3 Total lb/yr MP + P3 Total Remaining HAPs lb/yr 1.18 tons/yr Notes 1. Emission factor is 2.7 times Fuller and Griffin source tests to account for the sum of st 2. Emission factor is 1.9 times Fuller and Griffin source tests to account for the sum of st 3. Emission factor is 5.3 times Fuller and Griffin source tests to account for the sum of st 4. Emission factor based on 2009 material balance and/or AFS Form R guidance 5. Emission factor based on EPA AP-42, Section Emission factor is 1.05 times P3 PCS source test to account for the sum of stack and fu 7. POM is the sum of fluoranthene, fluorene, phenanthrene, pyrene. Excludes naphthale 8. Use P3 PCS source test for MP PCS 9. Use MP PCS source test for P3 PCS General: cells highlighted in yellow use 1/2 MRL from source tests for values less than de

141 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Greenhouse Gas CO2e Emissions PSEL 11/30/ Dec Nov-15 Issue Date 3/1/2012 Emission Unit ID Main Plant MU - 1 MELT Production Rate (yearly) Emission Factors EAF-1 and EAF tmm/yr 2.80E+02 lbs/tmm Emission Factor Reference Calculated Process Emissions (tons/yr) CO2: NETL 2010, Appendix A, Table Emission Unit totals (tons/yr) N2O: assume 20% of NOx EAF-1 and EAF tmm/yr 5.37E+01 lbs/tmm emission factor and 310 GWP AOD tmp/yr 2.80E+02 lbs/tmp CO2: assume same as EAF AOD tmp/yr 5.37E+01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP MU - 1 MELT TOTAL MU - 2 PCS Doghouse P/C/S - tmp/yr 1.00E+01 lbs/tmp CO2: AFS Paper (10), 2008, Table Doghouse P/C/S - tmp/yr 6.20E-01 lbs/tmp Main Floor and Slinger Bay P/C/S 2, tmp/yr 1.00E+01 lbs/tmp Main Floor and Slinger Bay P/C/S 2, tmp/yr 6.20E-01 lbs/tmp V-Bay P/C/S 1, tmp/yr 1.00E+01 lbs/tmp V-Bay P/C/S 1, tmp/yr 6.20E-01 lbs/tmp Chain Floor P/C/S tmp/yr 1.00E+01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP 0.00 CO2: AFS Paper (10), 2008, Table N2O: assume 20% of NOx emission factor and 310 GWP 0.72 CO2: AFS Paper (10), 2008, Table N2O: assume 20% of NOx emission factor and 310 GWP 0.60 CO2: AFS Paper (10), 2008, Table Chain Floor P/C/S tmp/yr 6.20E-01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP 0.09 MU - 2 PCS TOTAL MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage mmcf/yr 1.20E+05 lb/mmcf CO2 EPA factor: 117 lb/mm Btu and 1028 Btu/scf Facility-wide Natural Gas Usage mmcf/yr 7.03E+01 lb/mmcf N20 EPA factor: lb/mm Btu and GWP Facility-wide Natural Gas Usage mmcf/yr 4.76E+01 lbs/mmcf CH4 EPA factor: lb/mm Btu and GWP Main Plant Total 9,167.0

142 Plant 3 3U-1 MELT EAF tmm/yr 2.80E+02 lbs/tmm CO2: NETL 2010, Appendix A, Table N2O: assume 20% of NOx EAF tmm/yr 1.33E+02 lbs/tmm emission factor and 310 GWP INDF-3& tmm/yr 2.80E+02 lbs/tmm CO2: assume same as EAF 6.83 N2O: assume 20% of NOx INDF-3& tmm/yr 5.37E+01 lbs/tmm emission factor and 310 GWP 1.31 AOD-Res 0 tmp/yr 2.80E+02 lbs/tmp CO2: assume same as EAF 0.00 AOD-Res 0 tmp/yr 5.37E+01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP U-1 MELT TOTAL U-2 PCS Pouring, Cooling, Shakeout 9538 tmp/yr 7.00E+01 lbs/tmp CO2: AFS Paper (10), 2008, Table Pouring, Cooling, Shakeout 9538 tmp/yr 6.20E-01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 6,726 tons sand/yr 9.80E+00 lb/ton sand CO2: assume 100 times CO factor Thermal Sand Reclaim- stack 6,726 tons sand/yr 2.14E+01 lb/ton sand N2O: assume 20% of NOx emission factor and 310 GWP U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage mmcf/yr 1.20E+05 lb/mmcf CO2 EPA factor: 117 lb/mm Btu and 1028 Btu/scf Facility-wide Natural Gas Usage mmcf/yr 7.03E+01 lb/mmcf N20 EPA factor: lb/mm Btu and GWP Facility-wide Natural Gas Usage mmcf/yr 4.76E+01 lbs/mmcf CH4 EPA factor: lb/mm Btu and GWP Plant 3 Total 5,627.2 Total Facility CO2e Emissions Main Plant + Plant 3 Total 14,794

143 ESCO Corp: Main Plant and Plant 3 Compliance Dates: Greenhouse Gas CO2e Emissions Baseline 01-Dec Nov-15 Issue Date 3/1/2012 Baseline year = 2007 Calculated Process Emissions (tons/yr) Emission Unit totals (tons/yr) Emission Unit ID Production Rate (yearly) Emission Factors Emission Factor Reference Main Plant MU - 1 MELT CO2: NETL 2010, Appendix EAF-1 and EAF tmm/yr 2.80E+02 lbs/tmm A, Table N2O: assume 20% of NOx emission factor and 310 EAF-1 and EAF tmm/yr 5.37E+01 lbs/tmm GWP AOD tmp/yr 2.80E+02 lbs/tmp CO2: assume same as EAF N2O: assume 20% of NOx emission factor and 310 AOD tmp/yr 5.37E+01 lbs/tmp GWP MU - 1 MELT TOTAL MU - 2 PCS CO2: AFS Paper (10), Doghouse P/C/S tmp/yr 1.00E+01 lbs/tmp 2008, Table Doghouse P/C/S tmp/yr 6.20E-01 lbs/tmp Main Floor and Slinger Bay P/C/S 4728 tmp/yr 1.00E+01 lbs/tmp Main Floor and Slinger Bay P/C/S 4728 tmp/yr 6.20E-01 lbs/tmp V-Bay P/C/S 3377 tmp/yr 1.00E+01 lbs/tmp V-Bay P/C/S 3377 tmp/yr 6.20E-01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP 4.33 CO2: AFS Paper (10), 2008, Table N2O: assume 20% of NOx emission factor and 310 GWP 1.47 CO2: AFS Paper (10), 2008, Table N2O: assume 20% of NOx emission factor and 310 GWP 1.05 Chain Floor P/C/S 450 tmp/yr 1.00E+01 lbs/tmp CO2: AFS Paper (10), 2008, Table Chain Floor P/C/S 450 tmp/yr 6.20E-01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP 0.14 MU - 2 PCS TOTAL MU-3-MH/SR MU-3-MH/SR TOTAL 0.00 MU-4 S/SB MU-4 S/SB TOTAL 0.00 MU-5 C/G MU-5 C/G TOTAL 0.00 MU-6 HOTWORK MU-6 HOTWORK TOTAL 0.00 MU-7 MOLD/CORE MU-7 MOLD/CORE TOTAL 0.00 MU-10 NG Facility-wide Natural Gas Usage mmcf/yr 1.20E+05 lb/mmcf Facility-wide Natural Gas Usage mmcf/yr 7.03E+01 lb/mmcf Facility-wide Natural Gas Usage mmcf/yr 4.76E+01 lbs/mmcf CO2 EPA factor: 117 lb/mm Btu and 1028 Btu/scf N20 EPA factor: lb/mm Btu and GWP CH4 EPA factor: lb/mm Btu and GWP Main Plant Total 15,840.0

144 Plant 3 3U-1 MELT EAF tmm/yr 2.80E+02 lbs/tmm CO2: NETL 2010, Appendix A, Table EAF tmm/yr 1.33E+02 lbs/tmm N2O: assume 20% of NOx emission factor and 310 GWP INDF-3&4 342 tmm/yr 2.80E+02 lbs/tmm CO2: assume same as EAF INDF-3&4 342 tmm/yr 5.37E+01 lbs/tmm N2O: assume 20% of NOx emission factor and 310 GWP 9.19 AOD-Res 0 tmp/yr 2.80E+02 lbs/tmp CO2: assume same as EAF 0.00 AOD-Res 0 tmp/yr 5.37E+01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP U-1 MELT TOTAL U-2 PCS Pouring, Cooling, Shakeout tmp/yr 7.00E+01 lbs/tmp CO2: AFS Paper (10), 2008, Table Pouring, Cooling, Shakeout tmp/yr 6.20E-01 lbs/tmp N2O: assume 20% of NOx emission factor and 310 GWP U-2 PCS TOTAL U-3-MH/SR Thermal Sand Reclaim- stack 12,304 tons sand/yr 9.80E+00 lb/ton sand CO2: assume 100 times CO factor Thermal Sand Reclaim- stack 12,304 tons sand/yr 2.14E+01 lb/ton sand N2O: assume 20% of NOx emission factor and 310 GWP U-3-MH/SR TOTAL U-4 S/SB 3U-4 S/SB TOTAL U-5 C/G 3U-5 C/G TOTAL U-6 HOTWORK 3U-6 HOTWORK TOTAL U-7 MOLD/CORE 3U-7 MOLD/CORE TOTAL U-9 COATING 3U-9 COATING TOTAL U-10 NG Facility-wide Natural Gas Usage mmcf/yr 1.20E+05 lb/mmcf Facility-wide Natural Gas Usage mmcf/yr 7.03E+01 lb/mmcf Facility-wide Natural Gas Usage mmcf/yr 4.76E+01 lbs/mmcf CO2 EPA factor: 117 lb/mm Btu and 1028 Btu/scf N20 EPA factor: lb/mm Btu and GWP CH4 EPA factor: lb/mm Btu and GWP Plant 3 Total 9,986.3 Total Facility CO2e Emissions Main Plant + Plant 3 Total 25,826

145 ESCO Corporation Title V Permit, No Annual Report Summary of Pressure Drop and Bag Leak Detection Excursions

146 ESCO Corporation Summary of Pressure Drop and Bag Leak Detection Excursions - January 1 through December 31, 2015 On Date On Time Off Date Off Time Duration Alarm Description Comment 1/18/2015 9:49:39 PM 1/18/ :09:45 PM 1:20:06 MP EAF Cell 7 DP Low-Low ( 3.5 ) Alarm self corrected, no corrective action needed 1/18/2015 8:02:22 PM 1/18/2015 9:31:29 PM 1:29:07 MP EAF Cell 7 DP Low-Low ( 3.5 ) Alarm self corrected, no corrective action needed 4/9/2015 2:09:59 AM 4/9/2015 3:41:42 AM 1:31:43 P3 EAF North Cell 1 DP Low-Low ( 0.0 ) 6/3/2015 2:49:39 AM 6/3/2015 3:49:51 AM 1:00:12 P3 EAF North Cell 1 DP Low-Low ( 0.0 in WC) Furnace was not running, false alarm - no corrective actions needed Furnace was not running, false alarm - no corrective actions needed 6/4/2015 2:14:09 AM 6/4/2015 3:40:08 AM 1:25:59 P3 EAF North Cell 1 DP Low-Low ( 0.0 in WC) Furnace was not running, false alarm - no corrective actions needed 9/10/2015 8:54:12 AM 9/10/2015 8:54:14 AM 0:00:02 MP MP EAF Cell 10 DP Low-Low - Alarm Alarm self corrected, no corrective action needed 10/19/2015 2:17:15 AM 10/20/2015 8:42:48 AM 6:25:33 MP EAF Cell 6 DP Low-Low ( 0.1 ) Electrical Issue - reporting DP even when fan was off - Resolved 10/20/ :59:57 AM 10/20/ :00:08 AM 0:00:11 MF Shakeout Cell 1 DP Low-Low ( 0.0 ) Alarm self corrected, no corrective action needed 12/3/ :00:00 AM 12/3/ :00:00 PM 1:00:00 P3 Mold Pug mill 1 DP Low-Low (1.0) Completing cleanout cycle at time of reading, no corrective actions needed.

147 ESCO Corporation Title V Permit, No Annual Report Progress Update on the Best Work Practices Agreement

148 Progress Update on the Good Neighbor Agreement - Attachment A Items Best Work Practices Agreement, Conditions 49-65, Title V Air Permit # Prepared: January 22, 2016 Item 1 Complete. Two dust collectors were installed to improve capture and control of Doghouse Pouring-Cooling-Shakeout emissions. The collectors were tested in January 2014, and dust was weighed and correlated to tons of metal poured in the Doghouse. Because Plant 2/Doghouse operations shut down on November 12, 2014, these dust collectors are no longer in service. Item 2 Complete. The Main Plant, Lower Finishing Area (LFA) Bay-1 Air Arc Cutting emissions were routed to the existing Bay-2 Powder Burn dust collector (301260); this was completed March 7, Installation of an additional dust collector, the LFA Bay-2 Air Arc dust collector (301120), was completed August 12, As the method of confirmation, the Bay-2 Air Arc dust collector dust was weighed for six consecutive months, averaging pounds of dust collected per month of operation. Item 3 Complete. The Main Plant, Upper Finishing Area (UFA) chain table filtration unit is functioning. For the method of confirmation, one month of data was collected, totaling 4.4 pounds of dust. Item 4 Complete. In the Plant 3 cooling room, pouring and shakeout areas, we increased our inspection frequency by ESCO maintenance personnel to semi-annually in an effort to reduce potential fugitive emissions. The cooling room enclosure is also inspected monthly by ESCO staff. Item 5 Complete. In July 2013, Plant 3 converted to a lower phenol binder system. This system was tested in August 2013, and the calculated reduction of emissions per the method specified in the permit was 70.5%. The permit requirement of at least a 35-40% reduction has been met. Item 6 The Main Plant Chain Room switched to the Pep Set Quantum line of binder and catalyst. There is a slight increase in Volatile Organic Compounds (VOCs) during molding, but a significant decrease in Hazardous Air Pollutants (HAPs) from the molding, pouring, cooling and shakeout processes. Item 7 Complete. We have installed bag leak detection probes. The Main Plant Electric Arc Furnace (EAF) dust collector, AOD dust collector, Plant 3 EAF dust collectors and Plant 3 Pouring- Cooling-Shakeout dust collector all have probes installed and operational. The alarm settings and response procedures have been added to the Air Emission Control Device Operating Plan. Item 8 Complete. ESCO modified its Overhead Door Plan to better address issues associated with capture at the EAFs and AOD process. Item 9 World Headquarters 2141 NW 25 th Avenue Portland, Oregon Phone: Fax: