May 9, 2012 

Attn: Compliance Tracker, AE-17J 

Air Enforcement and Compliance Assurance Branch 

U.S. Environmental Protection Agency 

Region 5 

77 West Jackson Boulevard 

Chicago, IL 60604 

Re: Request to Provide Information Pursuant to the Clean Air Act

On April 18, 2012, Barr Engineering Company received your Request to Provide Information Pursuant to 

the Clean Air Act; the requested information is regarding the the Minnesota taconite iron ore mining and 

pellet manufacturing industry. 

Barr Engineering Company completed Best Available Retrofit Technology (BART) analyses for the 

following Minnesota facilities: 

 U.S. Steel Corporation’s Keewatin Taconite Operations (Keetac) 

 U.S. Steel Corporation’s Minnesota Ore Operations (Minntac) 

 Northshore Mining Company (NMC) 

 Hibbing Taconite Company (Hibbtac) 

 United Taconite (Utac) 

 Mittal Steel USA – Minorca Mine (Mittal Steel) 

The enclosed compact disk, labeled “Barr Engineering Company, Disk 1 of 1 for Information Request 

Response, May 10, 2012” includes the following files: 

TABLE OF CONTENTS 

Description Filename 

Cover/TOC/Certification Letter (electronic copy of this letter) Cover Letter and TOC.pdf 

Screen Print of Anti-Virus Scan Results Antivirus Scan.pdf 

Question 1 through 5 Response Response 1 through 5.pdf 

Attachments to Question 1 through 5 Response

Attachment A – Summary of Relevant Economic Feasibility 

Control Costs 

Att A Cost Threshold Response 1.pdf 

Attachment B – Annualized Pollution Control Cost Basis - 

Keetac 

Att B Keetac Cost Response 2.pdf 

Attachment C – Annualized Pollution Control Cost Basis – 

Minntac 

Att C Minntac Cost Response 2.pdf 
Compliance Tracker, AE-17J, USEPA 

May 9, 2012 

Page 2 

Description Filename 

Attachment D – Annualized Pollution Control Cost Basis – 

North Shore Mining 

Att D NMC Cost Response 2.pdf 

Attachment E – Annualized Pollution Control Cost Basis – 

Hibbtac 

Att E Hibbtac Cost Response 2.pdf 

Attachment F – Annualized Pollution Control Cost Basis - Utac Att F Utac Cost Response 2.pdf 

Attachment G – Annualized Pollution Control Cost Basis – 

Mittal Steel 

Att G Mittal Cost Response 2.pdf 

Enclosures Referenced in Question 5 Response

Application for a Permit to Construct and Operate an Integrated 

Steel Plant, Volume II, Appendix C Best Available Control 

Technology Review, Prepared for Minnesota Steel Industries, 

LLC, May 2007 

MSI BACT Report Response 5.pdf 

Best Available Control Technology Analysis, Prepared for 

Essar Steel Minnesota LLC, October 2011 

Essar BACT Response 5.pdf 

Air Emissions Permit Application for the Furnace 5 

Reactivation Project, Volume I, BACT Analysis, Prepared for 

Northshore Mining Company, May 2, 2005 

NMC Furnace 5 Restart Vol I BACT 

Response 5.pdf 

NOx Reduction Technology Evaluation and Mitigation, 

Proposal for Keetac Expansion, February 10, 2010 

Keetac NOx Technology Evaluation 

Response 5.pdf 

I certify under penalty of law that I have examined and am familiar with the information in the enclosed 

documents, including all attachments. Based on my inquiry of those individuals with primary 

responsibility for obtaining the information, I certify that the statements and information are, to the best of 

my knowledge and belief, true and complete. I am aware that there are significant penalties for knowingly 

submitting false statements and information, including the possibility of fines or imprisonment pursuant 

to Section 113(c)(2) of the Act, and 18 U.S.C §§1001 and 1341. 

We are not asserting a claim of business confidentiality for any portion of the submitted information. 

I further certify that the compact disks have been scanned using Microsoft Forefront Anti Virus software. 

A screen print of the scan results is included on the compact disc. 

If you have questions regarding this response, please contact Chandler Taylor at 952-832-2621 or 

ctaylor@barr.com. 

Sincerely, 

Tim Russel 

Vice President 

Barr Engineering Company