From: George Pruchnofski

To: Beth Havlik; Aagenes, Jason D.

Cc: Paul Taylor; Erik Boleman

Subject: RE: Comments on UTAC scrubber cost estimate

Date: Tuesday, July 24, 2007 7:32:10 PM

Thanks Beth.

In addition, the BART guidance and the August 2006 USEPA Response to

Additional Regional Haze Questions refers directly to the OAQPS cost

manual and to the New Source Review Draft manual (Oct. 1990)and no other

documents. Therefore, I believe that MPCA was just winging it in their

response to Jason.

-----Original Message-----

From: Beth Havlik

Sent: Tuesday, July 24, 2007 6:17 PM

To: 'Aagenes, Jason D.'

Cc: Paul Taylor; Erik Boleman; Beth Havlik; George Pruchnofski

Subject: RE: Comments on UTAC scrubber cost estimate

Jason,

I bellieve we have developed some good substantiation based in EPA

Guidance that lost production costs are legitimate costs to include in a

BACT analysis. We're working on the other points, and hope to provide a

more complete response sometime tomorrow. For now, we wanted to update

you on our points regarding lost production.

Cost of Lost Production

MPCA has cited unsubstantiated EPA guidance that indicates that lost

production should not be included in a BACT analysis. The OAQPS Control

Cost Manual has been the most commonly referenced BACT guidance and

been in use for the past 25 years. Chapter 2 of the Manual is dedicated

to the concepts and methodology for estimating the cost of installing

air pollution controls. Several pages are dedicated to the cost

considerations if a retrofit is required. According to the Manual, "The

net revenue (i.e., gross revenue minus the direct costs of generating

it) lost during this unanticipated shutdown period is a bonafide

retrofit expense." [USEPA, OAQPS, EPA Air Pollution Control Cost Manual,

Sixth Edition, EPA/452/B-02--001, January 2002. Page 2-30.]

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-----Original Message-----

From: Aagenes, Jason D. [mailto:JDAagenes@cleveland-cliffs.com]

Sent: Monday, July 23, 2007 02:49 PM Central Standard Time

To: Beth Havlik

Cc: Paul Taylor; Erik Boleman; George Pruchnofski

Subject: FW: Comments on UTAC scrubber cost estimate

Beth,

Have you had a chance to review Anne Jackson's comments below? (The

first section after each bullet is my question, the following paragraph

is her response.) I'm especially troubled by the comments that MPCA

will not include lost production time and that particulate removal is

sufficient water treatment for blowdown water. I've included my

original email comments to Mary Jean and a copy of the STS report.

Thanks,

Jason
-----Original Message-----

From: Aagenes, Jason D.

Sent: Friday, July 13, 2007 12:32 PM

To: 'Beth Havlik'; 'George Pruchnofski'

Subject: FW: Comments on UTAC scrubber cost estimate

Please review and comment.

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-----Original Message-----

From: Jackson, Anne [mailto:Anne.Jackson@state.mn.us]

Sent: Friday, July 13, 2007 12:21 PM Eastern Standard Time

To: Aagenes, Jason D.

Cc: Fenske, Mary Jean

Subject: Comments on UTAC scrubber cost estimate

Jason, Mary Jean asked me to finish up the cost estimate for this

project. I am in the process of doing that, but thought I should try to

answer your questions directly. I don't see a "natural" place to

address these questions in the cost writeup documentation, so I'm

replying in this email.

These are the comments Mary Jean passed on to me and Hal Taylor:

1) Since the proposed project is a major modification to the

process and building, significant process downtime would be anticipated.

Please include the economic cost of lost production on Line 2 during

construction.

In the conduct of BACT analyses, EPA guidance directs BACT preparers to

not include lost production time in the development of capital cost

estimates for retrofit projects. Because we are preparing and
comparing pollution control alternatives in the same manner as a BACT

analysis, lost production costs will not be included in this estimate.

2) Verify that complete water treatment costs for removal of

fluorides, sulfates, etc. are included (capital, O&M) for blowdown

water. I'm concerned that, over time, untreated blowdown water

reporting to the tailings basin would significantly deteriorate our

process water quality.

I spoke to John Engesser about the need for additional blowdown water

treatment. John reports that as long as the water in the scrubber

recirculation system is treated with lime, it will be removing sulfates

and fluorides which will be landfilled with the solids and not represent

a tailing pond water problem. Chlorides will continue to build, but

would take several decades to reach levels of concern (and still be

below drinking water standards).

No additional units are included in the cost estimate for water

treatment.

3) Verify that proper sized process air fans are included in the

design as well as increased electrical demand. A critical component of

maintaining production is ensuring that sufficient air remains available

to the grate/kiln. With an increased pressure drop expected for this

type of scrubber, the process air fans and motors may need to be

upgraded.

The cost proposal includes two new ID fans and motors, and are assumed

to be properly sized. Power use is included in the annual costs.

Anne M. Jackson, P.E.
Minnesota Pollution Control Agency

ph: (651) 296-7949

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