**From:** Telander.Jeff@epamail.epa.gov [mailto:Telander.Jeff@epamail.epa.gov]

**Sent:** Tuesday, November 30, 2010 12:35 PM **To:** Reeves, David; Marinshaw, Richard **Subject:** Fw: Response of USG Interiors, Inc. to the EPA's Information CollectionRequest, Residual Risk Investigation for the NESHAP for Mineral WoolManufacturing Jeff Telander Sector Policies and Programs Division Office of Air Quality Planning and Standards (D243-02) RTP, NC 27711 919 - 541 -5427 919 - 541 -5450 (FAX) Overnight mail address: US EPA Mail Code D243-02 109 TWAlexander Drive RTP, NC 27709

----- Forwarded by Jeff Telander/RTP/USEPA/US on 11/30/2010 12:34 P M ----- From: "Bolden, John" <JBolden@usg.com > To: Jeff Telander/RTP/USEPA/US@EPA Cc: Bill Neuffer/RTP/USEPA/US@EPA, "Hill, Mike" < MHill@usg.com >, Peter Tsirig otis/RTP/USEPA/US@EPA, "Curry, Scott" < scurry@usg.com > Date: 11/30/2010 12:31 PM Subject: RE: Response of USG Interiors, Inc. to the EPA's Information CollectionRequest , Residual Risk Investigation for the NESHAP for Mineral WoolManufacturing

Mr. Telander, After sending the response to the EPA’s Information Collection Request (“ICR”), we realized that two fields needed to be revised for USG Interiors' Walworth Pl ant. The following cells have been revised for this Plant only on worksheet C4:

- Filter surface area (ft2)

- Continuous monitoring method(s) used to monitor performance, including parameters monitored The filter surface area was u nderestimated as the area of only one bag was included in the original spreadsheet. A "broken bag detector" was added to the continuous monitoring methods section. As these areas of the ICR were not considered confidential business information, please also make these corrections on the CBI version of the spreadsheet which was sent via standard mail to Mr. Robert Morales on 11/17/10. We apologize for any inconvenience this may have caused. Please feel free to give me a call if you have any questions. Thank y ou. Regards, John BoldenEnvironmental Services Senior Manager

United States Gypsum Company 550 W Adams St Chicago IL, 60661 Ph: 312 - 436 - 5587 Fax: 312 - 672 - 5587 Cell: 312 - 823 - 6702

----- Original Message ----- From: Telander.Jeff@epamail.epa.gov [ mailto:Telander.Jeff@epamail.epa.gov ] Sent: Wednesday, November 17, 2010 4:06 PM To: Bolden, John Cc: Neuffer.Bill@epamail.epa.gov ; Hill, Mike; Tsirigotis.Peter@epamail.epa.gov ; Curry, Scott Subject: Re: Response of USG Interiors, Inc. to the EPA's Information CollectionRequest, Residual Risk Investigat ion for the NESHAP for Mineral WoolManufacturing Dear Mr. Bolden, Your email message with attachments was received A - OK. Thank you very much for providing this information. I will give you a call if we have any questions. Sincerely, Jeff Telander

Jeff Telander Sector Policies and Programs Division Office of Air Quality Planning and Standards (D243 - 02) RTP, NC 27711 919 - 541 - 5427 919 - 541 - 5450 (FAX) Overnight mail address: US EPA Mail Code D243 - 02 109 TW Alexander Drive RTP, NC 27709

From: "Bolden, John" < JBolden@usg.com> To: Peter Tsirigotis/RTP/USEPA/US@EPA Cc: Jeff Telander/RTP/USEPA/US@EPA, Bill

Neuffer/RTP/USEPA/US@EPA, "Hill, Mike" < MHill@usg.com>, "Curry, Scott" < scurry@usg.com> Date: 11/17/2010 04:05 PMSubject: Response of USG Interiors, Inc. to the EPA's

Information Collection Request, Residual Risk Investigation for the

NESHAP for Mineral Wool Manufacturing Dear Mr. Tsirigotis: Consistent with the North American Insulation Manufacturers Association (“NAIMA”) discussions with the Environmental Protect ion Agency (“EPA”), USG Interiors, Inc. (“USG”) is submitting its response to the EPA’s Information Collection Request (“ICR”) for the above referenced NESHAP. USG’s responses pertain its two mineral wool manufacturing plants: one at 208 Adeline Street in Walworth, Wisconsin and one at 27384 Highway 61 Boulevard, Red Wing, Minnesota. Some of the questions in the ICR ask for confidential business information (“CBI”), and in response to those questions, USG has printed the letters “CBI” on the Excel spreadsh eet. USG has prepared a separate spreadsheet which contains the responses to the questions which seek CBI. As requested by the EPA, USG has submitted its confidential responses under separate cover to Mr. Robert Morales. I would appreciate a response email indicating that you have received this message due to the size of the attachments. Should you have any questions, please contact me at 312 - 436 - 5587. Sincerely, John Bolden Environmental Services Senior Manager United States Gypsum Company 550 W Adams St Chicago IL, 60661 Ph: 312 - 436 - 5587 Fax: 312 - 672 - 5587 Cell: 312 - 823 - 6702

Confidentiality Notice: This email is intended for the sole use of the intended recipient(s) and may contain confidential, proprietary or privileged information. If you are not the intended recipient, you are notified that any use, review, dissemination, copying or action taken based on this message or its attachments, if any, is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy or delete all copies of the original message and any attachments. Thank you.[attachment "2010 - 11 - 17 Non - CBI Cover Letter to EPA.pdf" deleted by Jeff

Te lander/RTP/USEPA/US] [attachment "Draft MinWool_ICR Forms_v12 USG - Combined Final.xlsx" deleted by Jeff Telander/RTP/USEPA/US] *********************** ATTACHMENT NOT DELIVERED ******************* This Email message contained an attachment named Draft MinWool ICR - Title V Permits, USG Interiors.zip which may be a computer program. This attached computer program could contain a computer virus which could cause harm to EPA's computers, network, and data. The attachment has been deleted. This was done t o limit the distribution of computer viruses introduced into the EPA network. EPA is deleting all computer program attachments sent from the Internet into the agency via Email. If the message sender is known and the attachment was legitimate, you should contact the sender and request that they rename the file name extension and resend the Email with the renamed attachment. After receiving the revised Email, containing the renamed attachment, you can rename the file extension to its correct name. For fur ther information, please contact the EPA Call Center at (866) 411 - 4EPA (4372). The TDD number is (866) 489 - 4900. *********************** ATTACHMENT NOT DELIVERED *********************** Confidentiality Notice: This email is intended for the sole use o f the intended recipient(s) and may contain confidential, proprietary or privileged information. If you are not the intended recipient, you are notified that any use, review, dissemination, copying or action taken based on this message or its attachments, if any, is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy or delete all copies of the original message and any attachments. Thank you. [attachment "Draft MinWool_ICR Forms_v12 USG - Combined Final RE V 11_30_10.xlsx" deleted by Jeff Telander/RTP/USEPA/U