1 New York State Department of Environmental Conservation Best Available Retrofit Technology Determination

Facility Owens Corning Insulating Systems, LLC

Location Bethlehem, NY Albany County
Permit ID 4-0122-00004 Source Category Glass Fiber Processing Plant

I. Introduction

The above referenced facility contains at least one emission source that falls under the requirements of the federal Best Available Retr ofit Technology (BART) rule under 40 CFR Part 51 and Appendix Y, and the New York State BA RT regulation as codified under 6 NYCRR Part 249. These requirements affect an emission s ource which fulfills the following criteria:

1. Falls within one of 26 sp ecific source categories,
2. Was not in operation prior to August 7, 1962 and was in existence on August 7, 1977, or
underwent reconstruction between August 7, 1962 and August 7, 1977, and
3. Has a potential to emit (collectively, with ot her emission sources at the facility which fulfill items 1 and 2) of 250 tons per year or more of any visibility-impairing pollutant.

Emission sources that are deemed eligible by the above criteria may be exempted by the BART analysis through severa l means, as follows:

1. A permit condition may be accepted which restrict s the eligible source’s potential to emit to less than 250 tons per year for each vi sibility-impairing pollutant, as per Part 249.1(c)(1).
2. A permit condition may be accepted that requires the source to permanently shut down the unit by January 1, 2014, as per Part 249.1(c)(2).
3. The facility may show through modeling or other means acceptable to the Department that it does not or will not emit any combina tion of visibility-impairing pollutants that results in a visibility impairment equal to or greater than 0.1 deciviews in any federal Class I area, as per Part 249.1(c)(3).

II. Proposed BART Compliance Method

Owens Corning Insulating Systems submitted their BART compliance recommendation in a BART Modification Application da ted September, 2010. The plant in question, located in Feura Bush, is a wool fiberglass insulation products manufacturing plant. Owens Corning and the Department had previously identified the units associated with the production process of manufacturing lines DM1 and DM2 as BART-eligi ble. These comprise the following emission
units:

• U-00002 – DM1 Oxy Fuel Furnace

• U-00003 – DM1 Forming/Cooling

• U-00012 – DM2 Oxy Fuel Furnace2 • U-00013 – DM2 Mixing Chamber

• U-00014 – DM2 Cooling Area

Owens Corning has opted to accept conditions in its Title V permit to cap emissions of NO
x , SO 2 and PM 10 from its BART-eligible units to below the 250 tpy threshold pursuant to Part 249.1(c)(1), effectively eliminating the source from the third criterion of BART eligibility. For this reason Owens Corning was not required to submit a five-factor BART analysis for the Feura Bush plant to the Department.

Compliance with these emission caps will be established based on emission calculations, performed on a monthly basis to determine the 12-month rolling summation of emissions of each visibility impairing pollutant. These emission cal culations are defined in the modified permit.

III. BART Determination

The Department accepts Owens Corning’s proposal to cap the BART-eligible units at the Feura Bush plant to a collective 249 tons per year each for NO
x , SO 2 , and PM 10 . The modified Title V permit was issued on May 18, 2012. The Department is submitting this permit to EPA to demonstrate that this facility is effec tively removed from Part 249 applicability.