Company Plant

Furnace Basis for Chrome Emissions

K1

CertainTeed tested the K2 furnace only. Therefore the average chrome and hex chrome emission rates (lb/ton) from 

testing on the Kansas city K2 furnace (dated 11/2010) was multiplied by the annual pull rate of K1 that CertainTeed 

provided in the ICR. 

K2 The average chrome and hex chrome emission rates (lb/ton) from testing on the Kansas city K2 furnace (dated 

11/2010) was multiplied by the annual pull rate of K2 that CertainTeed provided in the ICR. 

Electric Melt Furnace (3 

Furnaces) - 300X Rotary

Microfiber Process

The average chrome and hex chrome emission rates (lb/ton) from testing on the Waterville Ducon Stack 4 was 

multiplied by the sum of the annual pull rate of 3 (out of 6) of the 300x line furnaces (which was provided by JM on the 

ICR). JM was contacted and a representative stated he was not sure how furnaces were routed to the stacks but it 

would be good to assume that 3 furnaces go to Ducon 4 and the other three go to the Ducon 5 stack. 

Electric Melt Furnace (3 

Furnaces)- 300X Rotary

Microfiber Process

The average chrome and hex chrome emission rates (lb/ton) from testing on the Waterville Ducon Stack 5 was 

multiplied by the sum of the annual pull rate of 3 (out of 6) of the 300x line furnaces (which was provided by JM on the 

ICR). JM was contacted and a representative stated he was not sure how furnaces were routed to the stacks but it 

would be good to assume that 3 furnaces go to Ducon 4 and the other three go to the Ducon 5 stack. 

Pot & Marble Units 29-34

The average chrome and hex chrome emission rates (lb/ton) from Waterville testing on Pot & Marble units 29 & 30 was 

multiplied by the pull rates of pot and marble units 29-34 (given by JM). JM was contacted to ensure the calculation 

was done correctly - Brent Tracy approved the methodology. The emission testing results for 29 and 30 had a larger 

lb/ton emission rate for Hex chrome than for chrome.

Pot & Marble Units 35-40

The average chrome and hex chrome emission rates (lb/ton) from Waterville testing on Pot & Marble units 29 & 30 was 

multiplied by the pull rates of pot and marble units 35-40 (given by JM). JM was contacted to ensure the calculation 

was done correctly - Brent Tracy approved the methodology. The emission testing results for 29 and 30 had a larger 

lb/ton emission rate for Hex chrome than for chrome.

Pot & marble 1-28

The average chrome and hex chrome emission rates (lb/ton) from Waterville testing on Pot & Marble units 29 & 30 was 

multiplied by the pull rates of pot and marble units 1-28 (given by JM). JM was contacted to ensure the calculation was 

done correctly - Brent Tracy approved the methodology. The emission testing results for 29 and 30 had a larger lb/ton 

emission rate for Hex chrome than for chrome.

Oxyfuel Furnace DM1 Delmar provided chrome and hex chrome testing reports dated 5/2001. The testing was performed on the DM1 DEP 

Outlet. The average chrome emission rate (lb/ton) was multiplied by the glass pull rate of DM1 provided in the ICR. 

Oxyfuel Furnace DM2

Delmar provided chrome and hex chrome testing reports dated 5/2001. The testing was performed on the DM2 DEP 

Outlet. The chrome average emission rate for the tests were multiplied by the glass pull rate of DM2 provided in the 

ICR. 

Oxyfuel Furnace 621 The average chrome and hex chrome emission rate (lb/ton) from testing on the Lanett 621 furnace (dated 10/2010) 

was multiplied by the annual pull rate of 621 which was provided by Knauf in the ICR. 

CertainTeed Kansas city

Johns 

Manville Waterville

Owens 

Corning Delmar

Knauf Lanette
Company Plant

Furnace Basis for Chrome Emissions

Oxyfuel Furnace 622 Knauf only tested furnace 621. Therefore, the average chrome and hex chrome emission rate (lb/ton) from testing on 

the Lanett 621 furnace was multiplied by the annual pull rate of 622 which was provided by Knauf in the ICR. 

CertainTeed Chowchilla C1 Furnace

The average chrome emission rate (lb/ton) from testing on the chowchilla C1 furnace (4/2005) was multiplied by the 

annual pull rate of C1 which was provided by CertainTeed in the ICR. Chowchilla, however, did not provide testing for 

hex chrome. Therefore, the hex chrome emission rate for Chowchilla was based on the chromium emission rate times 

the ratio of hex chrome to chrome at CertainTeed Kansas city since they are both oxy fuel furnaces. 

Oxyfuel Furnace - V1 The average chrome and hex chrome emission rates (lb/ton) from testing on the Waxahachie V1 furnace (8/2010) was 

multiplied by the annual pull rate of V1 which was provided by OC in the ICR. 

Cold Top Electric - V2

Because no chrome or hex chrome testing was provided for V2 or V3, and because the V1 furnace tested at 

Waxahachie is an oxyfuel and V2/V3 are cold top electric, the average chrome and hex chrome emission rate from 

similar sources (cold top with similar control devices) at 2 other facilities (for which data was provided) were used and 

multiplied by the pull rate of V2 provided in the ICR. 

Cold Top Electric - V3

Because no chrome or hex chrome testing was provided for V2 or V3, and because the V1 furnace tested at 

Waxahachie is an oxyfuel and V2/V3 are cold top electric, the average chrome and hex chrome emission rate from 

similar sources (cold top with similar control devices) at 2 other facilities (for which data was provided) were used and 

multiplied by the pull rate of V3 provided in the ICR. 

Oxyfuel Furnace -A2

The average chrome emission rate (lb/ton) from testing on the Athens A2 furnace (2/2007) was multiplied by the annual 

pull rate of A2 which was provided by CertainTeed in the ICR. Athens, however, did not provide testing for A2 hex 

chrome. Therefore, the hex chrome emission rate for A2 was based on the A2 chromium emission rate times the ratio 

of hex chrome to chrome at CertainTeed Kansas city Oxyfuel Furnace.

Cold Top Electric Furnace - 

A1

The average chrome emission rate (lb/ton) from testing on the Athens A1 furnace (1/2007) was multiplied by the annual 

pull rate of A1 which was provided by CertainTeed in the ICR. Athens, however, did not provide testing for A1 hex 

chrome. Therefore, the hex chrome emission rate for A1 was based on the A1 chromium emission rate multiplied by the 

average ratio of hex chrome to chrome of similar cold top electric furnaces for which data was provided. 

Knauf Lanette

Owens 

Corning Waxahachie

CertainTeed Athens