We are correcting the following errors:

We omitted a compliance date for some of the changes made in the 2010 rule making their 

compliance dates unclear. In this correction, we clarify that all 2010 rule changes have a three 

year compliance date for existing sources, including monitoring requirements.

In establishing revised or new emission limits for existing cement kilns, it was not our 

intention to remove the existing emission limits on these kilns. However, when we revised the 

emission limits section the current emissions limits were overwritten by the new requirements. 

In these corrections we are adding back the emission limits as they existed prior to the 

September 9, 2010 rule amendments. This includes both the exiting source limits and new

source limits that existed at that time. 

In the Incorporation be reference section of Part 60 subpart A we inadvertently omitted 

§60.257(b)(3), which was previously incorporated in paragraph §60.17(h)(4). In this notice are 

adding this text to that paragraph.

On Table 1 of §63.1343 line 16 in the column titled “and if it is located” we left out the 

words “At a major source”, and are adding this language to the table.

Here is the table of emissions limits that existed prior to the 

last amendments. Please check it to be sure I didn’t get 

something wrong. 

Emissions limits in effect prior to September 9, 2010. Any 

source defined as an existing source in §63.1351, and that was 

subject to a PM, mercury, THC, D/F, or opacity emissions limit 

prior to September 9, 2010 must continue to meet the limits 

shown in Table 2 to this section until it has issued a 

notification of compliance with the appropriate emissions limits 

or monitoring requirement shown in Table 1 of this section, or 

September 9, 2013, whichever is earlier.
Table 2. Emissions limits in effect prior to September 9, 2010, for Kilns (Rows 1-4), 

Clinker Coolers (Row 5), and Raw Material Dryers (Rows 6-9). 

If your 

source is and

And if 

it is 

located 

at 

Your emissions 

limits are1:

And the units 

of the 

emissions limit 

are:

1. An existing 

kiln 

it commenced 

construction or 

reconstruction on or 

prior to December 2, 

2005

A major 

source

PM - 0.3

Opacity 

D/F – 0.22

THC - 503,4

lb/ton feed

percent

ng/dscm (TEQ)

ppmvd

2. An existing 

kiln 

it commenced 

construction or 

reconstruction after 

December 2, 2005

A major 

source

PM - 0.3 

Opacity

D/F – 0.22

THC – 203,5

Mercury – 416

lb/ton feed

percent

ng/dscm (TEQ)

ppmvd

ug/dscm

3. An existing 

kiln 

it commenced 

construction or 

reconstruction on or 

prior to December 2, 

2005

An area 

source

D/F – 0.22

THC – 503,4

ng/dscm (TEQ)

ppmvd

4. An existing 

kiln 

it commenced 

construction or 

reconstruction after 

December 2, 2005

An Area 

source 

D/F – 0.22

THC – 203,5

Mercury – 416

ng/dscm (TEQ)

ppmvd

ug/dscm

5.

An existing 

clinker 

cooler

NA A major 

source

PM - 0.1 

Opacity - 10

lb/ton feed

percent

6. An Existing 

raw 

it commenced 

construction or 

A major 

source

THC – 503,4

Opacity - 10

ppmvd

Percent
material 

dryer

reconstruction on or 

prior to December 2, 

2005

7.

An Existing 

raw 

material 

dryer

it commenced 

construction or 

reconstruction after 

December 2, 2005

A major 

source

THC – 203,5

Opacity - 10

ppmvd

percent

8.

An Existing 

raw 

material 

dryer

it commenced 

construction or 

reconstruction on or 

prior to December 2, 

2005

An area 

source

THC – 503,4 Ppmvd

9.

An Existing 

raw 

material 

dryer

it commenced 

construction or 

reconstruction after 

December 2, 2005

An area 

source

THC – 203,5 ppmvd

1 All emission limits expressed as a concentration basis (ppmvd, ng/dscm) are corrected to 

seven percent oxygen

2 If the average temperature at the inlet to the first particulate matter control device 

(fabric filter or electrostatic precipitator) during the D/F performance test is 400 oF or 

less this limit is changed to 0.4 ng/dscm (TEQ).

3 Measured as propane.

4 Only applies to Greenfield kilns

5 As an alternative a source may demonstrate a 98 percent reduction in THC emissions from 

the exit of the kiln or raw material dryer to discharge to the atmosphere. Inline raw 

mills are considered to 

an integral part of the kiln. 

6 As an alternative a source may route the emissions through a packer bed or spray tower 

wet scrubber with a liquid-to-gas ratio of 30 gallons per 1000 actual cubic feet per 

minute or more and met a site-specific emission limit based on the measured performance 

of the wet scrubber.
Here is how we will change the compliance date section:

(First Paragraph)

The compliance date for any affected existing source subject to any rule requirements 

that were in effect prior to December 20, 2006, is:

 June 14, 2002, for sources that commenced construction prior to or on March 24, 1998, 

or

 June 14, 1999 or startup for sources that commenced construction after March 24, 1998.

(Second Paragraph)

The compliance date for any affected existing source subject to any rule requirements that 

became effective on December 20, 2006, is: 

 December 21, 2009, for sources that commenced construction after December 2, 2005 

and prior to or on December 20, 2006, or

 Startup for sources that commenced construction after December 20, 2006.

(Third paragraph)

The compliance date for existing sources for all the requirements that become effective on 

November 8, 2010 will be September 9, 2013. 

(Fourth paragraph)

The compliance date for new sources is November 9, 2010 or startup, whichever is later.