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 monito ring 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 are 1 : 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

– 0.2 2 THC
- 50 3,4 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

– 0.2 2 THC

– 20 3,5 Mercury

– 41 6 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

– 0.2 2

THC

– 50 3,4 ng/dscm (TEQ) ppmvd

4. An existing kiln it commenced

construction or reconstruction after December 2, 2005 An Area source D/F

– 0.2 2

THC

– 20 3,5 Mercury

– 41 6 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

– 50 3,4

Opacity

- 10 ppmvd Percentmaterial 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

– 20 3,5

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

– 50 3,4 Ppmvd

9. An Existing raw material dryer it commenced

construction or reconstruction after December 2, 2005 An area source THC

– 20 3,5 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 o F 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.