C3-3941. Verification of Underground Coal Mine Operators' Dust Control Plans and Compliance Sampling for Respirable Dust

Correction

In proposed rule document 03-3941 beginning on page 10784 in the issue of Thursday, March 6, 2003, make the following corrections:

1. On page 10794, in the first column, in the second paragraph, in the ninth line, “[(10.0%+7.2%+16.1%)3=11.1%]”, should read “[(10.0%+7.2%+16.1%)÷3=11.1%]”.

2. On page 10795, the table heading should have appeared as follows: “Table III-1. For Two Scenarios, Using Alternate Methods, Percent of Quartz in Respirable Dust”.

3. On page 10803, in the third column, the fourth line from the bottom, “(2.6mg/m³ 4)”, should read “(2.6 mg/m³÷4)”.

4. On page 10816, in the second column, in footnote number nine, in the last line, “P(X>) 10”, should read “P(X>10)”.

5. On page 10839, in the first column, the heading “3. Biological Respirable Coal Mine Dust”, should read “3. Biological Action: Respirable Coal Mine Dust”.

6. On page 10842, in the table, in the first column, under “Studies”, in the first line, “Hansen, et al.,”, should read “Hansen, et al., 1999”.

7. On page 10849, in the second column, in the 20th line, “(MSHA, datafile: RBDA2001.ZIP)”, should read “(MSHA, datafile: RB-DA2001.ZIP)”.

8. On page 10853, in the first column, the first equation within the footnotes is corrected to read as follows:

λ′ = P_y′ − P_x′

9. On page 10857, Table IX-2-2 is corrected to read as set forth below

Table IX-2-2.—Estimated Number of Affected Mechanized Mining Units ^a (MMUs) and Affected Underground Coal Miners, by Production Shifts and Mine Size

Mine size by number of employees										Totals
Number of production shifts	Less than 20 employees			20 to 500 employees			Greater than 500 employees			MMUs n=	DOs  b n=	NDOs  c n=	Total affected miners on MMUs
	NMUs n=	DOS  b n=	NDOs  c n=	MMUs n=	DOs  b n=	NDOs  c n=	MMUs n=	DOs  b n=	NDOs  c n=
One	98	98	588	24	24	144	0	0	0	122	122	732	854
Two	16	32	192	264	528	3,168	0	0	0	280	560	3,360	3,920
Three	0	0	0	55	165	990	18	54	324	73	219	1,314	1,533
Totals	114	130	780	343	717	4,302	18	54	324	475	901	5,406	6,307
a Affected MMUs in production are estimated by applying the observed percentage of MMUs' production shifts by mine size (as of July 10, 2002) to the snapshot of active MMUs as of May 14, 2002, by mine size, and multiplied by 0.570 (since fifty-seven percent of MMUs have a pattern of recurrent overexposures) (MSHA Table, July 10, 2002; MSHA Table, May 14, 2002).
Where:
b DO = Designated Occupational Miners = (MMUs * 1 * production shifts).
c NDO = Non-designated Occupational Miners = (MMUs * 6 * production shifts).

10. On page 10860, in the first table, in the eighth column, under “Prevented cases, n=”, in the second line, “3.18”, should read “3.8”.