Written Medical Opinion For Employer
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8Federal Register I Vol.
81,
No. 58 I Friday, March 25, 2016 I Rules and Regulations
16875
dust", "Silica,
crystalline
tripoli (as
quartz), respirable dust",
and "Silica,
crystalline
tridymite, respirable dust";
Substance
Silica, crystalline,
respirable dust
•
b.
Under the "MINERAL DUSTS"
heading of the table, revising the entry
for
"Silica: Cystalline
Quartz";
•
c.
Adding footnote 5;
and
•
d. Add footnote p.
TABLE Z-SHIPYARDS
CAS No.d
Cristobalite: see 1915.1053
......................................
..... ..........
..
..
..
..........
.
14464-46-1
14808--60-7
1317-95-9
15468-32-3
Quartz:
see 1915.10535
.......................................................................... .
Tripoli (as quartz): see 1915.10535
................................................
..
... ....
.
Trydimite: see 1915.1053
........................................................................ .
MINERAL DUSTS
Substance
SILICA:
The revisions and additions should
read as follows:
§ 1915.1000 Air contaminants.
*
*
*
*
*
ppm
a•
mg/m3
b•
Skin
designation
mppcf
O>
Crystalline
............................................. ............
..................................................
...
.......................... ............................................ .
250(k)
Quartz. Threshold Limit calculated from the formula
<P> ......................................................................................
.............................. ..
%
Si0
2
+5
5
See Mineral Dusts
table
for the exposure limit for any operations or sectors where
the exposure
limit in
§
1915.1053
is
stayed or is otherwise
not in effect.
·The PELs
are 8-hour TWAs unless otherwise
noted;
a (C) designation denotes a ceiling limit. They are to be determined from breathing-zone
air
samples.
a
Parts
of
vapor or gas per million parts of contaminated air by volume
at 25 °C
and 760
torr.
b
Milligrams
of substance per cubic meter of
air.
When entry is in this
column
only, the
value
is exact: when listed with a ppm entry, it is ap-
proximat~;
•
•
•
•
•
•
PThis standard applies to any operations or sectors for which the respirable crystalline silica standard, 1915.1053, is stayed or otherwise is not
in effect.
•
7.
Add§ 1915.1053 to
read as follows:
§1915.1053 Respirable crystalline silica.
The requirements
applicable
to
shipyard
employment
under this
section
are identical to those
set
forth at
§ 1910.1053
of
this
chapter.
PART 1926-SAFETY AND HEALTH
REGULATIONS FOR CONSTRUCTION
Subpart D-Occupatlonal Health and
Environmental Controls
•
8.
The
authority citation
for
subpart
D
of part
1926 is revised
to read
as
follows
:
Authority:
Section 107 of the Contract
Work Hours
and Safety Standards
Act (40
U.S.C.
3704); Sections 4, 6, and
8 of the
Occupational Safety
and Health
Act of 1970
(29 U.S.C.
653, 655, 657); and
Secretary of
Labor's Order No. 12-71 (36 FR 8754), 8-76
(41 FR 25059), 9-83 (48 FR
35736),
1-90 (55
FR
9033),
6-96 (62 FR 111),
3-2000
(65 FR
50017),
5-2002 (67 FR 65008), 5-2007 (72 FR
31160),
4-2010 (75 FR 55355), or 1-2012 (77
FR 3912), as applicable; and 29 CFR part
1911.
Sections 1926.58, 1926.59, 1926.60,
and
1926.65
also
issued under 5 U.S.C. 553
and
29
CFR
part 1911.
Section 1926.61 also issued under 49
U.S.C.
1801-1819
and 6 U.S.C. 553.
Section 1926.62 also issued under
section
1031 of the Housing and Community
Development Act of 1992 (42 U.S.C.
4853).
Section 1926.65 also issued under section
126
of the
Superfund Amendments
and
Reauthorization Act of 1986, as
amended
(reprinted
at
29 U.S.C.A. 655 Note),
and
5
u.s.c.
553.
•
9. In§ 1926.55,
amend appendix A:
•
a. By revising
tl10
entries
for
"
Silica,
crystalline
cristobalite, respirable dust",
"Silica,
crystalline quartz, respirable
dust",
"Silica,
crystalline tripoli (as
quartz), respirable dust", and "Silica,
crystalline tridymite, respirable dust";
•
b. Under the
"MINERAL
DUSTS"
heading of the table, by revising the
entry for "Silica: Cystalline Quartz" in
column 1;
•
c. Adding footnote
5;
and
•
d. Adding footnote p
.
The revisions and additions read as
follows:
§ 1926.55
Gases,
vapors, fumes, dusts,
and mists.
*
*
*
*
*
Appendix A to§
1926.55-1970
American Conference of Governmental
Industrial Hygienists' Threshold Limit
Values of Airborne Contaminants
THRESHOLD LIMIT VALUES OF AIRBORNE CONTAMINANTS FOR CONSTRUCTION
Substance
CAS No.d
ppm
a•
mg/m3
b*
Skin designation
Silica, crystalline, respirable dust
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