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Jar conduction defects other than isolated right bundle branch block, angina pectoris,
arrhythmia, coronary artery disease). Juxta-articular osteonecrosis.
Source: 39 FK 23502, June 27 iB-
otherwise noted. Redesignated
23072. May 28. 1975.
**
*
Appendix B--Guidelines for
1910.1000 Air contaminants.
i
Scientific Diving
An employee's exposure to *n.
This appendix contains guidelines that will be used in conjunction with $ 1910.401{a)(2)(lv> to determine those scien tific diving programs which are exempt
from the requirements for commercial diving. The guidelines are as follows:
1. The Diving Control Board consists of a
majority of active scientific divers and has autonomous and absolute authority over the scientific diving program's operations.
2. The purpose of the project using scien tific diving is the advancement of science; therefore, information and data resulting from the project are non-proprietary.
3. The tasks of a scientific diver are those of an observer and data gatherer. Construc
tion and trouble-shooting tasks traditionally associated with commercial diving are not Included within scientific diving.
4. Scientific divers, based on the nature of their activities, must use scientific expertise
in studying the underwater environment and, therefore, are scientists or scientists in training.
terial listed in table 2-1, Z-2, % **
this section shall be limited in
**
ance with the requirements of
lowing paragraphs of this section **
(a) Table Z-l:
(1) Materials with names prw
buy "Ck, "---uCueitlinngj Vvalues. An eemouiplaSTIS1'*f expo>seunrrep ftofi oannvy material *i--n t ab)*
the name of which Is preceded
"C" (e.g.. C Boron trifluoride)
*
no time exceed the ceiling value*3* for that material in the table. ****
(2) Other materials--til.
toeiphfed averages. An employee'*!?
posure to any material in table ^
the name of which is not preceded?
"C", in any 8-hour work shift of * J*
hour work week, shall not exceed
8-hour time weighted average gfafe for that material in the table.
(b) Table Z-2: (1) 8-hour
weighted averages. An employee'* ^
150 FR 1050, Jan. 9. 1985)
posure to any material listed intuit Z-2, in any 8-hour work shift of a b
Subports U--Y (Reserved]
hour work week, shall not exceed aft 8-hour time weighted average 3jtf|
Subpart Z---Toxic and Hazardous Substances
given for that material in the tablcu ^ (2) Acceptable ceiling concent#
tions. An employee's exposure ta.fr
Authority: Secs. 6. 8, Occupational Safety and Health Act (29 U.S.C. 655, 657); Secretary of Labor's Order No. 12-71 (36 FR 8754); 8-76 (41 FR 25050); or 9-86 (48 FR 35736), as applicable; and 29 CFR Part 1911.
Section 1910.1000 Tables -1, 2-2. Z-3 also issued under 5 UJS.C. 553.
Section 1910.1000 not Issued under 29
CFR Part 1911. except for ``Arsenic" and "Cotton Dust" listings in Table Z-l.
Section 1910.1001 also issued under Sec. 107 of Contract Work Hours and Safety Standards Act, 40 U.S.C. 333.
Section 1910.1002 not issued under 29
U-S.C. 655 or 29 CFR Part 191L; also Issued under 5 U.S.C. 553.
Sections 1910.1003 through 1910.1018 also issued under 29 U.S.C. 653.
Section 1910.1025 also issued under 29 U-S.C. 653 and 5 U.S.C. 553.
Section 1910.1043 also Issued under 5 U-S.C. 551 et set}.
Sections 1910.1045 and 1910.1047 also issued under 29 U.S.C. 653.
Sections 1910.1200. 1910.1499 and 1910.1500 also issued under 5 U.S.C. 553.
material listed in table Z-2 shall
exceed at any time during an 8-heiif .
shift the acceptable ceiling coneeattfe
tion limit given for the material tag*
table, except for a time period* and #'
to a concentration not exceeding tfrjt
maximum duration and concentrate*
allowed in the column under "accqlfr-
ble maximum peak above the accept
ble ceiling concentration for an 8-bcOf
shift".
(3) Example. During an 8-hour iwnf
shift, an employee may be exposed w
a concentration of Benzene above**
p.p.m. (but never above 50 p.p.m.)
for a maximum period of 10 mindt*%
Such exposure must be compens**^
by exposures to concentrations Rgi
than 10 p/m so that the cumuiy^g,
exposure for the entire 8*hour
shift does not exceed a weighted
age of 10 p/m
__ If-
(c) Table Z-3; An employee's
sure to any material listed in taWf
676
0I Safety and naaitn Mamtn., taaor
S IVIU.IUVU
8-hour work shift of a 40-
. -* `{'v- week, shall not exceed the * '/ u'me weighted average limit *>r that material in the table.
- imputation formulae: 1 /rhe cumulative exposure for work shift shall be comput-
Actual concentreuon ol 6-
nout exposure
6-nour time average eiposute limit
Acetone (Table Z-l)............. 2-8utanne (Table Z-1)......... TpH>ene (Table Z-2).............
500 p/m.,,. 45 p/m..... 40 p/m......
1.000 p/m 20C p<m 200 p/m
,31 icuvs:
I
+ . C*7*') 4- 8
eauhalent exposure for the work-
Substituting in the formula, we have:
E77i = S00-rl .000 + 45 +200 +40 - 200 Em-0.500+ 0.225-r 0.200 Em-0.925
concentration during any period T where the concentration remains
*ir.t. a the duration in hours of the exposure t\zt concentration C.
^ v&jue of E shall not exceed the 8rj time weighted average limit in ^ Z-l. Z-2, or Z-3 for the material
reived. 2) To illustrate the formula precjed in paragraph (dXltti) of this *rjon. note that isoamyl acetate has
c l-hour time weighted average limit a *90 p.p.m. (table Z-l). Assume that a employee is subject to the follow3 exposure:
tro hours exposure at 150 p/m hro hours exposure at 75 p/m Iwr hours exposure at 50 p/m
instituting this information in the Sraula. we have
d* 150 + 2x75 + 4x50) + 8 = 81.25 p/m
Sac 81.25 p.p.m. is less than 100 *wn.. the 8-hour time weighted aver ts limit, the exposure is acceptable.
'2) (l) In case of a mixture of air conHainants an employer shall compute -c equivalent exposure as follows;
Since Em is less than unity (1). the ex posure combination is within accepta
ble limits. (e) To achieve compliance with para
graphs (a) through (d) of this section,
administrative or engineering controls must first be determined and imple mented whenever feasible. When such
controls are not feasible to achieve full compliance, protective equipment or any other protective measures shall be
used to keep the exposure of employ ees to air contaminants within the limits prescribed in this section. Any equipment and/or technical measures used for this purpose must be ap proved for each particular use by a competent industrial hygienist or other technically qualified person. Whenever respirators are used, their
use shall comply with 1910.134.
Table 2-1
Substance
p/m* mg./M*
230 360 10 25 5 20
1.000 2.400 40 70
Acetylene dichionde. see 1. 2-
E=(Ci+Li+C+L)+ . - . (C.+L.)
*here: s is the equivalent exposure for the Mature. * the concentration of a particular con*&mant. ^ u the exposure limit for that contami^t. from table Z-l, Z-2, or Z-3.
^ value of Em shall not exceed
^dty (i). To illustrate the formula prein paragraph (d)(2)(i) of this
f"*'uon. consider the following expo-
2-Aminoetnanol. see Ewanola-
.
Amsxline (o. pnsomers)--SAin...... Antimony end compounds (as Sb)
1 14 0.1 0 25
0.3 0.25 25
3 10 45 2 12
05 2
50 35
15
100 i 525
125 1 650
5 i
01.S9
0.5
677
cc C
s U u
uiri
Table Z-1--Continued
Qf------------------------------------------------Substance
p/m*
ANTU (alpha naphthyl thiourea)..... Arsenic organic compounds (as
As).................................................... Arsine................................................... Azmprios-methyt--Shm.....................
0.05
Benzyl chkmde....................................
1
Biohenyt sen fhphenyl
..................
C Boron tnlluonde............................ Bromine...................... ........................ Bromolorm--Skin.............................. Bc.adier>e (i, 3-butad>ene)...............
1 0.1 0.5 1.000
2-Butanone.......................................... 2-Butoxy ethanol (Butyl Cello-
solve)--Skm..................................... Butyl acetate (n-butyl acetate)......... sec-Butyl acetate........................ .......
200
50 150 200
sec-Butyl alcohol__ __ ____________ tan-Butyi alcohol................................
C tart-Butyt chromate (as CrOi>-- Skm............................ ............... .
n-Butyl gtytidyl elher (8GE).............. Butyl mercaptan............................. _.. p-tert-Butyttoluene..............................
Camphor............................ .................
150 100
50 10 10
Caibon dioxide.................................... Carbon monoxide...............................
5,000 50
Chiormated diphenyl oxide............._. C Chiome........................................... Chlorine dioxide................... ............... C Chlorine triftuonde....... .............. C ChloroacetaWehyde....................... a-Chloroacetopherone (pnena-
cytchkmde)......................................
Chlorobenzene (monochlorobenzene).................................................
oOKorobenzyhdene malononitrile (OCBM).............................................
Chlorobromomethane........................ 2-Chloro-l.3-butachene, see Chlo-
1 0.1 0.1
1
0.05
75
0.05 200
Chlorodtphenyl (42 percent Chlonne>--Skin.......................................
Chtorodphenyl (54 percent Chloone)--Shm.......................................
t-Chloro. 2.3-epoxypropane, see
2-Chloroetnanoi, see Ethylene
chtorohydnn..................................... ...... ..............
CNoroethylene. see Vinyl chlonde..
C Chloroform (tnchloromethane).....
50
1-Chtoro-t-nitropropane.....................
20
Chioropicrin..........................................
0.1
Chtoroprene (2-chior0-1.3- butadi-
25
Chromum. sol. chromic, chro-
Metal end msol. sens........................
mg./M
0.3
0.2 0.2
5
3 0.7
5 2.200
590 240 710 950
450 300
0.1 270
35 60
2
9.000 55
0.5 3
0.3 0.4
3 0.3 350 0.4 1.050
1 0.5
240 100 0.7
90
1
Table Z-1 --Continued
Substance
p/m
Coal tar pitch volatiles (benzene
soluble traction) anthracene,
BaP, phenanthrene, acndine,
chrysene, pyrene
Cobalt, metal fume and dust....
Copper fume
Ousts and Mists
Cotton dust (raw)
Crag* herbicide
Cresol (all isomers)--Shin.--......
Crotonaldefryde
Cumene--Shm
Cyanide (as CN)--Shin..-
Cyclohexane
Cyclohexanol
Cyclohexanone
Cyclohexene
Cyclopentadiene
2.4-0................................................
ODT--Shin.............. ........_...............
DDVP--Shin............ ....................._....
Decaborane--Shin
Demelon*--Shin
Diacetone alcohol (4-hydroxy-4-
methyt-2-pentanone)... .............
1.2-diaminoethana. see Ethylene-
diamine............................................
Diazomethane................... ................
Diborane
Dibutyl phosphate
Dibutylphthalate
C o-Dichlorobenzene____
p-0<chlorobenzene
Dichlorodlfiuoromethane.-...............
1.3-Dichloro-5,S-dimethyl hydarv
toin....................................................
1.1-Dichloroe thane............................
1.2-Dichloroethylene...................... ..
C Oichloroethyl ether--Shin............
Dichioromethane, see Methyierv
echlohde............. ........................... Dichloromonofluofomethane............
1,000
C 1.1-Dichtoro-t-mtroethane.............
10
1,2-Dichloropropane, see Propy-
tenedichlohde................... ......................
Drchlorotetrafboroethane..................
1.000
Oieldnn--Shin...................................... .......
Diethylamine........................................
25
Dietftylamino ethanol--Shin...._........
10
Diethylether, see Ethyl ether............... .... Difluorodibromomethane...................
too
C Diglycidyl ether (DGE).... ..............
0.5
Dihydroxybenzene, see Kydro-
quinone....._.................. ...........................
Diisobutyl ketone.......................... ......
..."so
Dnsopropylamme--Skin..... ...............
5
Dimethoxymothane, see Methyial..... ......
Dimethyl acetamide--Shm................
10
Dimethylamin#............... .....................
10
Dimethylammobenzene. see Xyl
dene.......................................... .................
Dimethylanilme (N-dimethyl- ani line)--Shm ....................... ...............
Dimethylbenzene, see Xylene............. _...
Dimethyl i ,2-dibromo-2.2-dichioroetnyl phosphate, (Ditxom)...................
Dimothyllofmamide--Shin.................
2.6-Dimethythepianone, see Diiso-
bwtyt hetone.............................................. 1. t -Dimelhylhydrazme--Shin............
0.5
JVv*
4Jtf:
678
^isn01 Table Z-1--Continued
Table Z-1--Continued
Sjcaunce
.. -ww (' lsome,s,"
* (t*tn>iene dioxide)--
"ZZ...------- ---------i***-*1**+ isocyanate.......
twdhenyl socyarv
r* -- ....... -................... --
jTycd methyl ether--
* ^ pmalata (Di-2- eth-
**rtheiaie>..................
Shin.
K^r**#*- *opyterv
^^.l^ropanol. see Gtyci-
*'' f tit Ethylmercaptan _..
^aj^mano*--Shin .................... (CeOo-sofve
\tm' e"~................. .........--
-w cectte----------- ------ -- v wt*te--Shm...-.....--....
msM (ethanoO--................. 3h
Mc-emyl hetone (5- methylVesoncne)................................. 3earzene.--.......................... ft yanedt............. ...................... 3*5*)/ hetone (3- Heptanone)..
3*S*tO.
--
3* Bm*ta____ 3V mercaptan.
Osteite____
cniorohydnn--Shin............
Swrederwie....... ............. .
Cbean* gtycol dinitrate and/or '^rcenn--Skin........................
'a'**,e glycol monomethyl ether e. see Methyl cellosofve **e....... ...................................
{s',e xnme-Skm........................ chloride, see 1,1- Dich-
*w*ne
^torp..h.o.to..T.e--SJun........ .
n iiuZZZZZ. Uj n____ Nete_________ ^V-Mteromethane... CV"-S-hm---..-.-._-----^fcohol--...................
^ t2.3-Epoxy.l- propanol) monoetfiy, ether, see
^I^wthanol..................
**e Aor^hosmethyl...
5^-sizzzizi ry^-hUfne)-..........
^7*wthane--Skm..._.......
p/m*
mg./M1
Substance
p/m*
mg /M*
0.2
500 1.800
410
1 Hoxone (Methyl isobutyt ketone)....
too
410
0.2 50
1.5
10
too 360
7
0.2 1
10
100 600
5 0.1 19 0.5
0.05 0.1 100
0.2 2 1
10 525
Jsopropyt acetate.................................
250
950
3 200
100 400
25 1,000
10
25 100 200
50
1.000 400 100 10 100 5 10
0.2
0.5
20
0.1 1.000
5 5 SO 50
... .
500 1
6 740
540 1,400
100 1,900
IB
L.P.G. (liqurfied petroleum gas).......
130 435 690 230
2.600 1,200
300 25
650 16 25
Methanethiol, see Methyl mercap2-Methoxyetnanof. see Methyl celMethyl acetylene-propadiene mix-
1 Methyl amyl alcohol, see Methyl
1
94 IS
2.5 0.2 5.600
9 20 200 150
Methyl (n-amyl) hetone (2- HepMethyl butyl ketone, see 2- HexMethyl celtosolve acetate--Shin....
o-Methylcydohexanone--Shm......... Methyl ethyl ketone (MEK). see 2-
0.5 05 2,000 10
Mfcl'iyl isobutyl carbinol--Skin......... Methyl isoDuTyt ketone, see
C Mothyi mercaptan..........................
50 0.5
1,000
0.25 25
200 1.000 1.000
200 10
240 0.9 0.5
1.600
1 5 100
15
610 1.650
1.600 35
3.100 260 12
100 465 20 80
25 60 25 120
1.900 2.900 100 470 1O0 460
100 250 5 26
25 too
0.02 10
100 !
0.05 20
410
679
ABD00094331
b
i\
K 1910.1000
29 CFR Ch. XVII (7.1*7
Table Z-1--Continued
Substance
p/m*
mg./M *
Table Z-1--Continued
Substance
Methyl propyl ketone, see 2- Pen-
C# Methyl styrene........................... C Methylene fcsphenyl isocyanate
Molybdenum:
100
C Monomethyl hydrazine-- Skin....
Naphthalene...............-...................... Nickel carbonyl................................... Nickel, metal and soluble cmpds.
as Ni..... ............. .............................
0.2
10 0.001
p-Nitroanihne--Skin........................... Nitrobenzene--Skin...... ...................
Nitroethane........................................ C Nitrogen dexide............................ Nitrogen trrflupnde............................. C Nitroglycenn--Skm......................... Nitromethane..................................... 1-Nitropropane................................... . 2-Nitropropane...... ............................. Nitrotohiene--Skin............................ . Nitrotnchloromelhane. see Chloro-
Octachioronaphthalene--Skin.......... Octane................................................. Oil mist mineral.......... .......................
Oxalic acid........................................... Oxygen difluonde........ ...................... Ozone...................................................
1 1
100 s
10 0.2 100 25 25
5
500
0.05 0.1
Pentaborane.........................................
0.005
..... ......Pentachlorophenoi--Skm..................
Pentane................................................
1.000
2-Pentanone.........................................
200
Perchlorometbyl mercaptan..............
0.1
Perchloryl fluoride..............................
3
Petroleum distillates (naphtha)........
500
Phenol--Skm.......................................
5
Phenyl ether (vapor).......................... Phenyl ether-biphenyl mixture
(vapor)...............................................
1 1
Phenyl glyodyl ether (PGE).............. Phen^hydrazine--Skin......................
10 5
Phosgene (carbonyl chloride)........... Phosphine.............................................
0.1 0.3
Phosphorus trichloride....................... Pnthakc anhydride..............................
0.5 2
Ph'Sl* (2-Pivafyi-1.3- mdandione)..... j
.Ptatmum (Soluble salts) as Pi..........I ....... ...........
ProQane...... .............. .........................1
1.000
480
0.2
0.3S
50 0.007
1
6 5
310 9
29 2
250 90 90 30
0.1 2.350
5
1 0.1 0.2
0.01
0.5 2,950
700 0.6 13.5 2,000 19
7
7
60 22
0.4 0-`
3 12
0.1 0.002 1,800
rvPropyi acetate --............................. Propyl alcohol n-Propyl nitrate
Propylene dichlonde___ Propylene imme--Skin. Propylene oxide______ Propyne, see Methytacetyfenc....... Pyrethrum Pyndine Ouinone Rhodium, Meiai tume and dusts,
as Rh............ ........................... ....... Soluble salts....................................... Ronnel....... ..........................................
Rotenone (commercial).................... Selenium compounds (as Se).......... Selenium hexafluoride_______ ____ Silver, metal and soluble com
pounds ............................................. Sodium fluoroacetate (1080)--
Skin.......
Sodium hydroxide... Stibme.................. .... Stoddard solvent________ Strychnine. Sullur dioxide____ ______________ __ Sulfur hexafluoride. Sulfunc acid. Sulfur monochlonde____ Sulfur peniaftuoride............................ Sutturyl fluoride.. Systox. see Demeton*.. 2,4.ST.................................. Tantalum................... ........ TEDP-Skin............ ............ ..... _.. Tellurium................ ........ Tellurium hexaffuonde.. TEPP-Skin.. C Terphenyts..
1.1.1.2-Tetrachloro-2.2drfluoroethane
1.1.2.2-T etrachloro- i ,2difiuoroethane__________ _____
1.1.2.2-Tetrachloroethane--Skm. Tetrachloromethane, see Carbon
tetrechlofide...................................... Tenachtoronaphthaiene--Skin......... Tetraethyl lead (as Pb)--Skin....... Tetrahydrofuran --
Tetramethyl lead (as Pb)-- Skin..... Tetramethyi sucemomtnle-- Skin.. Tetranitromefhane......................... . Tetryl (2.4,6-tnnitropherry) methyi-
nitramme)--Skin. Thallium (soluble compounds)--
Skm as T1. Thrram..
Tin (inorganic cmpds. except oxides..
Tin (organic cmpds)....... ...... C Toiuene-2,4-diisoeyanaie. o-Toluidine-- Skin.
Toxaphene. see Chlorinated camphene................. ........ ......................
Tnbutyi phosphate..
1.1.1-Tncnioroethane, see Methyl chloroform.
1,t.2-Tnchloroothane--Skin.. Titanumdionae.. Tnchioromeihane. see Chloroform.
200 10
680
. n0l Safety and Health Admin., Labor
1910.1000
Table Z-1--1Continued
stance
p/m*
mg./M
^v*^-**"*"5*' ............. ' l! T2.2*trrtmoroeth-
50
1,000 25
1,000
5 300
7,600 100
6,100
^rapnenyfrrutty*............-
100
1.5 0.1
3 560
NO.**................... ................ J
0.5 0.1
im Acrytomtrde------- ......... ............. ....... -.........-
Table Z-1--Continued
Substance
p/m*
mg./M *
Vinyt toluene.......................................
Xylene (xylol)....................................... Xylidine--Skm.....................................
100
100 5
<80 0.1 435 25
1
Zirconium compounds (as Zr)..........
5 5
'Parts of vapor or gas per million parts of contaminated as by volume at 25* C. and 760 mm. Hg pressure.
'Approximate milligrams of parbculate per cute meier of
air. (No footnote "c" is used to avoid contusion with ceding
value notations.) 'An atmospheric concentration of not more than 0.02
p.p.m., or personal protection may be necessary to avoid
headache. 'This 8 hour time weighted average is lor respirable dust
as measured by a vertical elutriator cotton dust sampler or
eQuivalent instrument. This time weighted a. -rage applies to the cotton wasie processing operations oi waste recycling (sorting, blending, cleaning, and wiilowing) and garnetting.
Table Z-2
Material
8-hour lime weighted average
Acceptable ceiling concentration
Acceptable maximum peak aouve the acceptance ceiling concentration lor an 6-
nour shift
Concentration
Mauumum duration
237.40-1969)............. 10 pp.m ....... terfen and berylturn com- 2 pg./M
tftil 1237.29-1970). ten luma (Z37.S-1970)----- 0.1 mg./M *................. tewn dust 237.5-1970)........ 0.2 mg./M'..... ........... ^SendsMfide (Z37.3-1968)-- 20 p.pm..................-- taler tauatfdonde 237.17- 10 p.p.m....................
SS7). >xc aod and chromates
>07 7-1971). 6we dbromide (237.31- 20 p.p.m......................
nr*
dertonde (Z37.21- 50 p.p.m......................
K9L
fswyde 237.18-1967)..... 3 p.p.m..........-............. -'59! fluoride (237.28- 3 p.p.m.... ....................
m.
(237.2-1966)...
* dust (237.28-1969).. 2.5 mg./M'____ (237.8-1971).................. ^ *onde (237.16-1969) -- 100 p.p.m___
chionde (Z37.23- 500 p.p.m-....
tafcyt) marcury (Z37.30- 0.01 mg./M*..
25 p.p.m...................... SO p.p.m .... 5 pg./M*...................... 25 ng./M*.
0.3 mg./M'.........-...... 0.6 mg./M*..........--.. 30 p.p.m..................... 25 p.p.m____________
100 p.p.m.................... 200 p.p.m....................
1 mg/IOM*...........--.
30 p.p.m....................... 50 p.p.m --
100 p.p.m--.................. 200 pp.m..
5 p.pjn______________ 10 p.p.m --
20 p.p.m____________ 50 p.p.m..............
1 mg./IOM*. 200 p.p.m.....
1,000 p.p.m...
0.04 mg./M*.
300 pp.m -- 2,000 p.p.m.
10 mmoles. 30 minuias.
30 minutes. 5 minutes m any 4
hours
5 minutes.
5 minutes in any 3 hours.
30 minute*.
10 minutes once only it no other measurable exposure occurs
5 rrvnutes m any 3 hours
5 minutes in any 2 hours
237,15-1989).
't^oethyiene (237.22-
. **7).
.^237.12-1967).--.......... v***thyiena (237.19-1967)
100 pp.m.... .
..... do........... ..
200 p.p.m...... 100 p.p.m --
200 p.p.m___
..... do.............
300 p.p.m...... 200 p p m___
600 p.p.m_______
300 p.p.m____ __
500 p.pm............. 300 p.p.m.............
5 nsnutes in any 3 hours.
5 minutes m any 3 hours.
10 minutes 5 minutes m ary 2
hour*
681
oc 1910.1001
29 CFR Ch. XVII (7.i^
!ena| Safety and Health Admin.r Labor
1910.1001
Table Z-3--Mineral Dusts
Substance
MppCf
Mg/M '
SAca: Crystalline: Ouartz (respirable)...........
250* lOmg/M *
%SO, + 5 Quartz (lota) dust).............
%SO,+2 30mg/M>
Cristobalrte: Use ft the value calculated from the count or mass formulae for quartz................................
Tndyrrute: Use Vi the value calculated from the formu lae for quartz.........................
Amorphous, including natural <4atomaceous earth........................
%SiO+2 20 SOmg/M *
%SO,
SiScates (less than 1% crystal line sibca): Mea............................................. Soapstone.................................. Talc (non-asbestos-form)____ Talc (fibrous). Use asbestos limit.......................................... Tremolite (see talc, fibrous).... Portland cement.......................
Graphite (natural)..................... ........ Coal dust (respsable traction
less than 5% SOJ......................
For more than 5% SiO,............. .....
20 20 20*
50 IS
2.4mg/M* or
lOmg/M*
Inert or Nuisance Dust Respirable fraction................... Total dust...................................
%SiO. + 2
15 6mg/M* 50 15mg/M'
Note: Conversion factors--mppctx 35.3=million particles per cube meter-particles per c.c.
Millions of particles per cubic fool of air, based on impinger samples counted by lighi-field technics
'The percentage of crystalline silica in the formula is the amount determined from air-bome samples, except in those instances in which other methods have been shown to be applicable.
"Both concentration and percent quartz for the appfication of this limit are to be determined from the fraction passing a size-selector with the following characteristics:
"Containing <1% quartz: if 1% quartz, use quartz Smit
Aerodynamic diameter (unit density sphere)
Percent passing selector
2 90 2.5 75 3.5 50 5.0 25 10 0
The measurements under this note refer to the use of an AEC instrument The respirable traction of coal dust is determined with s MAE: the figure corresponding to that of 2.4 Mg/M in the table for coal dust is 4.5 Mg/M1
[39 FR 23502. June 27. 1974. Redesignated and amended at 40 FR 23072. May 28, 1975; 42 FR 22525. May 3. 1977: 43 FR 2600, Jan. 17. 1978: 43 FR 5963. Feb. 10. 1978: 43 FR 13563, Mar. 31. 1978: 43 FR 19624. May 5.
1978; 43 FR 27394. June 23
45809. Oct_3, 1978; 43 FR
1978: 43 FR 57602, Dec. 8
32022. June 19. 1981: 49 fr
*'
11998844:: s5o0 fFrR 5511117733, rDwec. 13. uiV
41477. NOV. 17. 1986]
* **
61910.1001 Asbestos, tremolU. phylHte, and actinolite. ^
(a) Scope and application section applies to all occupy
posures to asbestos, tremoliteTr phyllite, and actinolite, In *2
tries covered by the Occur*
Safety and Health Act, except aT
vided in paragraph (a)(2) of t' tion.
(2) This section does not ant*
construction work as defined* *<
CFR 1910.12(b). (Exposure to tfftf tos, tremolite, anthophyllite, tJs'1
tinolite in construction work Is comb* by 29 CFR 1926.58.3
(b) Definitions. "Action level"
an airborne concentration of ash*** tremolite, anthophyllite, actinoJi**,^
a combination of these minerals. {4f
fiber per cubic centimeter (f/cc) ' calculated as an eight (8)--hour
weighted average.
"Asbestos" includes chrysotilv site, crocidolite, tremolite
anthophyllite asbestos, actinoll bestos, and any of these minerals
have been chemically treated
altered.
*
"Assistant Secretary" means sistant Secretary of Labor for Ocdfd
tional Safety and Health, UJ5.
ment of Labor, or designee.
j
"Authorized person" means
person authorized by the and required by work duties
present in regulated areas.
?
"Director" means the Director
the National Institute for Occupsj*?
al Safety and Health, U-S.
ment of Health and Human
or designee.
"Employee exposure" means *2
exposure to airborne asbestos, UWF
lite, anthophyllite, actinolite.
combination of these mineral
would occur if the employee wert
using respiratory protective 9
ment. "Fiber" means a particulate W* $
asbestos, tremolite, anthophy'1'r^j,
actinolite, 5 micrometers or
r
* 4 iength-to-diameter ratio of at
**T, ^.efficiency
* particulate
air
f'lter'' means a filter ciapable
^ oing and retaining at least 99.97
0.3 micrometer diameter ^Slsperse particles.
jated area" means an area es-
by the employer to demar9*"*[LaS where airborne concentra-
5. of asbestos, tremolite, anthoactinolite. or a combination
^Sesc minerals exceed, or can rea-
be expected to exceed, the {Xssible exposure limit.
^Tremolite, anthophyllite, or actino-
means the non-asbestos form of IJst minerals, and any of these min-
^ ^at have been chemically treat-
^ind/or altered.
i) Permissible exposure limit (PEL).
3* employer shall ensure that no em-
7ee is exposed to an airborne conoration of asbestos, tremolite, anth-
jpfcyllite, actinolite, or a combination
dihese minerals in excess of 0.2 fiber
jc cubic centimeter of air as an eight
labour time-weighted average (TWA)
m determined by the method pre-
cribed in Appendix A of this section,
x by an equivalent method.
4) Exposure monitoring.--(1) Gen-
rxl (i) Determinations of employee
apasure shall be made from breath-
tone air samples that are repre-
ctative of the 8-hour TWA of each
ydoyee.
Representative 8-hour TWA emScree exposures shall be determined
the basis of one or more samples
Resenting full-shift exposures for
shift for each employee in each
a classification in each work area.
J*] Initial monitoring, (i) Each em-
who has a workplace or work Ration covered by this standard.
as provided for in paragraphs **JXii) and (d)(2)(lii) of this section,
Zr* Perform initial monitoring of eraJg** who are, or may reasonably be
^p^ted to be exposed to airborne
^jsntrations at or above the action
Where the employer has moniafter December 20, 1985, and the ^iloring satisfies all other require-
of this section, the employer 7 rely on such earlier monitoring
results to satisfy the requirements of paragraph (d)(2)(i) of this section.
(iii) Where the employer has relied upon objective data that demonstrates that asbestos, tremolite, anthophyl lite, actinolite, or a combination of
these minerals is not capable of being released In airborne concentrations at or above the action level under the ex pected conditions of processing, use, or handling, then no initial monitoring is required.
(3) Monitoring frequency (periodic monitoring) and patterns. After the initial determinations required by
paragraph <d)(2)(i) of this section, samples shall be of such frequency and pattern as to represent with rea sonable accuracy the levels of expo
sure of the employees. In no case shall sampling be at intervals greater than six months for employees whose expo sures may reasonably be foreseen to exceed the action level.
(4) Changes in monitoring frequen cy. If either the initial or the periodic monitoring required by paragraphs (d)(2) and (d)(3) of this section statis tically indicates that employee expo sures are below the action level, the employer may discontinue the moni toring for those employees w'hose ex posures are represented by such moni
toring. (5) Additional monitoring. Notwith
standing the provisions of paragraphs (d)(2)(ii) and (d)(4) of this section, the employer shall institute the exposure monitoring required under paragraphs (d)(2)(i) and (d)(3) of this section whenever there has been a change in the production, process, control equip ment, personnel or work practices that may result in new or additional expo sures above the action level or when the employer has any reason to sus
pect that a change may result in new or additional exposures above the
action level. (6) Method of monitoring, (i) All
sararles taken to satisfy the monitor ing requirements of paragraph (d) shall be personal samples collected fol lowing the procedures specified in Ap
pendix A. (ii) All samples taken to satisfy the
monitoring requirements of paragraph (d) shall be evaluated using the OSHA Reference Method (ORM) specified in
682 683