Document QgBkQ0521xbzMMY6GB5aEynX6
PLAINTIFF'S EXHIBIT
MON-2396
TLVs
Threshold Limit Values
for
Chemical Substances
and
Physical Agents
in the
Workroom Environmen v
Vwith
A'
Intended Changes
for
$1973
I
LAM021584
6113 18441
BCCC132
**
monitoring is essential for personnel control.
Radioactivity: For permissible concentra tions of radioisotopes in air, see U.S. De partment of Commerce, National Bureau of Standards Handbook 69, "Maximum Per missible Body Burdens and Maximum Per missible Concentrations of Radionuclides in Air and in Water for Occupational Expo sure," June 5, 1969. Also, see U.S. Depart ment of Commerce National Bureau of Standards, Handbook 59, "Permissible Dose from External Sources of Ionizing Radia tion," September 24, 1954, and addendum of April 15, 1958. A report, Basic Radiation Protection Criteria, published by the Na tional Committee on Radiation Protection, revises and modernizes the concept of the NCRP standards of 1954, 1957 and 1958; obtainable as NCRP Rept. No. 39, P.O. Box 4867, Washington, D.C. 20008.
MINERAL DUSTS
Substanc*
m.p.p.e.f.0
SILICA, SiOj
Crystalline
Quartz
TLV in mppcf: 300j)
% quartz -+- 10
TLV for respirable dust in mg/m':
10 mg/m
% Respirable quartz + 2
32
TLV for "total dust," res pirable and nonrespirable:
30 mg/'m' % quartz + 3
Cristobalite.........Use one-half the value cal culated from the count or mass formulae for quartz.
Tridymite
Use one-half the value calculated from formulae for quartz.
Silica, fused
Use quartz formulae.
Amorphous, includ ing natural diatomaceous earth........................ 20
SILICATES (< 1% quartz)
`Asbestos,all forms. Mica....................... Perlite.................... Portland Cement.. Soapstone.............. Talc (non-asbestiform).................. Talc (fibrous) use asbestos limit___ Tremolite (see Asbestos)........... Graphite (natural).
-- 20 30 30 20
20
--
-- 15
"1973 Addition. ' ""See Notice of Intended Changes for Mineral
Dusts.
33
B0CC;i93
LAM021585
6113 18442
*COAL DUST
(bituminous). 2 mg/m1 (respirabledust"'frac tion < 5% quartz). If > 5% quartz use respirable mass formula.
NUISANCE PARTICULATES
(see Appendix E)
30 m.p.p.c.f. or 10 mg/m1 of total dust <1% quartz
Conversion factors mppcf X 35.3 = million particles per cubic meter = particles per c.c.
i) Millions of particles per cubic foot of air, based on impinger samples counted by light-field technics.
j) The percentage of quartz in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.
k) Both concentration and percent quartz for the application of this limit are to be determined from the fraction pass ing a size-selector with the following characteristics:
Aerodynamic Diameter (nm) (unit density sphere)
<2 2.5 3.5 5.0 10
34
% passing selector 90 75 50 25 0
1) containing <1% quartz; if quartz con tent > 1%, use formulae for quartz.
p) see Page 39.
*1973 Addition.
35 LAM021586 j
B003194
i i
i
tional Committee on Radiation Protection, revises and modernizes the concept of the
XCRP standards of 1954, 1957 and 1958; obtainable as XCRP Rept. Xo. 39, P.O. Box 48G7, Washington, D.C. 20008.
MINERAL OUSTS
Substanc*
m.p.p.c.f.0
SILICA
Cristobalite, Crystalline.........
Use one-half the value cal culated from the count or mass formulae for quartz.
Amorphous, includ ing natural diatomaceous earth..................... 20
Quartz
TLV in mppcf: 300ij)
% quartz + 10
TLV for respirable dust in mg/m1:
10 mg/m'*' % Respirable quartz + 2
Silica, fused Tridymite
TLV for "total dust," res pirable and nonrespirable:
30 mg/m1 % quartz -+ 3
Use quartz formulae. Use one-half the value calculated from formulae for quartz.
30
MINERAL OUSTS
Subttanc*
m.p.p.c.f.0
SILICATES ( < 1% quartz)
"Asbestos, all types. Mica...................... Perlite.................... Portland Cement. . Soapstone.............. Talc (non-asbestiform)................. Talc (fibrous) use asbestos liniit---Tremolite (see Talc, fibrous)............... Graphite (natural).
20 30 30 20 20
15
NUISANCE PARTICULATES
(see Appendix E)
30 mp.p.p.c.f. or 10 mg/m1 of total dust <1% quartz
Conversion factors mppcf X 35.3 = million particles per cubic meter = particles per c.c.
i) Millions of particles per cubic foot of air, based on impinger samples counted by light-field technics.
j) The percentage of quartz in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable.
See Notice of Intended Changes for Mineral Ousts.
31
BC0G196
k) Both concentration and percent quartz for the application of this limit are to be determined from the fraction pass ing a size-selector with the following characteristics :
Aerodynamic Diameter (pm) (unit density sphere)
<2 2.5 3.5 5.0 10
% passing
90 75 50 25
0
1) containing <1% quartz; if quartz con tent >1%, use formulae for quartz.
32
NOTICE OF INTENDED CHANGES (for 1972)
These substances, with their correspond ing values, comprise those for which either a limit has been proposed for the first time, or for which a change in the "Adopted" listing has been proposed. In both cases, the proposed limits should be considered trial limits that will remain in the listing for a period of at least two years. If, after two years no evidence comes to light that ques tions the appropriateness of the values herein, the values will be reconsidered for the "Adopted" list. Documentation is available for each of these substances.
Substance
ppma> mg/M3j)
Acetaldehyde................. C Acetic anhydride...........
Ammonia........................ + Baygon...........................
Bismuth telluride........... Bismuth telluride (Se-
doped)........................ Butane............................ + Caprolactam (2-Oxo-
hexamethylenimine) Dust........................ Vapor......................
Carbofuran -- Skin........ Chloroform (trichloromethane)....................
+ bis-Chloromethyl ether.. + Chloromethyl ether........
100 5
25 --
--
_ 500
5 --
25 -- --
Capital letten refer to Appendices. +1972 Revision or Addition.
33
180 20 18 0.5 10
5 1,200
1 25 0.05
120 A1* A'
LAM021589
6113 18446