1915.1000—Air contaminants.
Wherever this section applies, an employees's exposure to any substance listed in Table Z—Shipyards of this section shall be limited in accordance with the requirements of the following paragraphs of this section.
(a)
(1) Substances with limits preceded by “C”—Ceiling values.
An employee's exposure to any substance in Table Z—Shipyards, the exposure limit of which is preceded by a “C,” shall at no time exceed the exposure limit given for that substance. If instantaneous monitoring is not feasible, then the ceiling shall be assessed as a 15-minute time weighted average exposure which shall not be exceeded at any time over a working day.
(2) Other Substances—8-hour Time Weighted Averages.
An employee's exposure to any substance in Table Z—Shipyards, the exposure limit of which is not preceded by a “C,” shall not exceed the 8-hour Time Weighted Average given for that substance in any 8-hour work shift of a 40-hour work week.
(d) Computation formula.
The computation formula which shall apply to employee exposure to more than one substance for which 8-hour time weighted averages are listed in subpart Z of 29 CFR part 1915 in order to determine whether an employee is exposed over the regulatory limit is as follows:
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Where:
E is the equivalent exposure for the working shift.
C is the concentration during any period of time T where the concentration remains constant.
T is the duration in hours of the exposure at the concentration C.
The value of E shall not exceed the 8-hour time weighted average specified in subpart Z of 29 CFR part 1915 for the material involved.
(ii)
To illustrate the formula prescribed in paragraph (d)(1)(i) of this section, assume that Substance A has an 8-hour time weighted average limit of 100 ppm noted in Table Z—Shipyards. Assume that an employee is subject to the following exposure:
Two hours exposure at 150 p/m
Two hours exposure at 75 p/m
Four hours exposure at 50 p/m
Substituting this information in the formula, we have
(2×150 2×75 4×50)÷8=81.25 p/m
Since 81.25 ppm is less than 100 ppm, the 8-hour time weighted average limit, the exposure is acceptable.
(2)
(i)
in case of a mixture of air contaminants an employer shall compute the equivalent exposure as follows:
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Where:
Em is the equivalent exposure for the mixture.
C is the concentration of a particular contaminant.
L is the exposure limit for that substance specified in subpart Z of 29 CFR part 1915.
The value of Em shall not exceed unity (1).
(ii)
To illustrate the formula prescribed in paragraph (d)(2)(i) of this section, consider the following exposures:
| Substance | Actual concentration of 8 hour exposure (ppm) | 8 hr. TWA PEL (ppm) |
|---|---|---|
| B | 500 | 1000 |
| C | 45 | 200 |
| D | 40 | 200 |
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| Substituting in the formula, we have: | ||
| Em=500÷1,000 45÷200 40÷200 | ||
| Em=0.500 0.225 0.200 | ||
| Em=0.925 | ||
Since Em is less than unity (1), the exposure combination is within acceptable limits.
| Substance | CAS No. d | ppm a,* | mg/m 3,b,* | Skin Designation |
|---|---|---|---|---|
| Abate; see Temephos | ||||
| Acetaldehyde | 75-07-0 | 200 | 360 | — |
| Acetic acid | 64-19-7 | 10 | 25 | — |
| Acetic anhydride | 108-24-7 | 5 | 20 | — |
| Acetone | 67-64-1 | 1000 | 2400 | — |
| Acetonitrile | 75-05-8 | 40 | 70 | — |
| 2-Acetylaminofluorine; see § 1915.1014 | 53-96-3 | |||
| Acetylene | 74-86-2 | E | ||
| Acetylene dichloride; see 1,2-Dichloroethylene | ||||
| Acetylene tetrabromide | 79-27-6 | 1 | 14 | — |
| Acrolein | 107-02-8 | 0.1 | 0.25 | — |
| Acrylamide | 79-06-1 | — | 0.3 | X |
| Acrylonitrile; see § 1915.1045 | 107-13-1 | |||
| Aldrin | 309-00-2 | — | 0.25 | X |
| Allyl alcohol | 107-18-6 | 2 | 5 | X |
| Allyl chloride | 107-05-1 | 1 | 3 | — |
| Allyl glycidyl ether (AGE) | 106-92-3 | (C)10 | (C)45 | — |
| Allyl propyl disulfide | 2179-59-1 | 2 | 12 | — |
| alpha-Alumina | 1344-28-1 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Aluminum, (as Al) Metal | 7429-90-5 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Alundum; see alpha-Alumina | ||||
| 4-Aminodiphenyl; see § 1915.1011 | 92-67-1 | |||
| 2-Aminoethanol; see Ethanolamine | ||||
| 2-Aminopyridine | 504-29-0 | 0.5 | 2 | — |
| Ammonia | 7664-41-7 | 50 | 35 | — |
| Ammonium sulfamate | 7773-06-0 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| n-Amyl acetate | 628-63-7 | 100 | 525 | — |
| sec-Amyl acetate | 626-38-0 | 125 | 650 | — |
| Aniline and homologs | 62-53-3 | 5 | 19 | X |
| Anisidine (o-, p-isomers) | 29191-52-4 | — | 0.5 | X |
| Antimony and compounds (as Sb) | 7440-36-0 | — | 0.5 | — |
| ANTU (alpha Naphthylthiourea) | 86-88-4 | — | 0.3 | — |
| Argon | 7440-37-1 | E | ||
| Arsenic, inorganic compounds (as As); see § 1915.1018 | 7440-38-2 | — | — | — |
| Arsenic, organic compounds (as As) | 7440-38-2 | — | 0.5 | — |
| Arsine | 7784-42-1 | 0.05 | 0.2 | — |
| Asbestos; see 1915.1001 | ||||
| Azinphos-methyl | 86-50-0 | — | 0.2 | X |
| Barium, soluble compounds (as Ba) | 7440-39-3 | — | 0.5 | — |
| Barium sulfate | 7727-43-7 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Benomyl | 17804-35-2 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Benzene g; see § 1915.1028 | 71-43-2 | |||
| Benzidine; see § 1915.1010 | 92-87-5 | |||
| p-Benzoquinone; see Quinone | ||||
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| Benzo(a)pyrene; see Coal tar pitch volatiles | ||||
| Benzoyl peroxide | 94-36-0 | — | 5 | — |
| Benzyl chloride | 100-44-7 | 1 | 5 | — |
| Beryllium and beryllium compounds (as Be) | 7440-41-7 | — | 0.002 | — |
| Biphenyl; see Diphenyl | ||||
| Bismuth telluride, Undoped | 1304-82-1 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Bisphenol A; see Diglycidyl ether | ||||
| Boron oxide | 1303-86-2 | |||
| Total dust | — | 15 | — | |
| Boron tribromide | 10294-33-4 | 1 | 10 | — |
| Boron trifluoride | 7637-07-2 | (C)1 | (C)3 | — |
| Bromine | 7726-95-6 | 0.1 | 0.7 | — |
| Bromine pentafluoride | 7789-30-2 | 0.1 | 0.7 | — |
| Bromoform | 75-25-2 | 0.5 | 5 | X |
| Butadiene (1,3-Butadiene); see 29 CFR 1910.1051 ; 29 CFR 1910.19(l) | 106-99-0 | 1ppm/5 ppm STEL | — | — |
| Butanethiol; see Butyl mercaptan | ||||
| 2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 | 590 | — |
| 2-Butoxyethanol | 111-76-2 | 50 | 240 | X |
| n-Butyl-acetate | 123-86-4 | 150 | 710 | — |
| sec-Butyl acetate | 105-46-4 | 200 | 950 | — |
| tert-Butyl acetate | 540-88-5 | 200 | 950 | — |
| n-Butyl alcohol | 71-36-3 | 100 | 300 | — |
| sec-Butyl alcohol | 78-92-2 | 150 | 450 | — |
| tert-Butyl alcohol | 75-65-0 | 100 | 300 | — |
| Butylamine | 109-73-9 | (C)5 | (C)15 | X |
| tert-Butyl chromate (as CrO3); see 1915.1026 n | 1189-85-1 | |||
| n-Butyl glycidyl ether (BGE) | 2426-08-6 | 50 | 270 | — |
| Butyl mercaptan | 109-79-5 | 0.5 | 1.5 | — |
| p-tert-Butyltoluene | 98-51-1 | 10 | 60 | — |
| Cadmium dust fume (as Cd); see 1915.1027 | 7440-43-9 | — | — | — |
| Calcium carbonate | 1317-65-3 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Calcium hydroxide | 1305-62-0 | — | — | — |
| Calcium hydroxide | ||||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Calcium oxide | 1305-78-8 | — | 5 | — |
| Calcium silicate | 1344-95-2 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Calcium sulfate | 7778-18-9 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Camphor, synthetic | 76-22-2 | — | 2 | — |
| Carbaryl (Sevin) | 63-25-2 | — | 5 | — |
| Carbon black | 1333-86-4 | — | 3.5 | — |
| Carbon dioxide | 124-38-9 | 5000 | 9000 | — |
| Carbon disulfide | 75-15-0 | 20 | 60 | X |
| Carbon monoxide | 630-08-0 | 50 | 55 | — |
| Carbon tetrachloride | 56-23-5 | 10 | 65 | X |
| Cellulose | 9004-34-6 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
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| Chlordane | 57-74-9 | — | 0.5 | X |
| Chlorinated camphene | 8001-35-2 | — | 0.5 | X |
| Chlorinated diphenyl oxide | 55720-99-5 | — | 0.5 | — |
| Chlorine | 7782-50-5 | 1 | 3 | — |
| Chlorine trifluoride | 7790-91-2 | (C)0.1 | (C)0.4 | — |
| Chloroacetaldehyde | 107-20-0 | (C)1 | (C)3 | — |
| a-Chloroacetophenone (Phenacyl chloride) | 532-27-4 | 0.05 | 0.3 | — |
| Chlorobenzene | 108-90-7 | 75 | 350 | — |
| o-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | — |
| Chlorobromomethane | 74-97-5 | 200 | 1050 | — |
| 2-Chloro-1,3-butadiene; see beta-Chloroprene | ||||
| Chlorodiphenyl (42% Chlorine) (PCB) | 53469-21-9 | — | 1 | X |
| Chlorodiphenyl (54% Chlorine) (PCB) | 11097-69-1 | — | 0.5 | X |
| 1-Chloro,2,3-epoxypropane; see Epichlorohydrin | ||||
| 2-Chloroethanol; see Ethylene chlorohydrin | ||||
| Chloroethylene; see Vinyl chloride | ||||
| Chloroform (Trichloromethane) | 67-66-3 | 50 | 240 | — |
| bis(Chloromethyl) ether; see § 1915.1008 | 542-88-1 | |||
| Chloromethyl methyl ether; see § 1915.1006 | 107-30-2 | |||
| 1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | — |
| Chloropicrin | 76-06-2 | 0.1 | 0.7 | |
| beta-Chloroprene | 126-99-8 | 25 | 90 | X |
| 2-Chloro-6-(trichloromethyl) pyridine | 1929-82-4 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Chromium (II) compounds | ||||
| (as Cr) | 7440-47-3 | — | 0.5 | — |
| Chromium (III) compounds | ||||
| (as Cr) | 7440-47-3 | — | 0.5 | — |
| Chromium (VI) compounds; see 1915.1026 o | ||||
| Chromium metal and insol. salts (as Cr) | 7440-47-3 | — | 1 | — |
| Chrysene; see Coal tar pitch volatiles | ||||
| Clopidol | 2971-90-6 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene | 65966-93-2 | — | 0.2 | — |
| Cobalt metal, dust, and fume (as Co) | 7440-48-4 | — | 0.1 | — |
| Copper | 7440-50-8 | |||
| Fume (as Cu) | — | 0.1 | — | |
| Dusts and mists (as Cu) | — | 1 | — | |
| Corundum; see Emery | ||||
| Cotton dust (raw) | — | 1 | ||
| Crag herbicide (Sesone) | 136-78-7 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Cresol, all isomers | 1319-77-3 | 5 | 22 | X |
| Crotonaldehyde | 123-73-9; | 2 | 6 | |
| 4170-30-3 | ||||
| Cumene | 98-82-8 | 50 | 245 | X |
| Cyanides (as CN) | Varies with Compound | — | 5 | — |
| Cyanogen | 460-19-5 | 10 | — | — |
| Cyclohexane | 110-82-7 | 300 | 1050 | — |
| Cyclohexanol | 108-93-0 | 50 | 200 | — |
| Cyclohexanone | 108-94-1 | 50 | 200 | — |
| Cyclohexene | 110-83-8 | 300 | 1015 | — |
| Cyclonite | 121-82-4 | — | 1.5 | X |
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| Cyclopentadiene | 542-92-7 | 75 | 200 | — |
| 2,4-D (Dichlorophenoxyacetic acid) | 94-75-7 | — | 10 | — |
| Decaborane | 17702-41-9 | 0.05 | 0.3 | X |
| Demeton (Systox) | 8065-48-3 | — | 0.1 | X |
| Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 | 240 | — |
| 1,2-Diaminoethane; see Ethylenediamine | ||||
| Diazomethane | 334-88-3 | 0.2 | 0.4 | — |
| Diborane | 19287-45-7 | 0.1 | 0.1 | — |
| 1,2-Dibromo-3-chloropropane (CBCP); see § 1915.1044 | 96-12-8 | — | ||
| 1,2-Dibromoethane; see Ethylene dibromide | ||||
| Dibutyl phosphate | 107-66-4 | 1 | 5 | — |
| Dibutyl phthalate | 84-74-2 | — | 5 | — |
| Dichloroacetylene | 7572-29-4 | (C)0.1 | (C)0.4 | — |
| o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | — |
| p-Dichlorobenzene | 106-46-7 | 75 | 450 | — |
| 3,3′-Dichlorobenzidine; see § 1915.1007 | 91-94-1 | |||
| Dichlorodifluoromethane | 75-71-8 | 1000 | 4950 | — |
| 1,3-Dichloro-5,5-dimethyl hydantoin | 118-52-5 | — | 0.2 | — |
| Dichlorodiphenyltrichloroethane (DDT) | 50-29-3 | — | 1 | X |
| 1,1-Dichloroethane | 75-34-3 | 100 | 400 | — |
| 1,2-Dichloroethane; see Ethylene dichloride | ||||
| 1,2-Dichloroethylene | 540-59-0 | 200 | 790 | — |
| Dichloroethyl ether | 111-44-4 | (C)15 | (C)90 | X |
| Dichloromethane; see Methylene chloride | ||||
| Dichloromonofluoromethane | 75-43-4 | 1000 | 4200 | — |
| 1,1-Dichloro-1-nitroethane | 594-72-9 | (C)10 | (C)60 | — |
| 1,2-Dichloropropane; see Propylene dichloride | ||||
| Dichlorotetrafluoroethane | 76-14-2 | 1000 | 7000 | — |
| Dichlorvos (DDVP) | 62-73-7 | — | 1 | X |
| Dicyclopentadienyl iron | 102-54-5 | |||
| Total dust | — | 15 | — | |
| Respirable fraction | — | 5 | — | |
| Dieldrin | 60-57-1 | — | 0.25 | X |
| Diethylamine | 109-89-7 | 25 | 75 | — |
| 2-Diethylaminoethanol | 100-37-8 | 10 | 50 | — |
| Diethylene triamine | 111-40-0 | (C)10 | (C)42 | X |
| Diethyl ether; see Ethyl ether | ||||
| Difluorodibromomethane | 75-61-6 | 100 | 860 | — |
| Diglycidyl ether (DGE) | 2238-07-5 | (C)0.5 | (C)2.8 | — |
| Dihydroxybenzene; see Hydroquinone | ||||
| Diisobutyl ketone | 108-83-8 | 50 | 290 | — |
| Diisopropylamine | 108-18-9 | 5 | 20 | X |
| 4-Dimethylaminoazobenzene; see § 1915.1015 | 60-11-7 | |||
| Dimethoxymethane; see Methylal | ||||
| Dimethyl acetamide | 127-19-5 | 10 | 35 | X |
| Dimethylamine | 124-40-3 | 10 | 18 | — |
| Dimethylaminobenzene; see Xylidine | ||||
| Dimethylaniline (N,N-Dimethylaniline) | 121-69-7 | 5 | 25 | X |
| Dimethylbenzene; see Xylene | ||||
| Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate | 300-76-5 | — | 3 | — |
| Dimethylformamide | 68-12-2 | 10 | 30 | X |
| 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone | ||||
| 1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | X |
| Dimethylphthalate | 131-11-3 | — | 5 | — |
| Dimethyl sulfate | 77-78-3 | 1 | 5 | X |
| Dinitrobenzene (all isomers) | 1 | X | ||
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