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Policies Part 5 Contents

CONTROLLING EXPOSURE

R5.48-1 RE: Chemical and Biological Substances - Occupational Exposure Limits
R5.54-1 RE: Chemical and Biological Substances - Controlling Exposure - Exposure Control Plan

Policies Part 5 - Controlling Exposure

Policy Item R5.48-1
RE: Occupational Exposure Limits

BACKGROUND
1. Explanatory Notes
Section 5.48 provides established limits for a worker's exposure to hazardous chemical substances. Generally, these exposure limits are established according to the Threshold Limit Values ("TLVs") adopted by the American Conference of Governmental Industrial Hygienists ("ACGIH"). However, the Board has authority to make exceptions and adopt occupational exposure limits for specific chemical substances that are not consistent with the TLVs established by the ACGIH. This policy sets out those exceptions.

2. The Regulation
Section 5.48:

Except as otherwise determined by the Board, the employer must ensure that no worker is exposed to a substance that exceeds the ceiling limit, short-term exposure limit, or 8-hour TWA limit prescribed by ACGIH.

Section 5.57:

(1) If a substance identified as any of the following is present in the workplace, the employer must replace it, if practicable, with a material which reduces the risk to workers:

(a) ACGIH A1 or A2, or IARC 1, 2A or 2B carcinogen;

(b) ACGIH reproductive toxin;

(c) ACGIH sensitizer;

(d) ACGIH L endnote.

(2) If it is not practicable to substitute a material which reduces the risk to workers, in accordance with subsection (1), the employer must implement an exposure control plan to maintain workers' exposure as low as reasonably achievable below the exposure limit established under section 5.48.

(3) The exposure control plan must meet the requirements of section 5.54.

3. Preamble to Policy
The following is a preamble to be applied to those exposure limits developed by the Board as an exception to the TLVs established by the ACGIH:

An exposure limit is a maximum allowed airborne concentration and is not intended to represent a fine line between safe and harmful conditions. In determining an exposure limit, it is not possible to take into account all factors that could influence the effect that exposure to the substance may have on an individual worker. Therefore, for all hazardous substances, regardless of any assigned exposure limit, the guiding principle is elimination of exposure or reduction to the lowest level that is reasonably achievable below the exposure limit.

Due to a wide variation in individual susceptibility, some workers may experience discomfort from some substances at concentrations at or below the exposure limit. Others may be affected more seriously by aggravation of a pre-existing condition, or by development of an occupational disease. Furthermore, other workplace contaminants may affect an individual's response. The effects of combined chemical exposures are often unknown or poorly defined.

POLICY
1. Table of Occupational Exposure Limits for Excluded Substances

As presented in the table below, the Board has determined exposure limits for the following specific substances, notwithstanding the TLVs established by the ACGIH.

Substance/Chemical Name CAS No. Unit 8-hour TWA Limit Short-term exposure Limit, STEL Ceiling Limit
ABATE (TEMEPHOS) TOTAL DUST 3383-96-8 mg/m3 10 20  
ACETAMIDE 60-35-5   No previous limit
ACETONE 67-64-1 ppm 250 500  
ACETONE CYANOHYDRIN 75-86-5 ppm     1
ACETYLENE 74-86-2   Simple asphyxiant
ALIPHATIC HYDROCARBON GASES, ALKANES [C1-C4]   ppm 1000    
ALLYL AMINE 107-11-9 ppm 2    
ALLYL BROMIDE 106-95-6   No previous limit
ARGON 7440-37-1   Simple asphyxiant
ATRAZINE 1912-24-9 mg/m3 5    
BARIUM SULFATE 7727-43-7 mg/m3 10 (N)    
BENZYL CHLORIDE 100-44-7 ppm     1
BORON TRIBROMIDE 10294-33-4 ppm     1
BORON TRICHLORIDE 10294-34-5 ppm No previous limit
BORON TRIFLUORIDE 7637-07-2 ppm     1
BROMOCHLOROMETHANE 74-97-5 ppm 200 250  
1-BROMOPROPANE 106-94-5 ppm 10    
BUTANE, ISOMERS:          
    n-BUTANE 106-97-8 ppm 600 750  
    ISOBUTANE 75-28-5   No previous limit
BUTENES, ALL ISOMERS, INCLUDING ISOBUTENE 106-98-9,
107-01-7,
590-18-1,
624-64-6,
25167-67-3,
115-11-7
  No previous limit
n-BUTYL ALCOHOL (n-BUTANOL) 71-36-3 ppm 15   30
n-BUTYL ACETATE 123-86-4 ppm 20    
sec-BUTYL ACETATE 105-46-4 ppm 200    
tert-BUTYL ACETATE 540-88-5 ppm 200    
n-BUTYL METHACRYLATE 97-88-1 ppm 50    
CADUSAFOS 95465-99-9   No previous limit
CALCIUM CARBONATE (incl. LIMESTONE, MARBLE), TOTAL DUST 1317-65-3 mg/m3 10 20  
CALCIUM SILICATE, naturally occurring as  WOLLASTONITE 1344-95-2 mg/m3 No previous limit
CALCIUM SILICATE, synthetic nonfibrous 1344-95-2 mg/m3 10 (E)(N)    
CAPROLACTAM DUST 105-60-2 mg/m3 1 3  
CAPTAFOL 2425-06-1 mg/m3 0.1    
CARBARYL 63-25-2 mg/m3 5    
CARBON DIOXIDE 124-38-9 ppm 5000 15000  
CARBON DISULFIDE 75-15-0 ppm 4 12  
CARBON MONOXIDE 630-08-0 ppm 25 100  
CARBON TETRACHLORIDE 56-23-5 ppm 2    
CHLOROACETIC ACID 79-11-8 ppm 0.3    
CHLOROBROMOMETHANE (see BROMOCHLOROMETHANE)          
1-CHLORO-1,1-DIFLUOROETHANE 75-68-3 ppm 1000    
CHLORODIFLUOROMETHANE 75-45-6 ppm 500 1250  
β-CHLOROPRENE 126-99-8 ppm 10    
CHLOROFORM 67-66-3 ppm 2    
CHLOROTRIFLUOROMETHANE 75-72-9 ppm 1000    
CHROMIUM, WATER SOLUBLE, Cr VI COMPOUNDS 7440-47-3 mg/m3 0.025   0.1
CITRAL, INHALABLE 5292-40-5   No Previous Limit
CLOPIDOL 2971-90-6 mg/m3 10    
CRESOL, ALL ISOMERS 1319-77-3,
95-48-7,
95-48-7,
108-39-4,
106-44-5
mg/m3 10    
CUMENE 98-82-8 ppm 25 75  
CYANOGEN 460-19-5 ppm 10    
CYANOGEN BROMIDE 506-68-3   No previous limit
DIBUTYL PHOSPHATE 107-66-4 ppm 1 2  
DICHLOROMETHANE 75-09-2 ppm 25    
DICYCLOHEXYLMETHANE-4,4'-DIISOCYANATE 5124-30-1 ppm 0.005   0.01
2,4-DICHLOROPHENOXYACETIC ACID AND ITS ESTERS 94-75-7 mg/m3 10 20  
DIELDRIN 60-57-1 mg/m3 0.25    
DIETHANOLAMINE 111-42-2 mg/m3 2    
DIETHYLENE GLYCOL MONOBUTYL ETHER 112-34-5   No previous limit
N,N-DIETHYLHYDROXYLAMINE 3710-84-7   No previous limit
DIISOCYANATES, N.O.S.   ppm 0.005   0.01
DIMETHOXYMETHANE 109-87-5 ppm 1000 1250  
DIMETHYL ETHER 115-10-6 ppm 1000    
DIMETHYL SULFATE 77-78-1 ppm     0.1
n-DIOCTYL PHTHALATE 117-84-0 mg/m3 5    
ENDOSULFAN 115-29-7 mg/m3 0.1    
ENFLURANE 13838-16-9 ppm 2    
EPICHLOROHYDRIN 106-89-8 ppm 0.1    
ETHYL ACETATE 141-78-6 ppm 150    
ETHYL ISOCYANATE 109-90-0   No previous limit
ETHYL METHACRYLATE 97-63-2 ppm 50    
ETHYL TERT-BUTYL ETHER 637-92-3 ppm 5    
ETHYLENE DIBROMIDE 106-93-4 ppm 0.5    
ETHYLENE DICHLORIDE (1,2-DICHLOROETHANE) 107-06-2 ppm 1 2  
ETHYLENE GLYCOL, AEROSOL 107-21-1 mg/m3     100 
ETHYLENE GLYCOL, PARTICULATE 107-21-1 mg/m3 10 20  
ETHYLENE GLYCOL, VAPOUR 107-21-1 ppm     50
ETHYLENEIMINE 151-56-4 ppm 0.5    
ETHYLENE OXIDE 75-21-8 ppm 0.1 1  
ETHYLIDENE NORBORNENE 16219-75-3 ppm     5
FLUORINE 7782-41-4 ppm 0.1    
FLUOROXENE 406-90-6 ppm 2    
FOLPET 133-07-3   No previous limit
FORMALDEHYDE 50-00-0 ppm 0.3   1
FURFURAL 98-01-1 ppm 2    
FURFURYL ALCOHOL 98-00-0 ppm 5 10  
GLYCERIN MIST, RESPIRABLE 56-81-5 mg/m3 3    
GYPSUM, TOTAL DUST 13397-24-5 mg/m3 10 20  
HALOTHANE 151-67-7 ppm 2    
HARD METALS, containing COBALT and TUNGSTEN CARBIDE, as Co 7440-48-4, 12070-12-1 mg/m3 No previous limit
HELIUM 7440-59-7   Simple asphyxiant
HEXAMETHYLENE DIISOCYANATE 822-06-0 ppm 0.005   0.01
n-HEXANE 110-54-3 ppm 20    
HEXANE, ALL ISOMERS except n-HEXANE   ppm 200    
HEXYLENE GLYCOL 107-41-5 ppm     25
HYDROGEN 1333-74-0   Simple asphyxiant
HYDROGEN FLUORIDE, as F 7664-39-3 ppm     2
HYDROGEN SULFIDE 7783-06-4 ppm     10
INDENE 95-13-6 ppm 10    
IODIDES     No previous limit
IODINE 7553-56-2 ppm     0.1
IRON OXIDE, FUME 1309-37-1 mg/m3 5 10  
IRON PENTACARBONYL 13463-40-6 ppm 0.01    
IRON SALTS, SOLUBLE, as Fe   mg/m3 1 2  
ISOBUTYL ACETATE 110-19-0 ppm 150    
ISOPHORONE DIISOCYANATE 4098-71-9 ppm 0.005   0.01
ISOPROPYL GLYCIDYL ETHER (IGE) 4016-14-2 ppm     50
LIQUIFIED PETROLEUM GAS 68476-85-7 ppm 1000 1250  
LITHIUM HYDRIDE 7580-67-8 mg/m3 0.025   1
LITHIUM HYDROXIDE 1310-65-2 mg/m3      
MAGNESIUM OXIDE, RESPIRABLE DUST AND FUME, as Mg 1309-48-4 mg/m3 3 10  
MALEIC ANHYDRIDE 108-31-6 ppm 0.1    
MANGANESE, ELEMENTAL AND INORGANIC COMPOUNDS, as Mn 7439-96-5 mg/m3 0.2    
MERCURY, ARYL COMPOUNDS 7439-97-6 mg/m3 0.05   0.1
MESITYL OXIDE 141-79-7 ppm 10 25  
METHOMYL 16752-77-5 mg/m3 2.5    
METHOXYFLURANE 76-38-0 ppm 2    
1-METHOXY-2-PROPANOL 107-98-2 ppm 50 75  
2-METHOXY-1-PROPANOL 1589-47-5 ppm 20 40  
1-METHOXYPROPYL-2-ACETATE 108-65-6 ppm 50 75  
2-METHOXYPROPYL-1-ACETATE 70657-70-4 ppm 20 40  
METHYLENE BISPHENYL ISOCYANATE 101-68-8 ppm 0.005   0.01
METHYLENE bis (4-CYCLOHEXYL-ISOCYANATE) 5124-30-1 ppm 0.005   0.01
4,4'-METHYLENEDIANILINE 101-77-9 ppm 0.01    
METHYL ETHYL KETONE (MEK) 78-93-3 ppm 50 100  
METHYL FORMATE 107-31-3 ppm 100 150  
METHYL ISOAMYL KETONE 110-12-3 ppm 50    
METHYL ISOCYANATE 624-83-9 ppm 0.02    
METHYL PARATHION 298-00-0 mg/m3 0.2    
METHYL PROPYL KETONE (2-PENTANONE) 107-87-9 ppm 150 250  
NAPTHALENE 91-20-3 ppm 10 15  
1,5-NAPHTHYLENE DIISOCYANATE 3173-72-6 ppm 0.005   0.01
NATURAL RUBBER LATEX, AS TOTAL PROTEINS, INHALABLE 9006-04-6 mg/m3 0.001    
NEON 7440-01-9   Simple asphyxiant
NICKEL, ELEMENTAL, SOLUBLE INORGANIC COMPOUNDS (NOS) 7440-02-0 mg/m3 0.05    
NICKEL, INSOLUBLE INORGANIC COMPOUNDS (NOS) 7440-02-0 mg/m3 0.05    
NICKEL CARBONYL 13463-39-3 ppm 0.001    
NITROGEN 7727-37-9   Simple asphyxiant
NITROGEN DIOXIDE 10102-44-0 ppm     1
2-NITROPROPANE 79-46-9 ppm 5    
NITROUS OXIDE 10024-97-2 ppm 25    
OIL MIST, MINERAL, MILDLY REFINED   mg/m3 0.2    
OIL MIST, MINERAL, SEVERELY REFINED   mg/m3 1    
OXALIC ACID, ANHYDROUS 144-62-7 mg/m3 1 2  
OXALIC ACID, DIHYDRATE 6153-56-6   No previous limit
PENTACHLOROPHENOL 87-86-5 mg/m3 0.5    
PENTANE, ALL ISOMERS 78-78-4; 109-66-0; 463-82-1 ppm 600    
2,4-PENTANEDIONE 123-54-6   No previous limit
PERACETIC ACID 79-21-0   No previous limit
PHENYL ISOCYANATE 103-71-9 ppm 0.005   0.01
PHENYL MERCAPTAN 108-98-5 ppm     0.1
PHTHALIC ANHYDRIDE 85-44-9 ppm 1    
o-PHTHALODINITRILE 91-15-6   No previous limit
PIPERAZINE AND ITS SALTS, as PIPERAZINE 110-85-0 mg/m3 0.3 1  
PIPERIDINE 110-89-4 ppm 1    
PLASTER OF PARIS, TOTAL DUST 26499-65-0 mg/m3 10 20  
PROPOXUR 114-26-1 mg/m3 0.5    
PROPYLENEIMINE 75-55-8 ppm 2    
RHODIUM, METAL AND INSOLUBLE COMPOUNDS, as Rh 7440-16-6 mg/m3 0.1 0.3  
RHODIUM, SOLUBLE COMPOUNDS, as Rh 7440-16-6 mg/m3 0.001 0.003  
SELENIUM AND COMPOUNDS, as Se 7782-49-2 mg/m3 0.1    
SILICA, AMORPHOUS:          
DIATOMACEOUS EARTH, UNCALCINED, TOTAL DUST 61790-53-2 mg/m3 4    
DIATOMACEOUS EARTH, UNCALCINED, RESPIRABLE DUST 61790-53-2 mg/m3 1.5    
PRECIPITATED SILICA and SILICA GEL, TOTAL DUST 112926-00-8 mg/m3 4    
PRECIPITATED SILICA and SILICA GEL, RESPIRABLE DUST 112926-00-8 mg/m3 1.5    
SILICA FUME, TOTAL DUST 69012-64-2 mg/m3 4    
SILICA FUME, RESPIRABLE DUST 69012-64-2 mg/m3 1.5    
SILICON TETRAHYDRIDE (SILANE) 7803-62-5 ppm 0.5 1  
SILVER AND COMPOUNDS, as Ag 7440-22-4 mg/m3 0.01 0.03  
SIMAZINE 122-34-9 mg/m3 No previous limit
STEARATES 57-11-4;
557-04-0;
557-05-1;
822-16-2
mg/m3 10 (J)    
STODDARD SOLVENT (MINERAL SPIRITS) 8052-41-3 mg/m3 290 580  
STYRENE 100-42-5 ppm 50 75  
SULFUR DIOXIDE 7446-09-5 ppm 2 5  
SULPROFOS 35400-43-2 mg/m3 1    
TANTALUM and TANTALUM OXIDE dusts, as Ta 7440-25-7 mg/m3 5    
1,1,1,2-TETRACHLORO-2,2-DIFLUOROETHANE 76-11-9 ppm 500    
1,1,2,2-TETRACHLORO-1,2-DIFLUOROETHANE 76-12-0 ppm 200    
TETRAETHYL LEAD, as Pb 78-00-2 mg/m3 0.075    
TETRAMETHYL LEAD, as Pb 75-74-1 mg/m3 0.075    
THIONYL CHLORIDE 7719-09-7 ppm     1
THIRAM 137-26-8 mg/m3 1    
2,4-TOLUENE DIISOCYANATE (TDI) 584-84-9 ppm 0.005   0.01
2,6-TOLUENE DIISOCYANATE 91-08-7 ppm 0.005   0.01
2,4- and 2,6-TOLUENE DIISOCYANATE AS A MIXTURE 584-84-9
91-08-7
ppm No previous limit
(see section 5.51, OHSR)
TRIBUTYL PHOSPHATE 126-73-8 ppm 0.2    
TRICHLOROACETIC ACID 76-03-9 ppm 1    
1,2,3-TRICHLOROPROPANE 96-18-4 ppm 10    
1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE 76-13-1 ppm 500 1250  
TRIETHYLAMINE 121-44-8 ppm 1 3  
TRIMELLITIC ANHYDRIDE 552-30-7 mg/m3     0.04
TRIMETHYL HEXAMETHYLENE DIISOCYANATE 28679-16-5 ppm 0.005   0.01
TRIORTHOCRESYL PHOSPHATE 78-30-8 mg/m3 0.1    
TRI-n-BUTYLTIN COMPOUNDS 688-73-3 mg/m3 0.05    
TUNGSTEN as W:          
    Metal and insoluble compounds 7440-33-7 mg/m3 5 10  
    Soluble compounds 7440-33-7 mg/m3 1 3  
URANIUM COMPOUNDS, NATURAL, SOLUBLE, as U 7440-61-1 mg/m3 0.05    
VEGETABLE OIL MIST, RESPIRABLE FRACTION, EXCEPT CASTOR, CASHEW NUT, OR SIMILAR IRRITATING OILS 8008-89-7 mg/m3 3    
VINYLIDENE CHLORIDE 75-35-4 ppm 1    
VINYL TOLUENE, ALL ISOMERS 25013-15-4 ppm 25 75  
WARFARIN 81-81-2 mg/m3 0.1    
WOOD DUST:          
    ALLERGENIC   mg/m3 1    
    NON-ALLERGENIC, HARDWOOD   mg/m3 1    
    NON-ALLERGENIC, SOFTWOOD   mg/m3 2.5    
ZINC STEARATE, TOTAL DUST 557-05-1 mg/m3 10 20  

(E) = the value is for particulate matter containing no asbestos and less than 1% crystalline silica

(N) = the 8-hour TWA listed in the Table is for the total dust. The substance also has an 8-hour TWA of 3 mg/m3 for the respirable fraction

2. Dusts
The Board categorizes particulates that are insoluble or poorly soluble in water and do not cause toxic effects other than by inflammation or the mechanism of "lung overload", as "nuisance dusts".

A "nuisance dust" will have an exposure limit or TLV of 10 mg/m3 for total particulate. It is recognized that the respirable fraction of "nuisance dusts" may also be measured. The equivalent exposure limit for respirable particulate is 3 mg/m3. Respirable particulate refers to the fraction of inhaled dust that is capable of passing through the upper respiratory tract to the gas exchange region of the lung. Total particulate refers to a wide range of particle sizes capable of being deposited in the various regions of the respiratory tract.


EFFECTIVE DATE: June 1, 2017
AUTHORITY: s. 5.48, Occupational Health and Safety Regulation
CROSS REFERENCES:
HISTORY: Effective June 1, 2017, housekeeping changes were made to add the following substances to the Table of Occupational Exposure Limits for Excluded Substances in accordance with the OEL review and adoption procedure:
ACETAMIDE FOLPET
ISOBUTANE FURFURAL
CADUSAFOS HEXYLENE GLYCOL
CAPTAFOL PHTHALIC ANHYDRIDE
β-CHLOROPRENE STEARATES
ETHYLENE GLYCOL (AEROSOL) TUNGSTEN as W, metal and insoluble compounds; soluble compounds

Effective July 15, 2016, housekeeping changes were made to add the following substances to the Table of Occupational Exposure Limits for Excluded Substances in accordance with the OEL review and adoption procedure.
BORON TRIBROMIDE HARD METALS, containing COBALT and TUNGSTEN CARBIDE as Co
BORON TRICHLORIDE ISOBUTYL ACETATE
BORON TRIFLUORIDE PROPOXUR
SEC-BUTYL ACETATE SIMAZINE
TERT-BUTYL ACETATE TOLUENE DIISOCYANATE, 2,4- and 2,6- as a mixture

CALCIUM SILICATE, naturally occurring as WOLLASTONITE

CALCIUM SILICATE, synthetic nonfibrous

TRIORTHOCRESYL PHOSPHATE
CYANOGEN WARFARIN

Effective May 1, 2015, changes were made to add the following substances to the Table of Occupational Exposure Limits for Excluded Substances:
ACETYLENE OXALIC ACID, ANHYDROUS and DIHYDRATE
CYANOGEN BROMIDE (NEW TLV) 1,2,3-TRICHLOROPROPANE
LITHIUM HYDRIDE TRIETHYLAMINE
METHYL FORMATE  

Effective February 1, 2015, changes were made to remove eight substances from the Table of Occupational Exposure Limits for Excluded Substances:
BERYLLIUM AND COMPOUNDS ALPHA-METHYL STYRENE
CARBONYL SULFIDE NONANE
DIACETYL PORTLAND CEMENT
ETHYL FORMATE VANADIUM PENTOXIDE

On April 7, 2014 changes were made to correct the exposure limit for Ethylidene norbornene.

Effective April 1, 2014, changes were made to add 17 substances to the Table of Occupational Exposure Limits for Excluded Substances:

ARGON METYHL ISOCYANATE
ATRAZINE NAPTHALENE
BARIUM SULFATE NEON
1-BROMOPROPANE NITROGEN
ETHYLIDENE NORBORNENE PENTACHLOROPHENOL
ETHYL ISOCYANATE PENTANE, all isomers
HELIUM PERACETIC ACID
HYDROGEN TRICHLOROACETIC ACID
METHOMYL  

Effective May 1, 2013, changes were made to add eight substances to the Table of Occupational Exposure Limits for Excluded Substances:

ALIPHATIC HYDROCARBON GASES, ALKANES [C1-C4]
CLOPIDOL
DIETHYLENE GLYCOL MONOBUTYL ETHER
N,N-DIETHYLHYDROXYLAMINE
ETHYL TERT-BUTYL ETHER
MANGANESE, elemental and inorganic compounds, as Mn
METHYL ISOAMYL KETONE
TRIBUTYL PHOSPHATE

Effective April 10, 2012, changes were made to add six substances to the Table of Occupational Exposure Limits for Excluded Substances:

ALLY BROMIDE CARBONYL SULFIDE
DIACETYL ETHYL FORMATE
o-PHTHALODINITRILE NONANE

CAS No for piperazine and its salts was corrected from 142-64-3 to 110-85-0.

Housekeeping change effective October 14, 2011 to correct the reference to section 5.57 of the regulation. This is not a substantive change.

Effective September 15, 2011, changes were made to remove seven substances from the Table of Occupational Exposure Limits for Excluded Substances:

ACETIC ANHYDRIDE CARBON BLACK
ETHYL BENZENE METHYL ISOPROPYL KETONE
SOAPSTONE SOAPSTONE, RESPIRABLE
4,4' THIOBIS (6-tert-butyl-m-CRESOL)  

Effective June 1, 2011, changes were made to remove three substances from the Table of Occupational Exposure Limits for Excluded Substances:

COTTON DUST, raw METHYL ISOBUTYL KETONE
THALLIUM AND SOLUBLE COMPOUNDS  


Housekeeping changes effective June 1, 2011, to replace "exposure level" with "exposure limit" in Item 3 of the Background of this Policy. These changes also add 2,4-Pentanedione to the Table of Occupational Exposure Limits for Excluded Substances pursuant to the Occupational Exposure Limit review and adoption procedure approved by the Board of Directors at their March 2010 meeting.

Housekeeping changes effective April 19, 2011 in accordance with the new Occupational Exposure Limit review and adoption procedure approved by the Board of Directors at their March 2010 meeting. The changes add seven substances to the Table of Occupational Exposure Limits for Excluded Substances:

ACETIC ANHYDRIDE CARBON BLACK
ETHYL BENZENE MALEIC ANHYDRIDE
METHYL ISOPROPYL KETONE SOAPSTONE
4,4' THIOBIS (6-tert-butyl-m-CRESOL)  

Housekeeping changes effective September 15, 2010 to update regulation reference, delete practice reference, and make formatting changes.

The Table of Occupational Exposure Limits for Excluded Substances has been amended to include 18 substances for which the Board of Directors has made an exception to the adoption of these substances for which the American Conference of Governmental Industrial Hygienists changed the Threshold Limit Values in 2008 and 2009. The effect of this amendment is that the substances will be re-assigned the OELs that were in effect prior to the revision by ACGIH. The Table of Occupational Exposure Limits for Excluded Substances has been amended to delete two substances so the more protective American Conference of Governmental Industrial Hygienists Threshold Limit Values will now apply to these substances. The revisions were made to the Table effective September 1, 2010.

The Table of Occupational Exposure Limits for Excluded Substances has been amended to include new or revised substances for which the American Conference of Governmental Industrial Hygienists has changed the Threshold Limit Values in 2010. The effect of this amendment was that the existing occupational exposure limits for these substances continue to be in effect. These substances were added to the Table effective April 1, 2010.

This item was originally developed to implement the amendments made to the Occupational Health and Safety Regulation, effective October 29, 2003 pertaining to occupational exposure limits. A review of the policy was conducted to ensure that all substances for which an exception was warranted were listed, and there was no duplication with the information provided by the ACGIH.

APPLICATION: Each amendment of this policy applies to incidents occurring on and after the effective date of the amendment. If a decision made before the amendment effective date is within the appeal period, at Review Division, or at WCAT, it remains subject to the policy in effect at the time of the incident.

Policy Item R5.54-1 RE: Chemical and Biological Substances - Controlling Exposure - Exposure Control Plan

BACKGROUND
1. Explanatory Notes
Section 5.54 sets out the requirement for an exposure control plan in certain circumstances and the necessary elements if an exposure control plan is required. Among those elements is health monitoring under section 5.54(2)(f).

2. The Regulation
Section 5.54:

(1) An exposure control plan must be implemented when

(a) exposure monitoring under section 5.53(3) indicates that a worker is or may be exposed to an air contaminant in excess of 50% of its exposure limit,

(b) measurement is not possible at 50% of the applicable exposure limit, or

(c) otherwise required by this Regulation.

(2) The exposure control plan must incorporate the following elements:

(a) a statement of purpose and responsibilities;

(b) risk identification, assessment and control;

(c) education and training;

(d) written work procedures, when required;

(e) hygiene facilities and decontamination procedures, when required;

(f) health monitoring, when required;

(g) documentation, when required.

(3) The plan must be reviewed at least annually and updated as necessary by the employer, in consultation with the joint committee or the worker health and safety representative, as applicable.

POLICY
At the request of persons outside the Board or Board staff, the Board may arrange for samples to be analyzed as part of a health monitoring program under section 5.54(2)(f). The Board will have the results organized into broad categories of body burden levels and reported to the person who made the request and to Board staff and industry representatives concerned with the particular program.

The actual body burden levels of individuals are confidential and will only be revealed to a worker if the worker inquires, and to anyone else with the worker's written authorization. Questions regarding specific analysis results should be referred to the Board staff concerned with the particular program.


EFFECTIVE DATE: April 1, 2001
AUTHORITY: s. 5.54(2)(f), Occupational Health and Safety Regulation
CROSS REFERENCES:
HISTORY: Housekeeping changes effective September 15, 2010 to delete practice reference and make formatting changes.
Replaces Policy No. 13.01(6) of the Prevention Division Policy and Procedure Manual
APPLICATION: This Item results from the 2000/2001 "editorial" consolidation of all prevention policies into the Prevention Manual. The POLICY in this Item merely continues the substantive requirements of Policy No. 13.01(6), as they existed prior to the Effective Date, with any wording changes necessary to reflect legislative and regulatory changes since Policy No. 13.01(6) was issued.

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