see

D; GOVERNMENT REGULATIONS
(a) PRESENT REGULATIONS

The British Columbia Department of Mines and Petroleum Resources
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has adopted the following standard for permissible exposure to airborne

concentrations of asbestos fibre standard:

"The permissible occupational exposure to airborne
asbestos fibre shall not exceed 5 fibres longer than
5 microns per cubic centimetre (milliliter) of air
and will be calculated on an 8 hour time weighted
average (T.W.A.) of the sampling results in the

active working areas.

The Threshold Limit Value (T.L.V.) permissible
exposure standard of 5 fibres per milliliter should

be reached by January 1, 1976."
(b) FUTURE REGULATIONS?

In July 1976 the standard was changed to the following in the

United States:

"The 8 hour time weighted average airborne concentrations
of asbestos fibres to which any employee may be exposed
shall not exceed 2 fibres longer than 5 micrometers per

cubic centimeter of air as determined by the..."

"Ceiling concentration. No employee shall be exposed
at any time to airborne concentrations of asbestos fibres
in excess of 10 fibres longer than 5 micrometers per cubic

centimeter as determined by..."

Indications are the Department of Mines of British Columbia will regulate a

2 fibres/cc standard. As to the specifics of this standard, we have not beén

advised...T.W.A./ - ceiling? The Quebec Asbestos Mining Association has

proposed the following parameters to the government: