Oil and Gas Occupational Safety and Health Regulations

11.23 (1) No employee shall be exposed to a concentration of

• (a) an airborne chemical agent, other than grain dust, in excess of the value for that chemical agent adopted by the American Conference of Governmental Industrial Hygienists in its publication entitled Threshold Limit Values and Biological Exposure Indices for 1986-1987;

• (b) airborne grain dust, respirable and non-respirable, in excess of 10 mg/m³; or

• (c) an airborne hazardous substance, other than a chemical agent, that is hazardous to the safety and health of the employee.

(2) Where there is a likelihood that the concentration of an airborne chemical agent may exceed the value referred to in paragraph (1)(a) or (b), the air shall be sampled and the concentration of the chemical agent determined by a qualified person by a test in accordance with

• (a) the standards set out by the American Conference of Governmental Industrial Hygienists in its publication entitled Manual of Analytical Methods Recommended For Sampling and Analysis of Atmospheric Contaminants, dated 1958;

• (b) the standards set out by the United States National Institute for Occupational Safety and Health in the NIOSH Manual of Analytical Methods, third edition, volumes 1 and 2, dated February 1984; or

• (c) a method set out in the United States Federal Register, volume 40, number 33, dated February 18, 1975, as amended by volume 41, number 53, dated March 17, 1976.

(3) A record of each test made pursuant to subsection (2) shall be kept by the employer at his place of business nearest to the work place where the air was sampled for two years after the date of the test.

(4) A record referred to in subsection (3) shall include

• (a) the date, time and location of the test;

• (b) the chemical agent for which the test was made;

• (c) the sampling and testing method used;

• (d) the result obtained; and

• (e) the name and occupation of the qualified person who made the test.