Asbestos Mines and Mills Release Regulations — 3
3 (1) The concentration of asbestos fibres contained in any gases that the owner or operator of a mine or mill may release into the ambient air from (a) crushing, drying or milling operations, (b) dry rock storage, or (c) primary dry drilling operations in an open pit at that mine or mill, shall not exceed two asbestos fibres per normal cubic centimetre of the gases. (2) The concentration of asbestos fibres referred to in paragraph (1)(a) or (b) shall be measured dry and undiluted, under normal operating conditions, in accordance with the applicable method described in Standard Reference Methods for Source Testing: Measurements of Emissions of Asbestos from Mining and Milling Operations ; Department of Fisheries and Environment Report EPS-1-AP-75-1 dated December 1976, as amended from time to time. (3) The concentration of asbestos fibres referred to in paragraph (1)(c) shall be measured dry and undiluted, under normal operating conditions, in accordance with the method described in Standard Reference Methods for Source Testing: Measurement of Emissions of Asbestos from Asbestos Mining and Milling Operations Method S-3 Sampling of Drill Baghouse Exhaust Emissions , Department of Fisheries and the Environment Canada Report EPS-1-AP-75-1A dated March 1978, as amended from time to time. (4) Where Method S.1 described in the Report referred to in subsection (2) is used, (a) three release measurements shall be made; (b) each release measurement shall be made during a minimum continuous process operational period of 30 minutes; (c) the asbestos fibres on each filter shall be counted by two qualified persons, one counting the odd numbered sectors and the other counting the even numbered sectors; (d) each release measurement shall be determined by taking the arithmetic average of the two sets of fibre counts conducted in accordance with paragraph (c); and (e) the concentration of asbestos fibres contained in gases released into the ambient air shall be the arithmetic average of the three measurements conducted in accordance with paragraphs (a) to (d). (5) Where Method S.2 described in the Report referred to in subsection (2) is used, (a) one release measurement shall be made; (b) the asbestos fibres on each filter shall be counted by two qualified persons, one counting the odd numbered sectors and the other counting the even numbered sectors; and (c) the release measurement shall be determined by taking the arithmetic average of the two sets of fibre counts conducted in accordance with paragraph (b). (6) Where Method S.3 described in the Report referred to in subsection (3) is used, (a) three release measurements shall be made; (b) each release measurement shall be made during a period of continuous active drilling; (c) the asbestos fibres on each filter shall be counted by two qualified persons, one counting the odd numbered sectors and the other counting the even numbered sectors; (d) each release measurement shall be determined by taking the arithmetic average of the two sets of fibre counts conducted in accordance with paragraph (c); and (e) the concentration of asbestos fibres contained in gases released into the ambient air shall be the arithmetic average of the three measurements conducted in accordance with paragraphs (a) to (d). SOR/93-231, s. 2; SOR/94-364, s. 2