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296-36-140  <<  296-36-145 >>   296-36-150

PDFWAC 296-36-145

Regulation of pressure and air quality in working areas—Air quality in working areas.

(1) Ventilation. An automatic air quality monitoring system acceptable to the director, department of labor and industries, shall be installed in the pressurized working chamber and shall at all times be maintained in proper working condition. The system shall provide continuous sampling and monitoring of the air and shall indicate by visual and audible alarm the presence of dangerous air contaminants in excess of the following:
Carbon monoxide
100 ppm
Carbon dioxide
5000 ppm
Oxides of nitrogen
5 ppm
2500 ppm
Hydrogen sulphide
20 ppm
The director in his discretion may change these concentrations to conform with good practices as recommended by the American Conference of Governmental Industrial Hygienists.
The system shall also indicate and give alarm at any time the oxygen content is less than 19.5 percent.
The system shall be so arranged that the visual and audible alarm will give warning in the working chamber and at the lock tender's station at the low pressure side of the locks.
In addition to the specific requirements contained in these standards of safety chapter 296-62 WAC shall apply for rock dust and ventilation.
(2) Protection against atmospheric containments: The requirements of chapters 296-62 and 296-155 WAC, Part Q shall apply.
[Statutory Authority: Chapter 49.17 RCW. WSR 90-17-051 (Order 90-10), § 296-36-145, filed 8/13/90, effective 9/24/90; Rules (Part VII C), filed 12/28/62; § 25, filed 3/23/60.]
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