LABOR AND INDUSTRIES
Effective Date of Rule: January 2, 2008.
Purpose: On February 20, 2007, the department adopted changes to chapter 296-62 WAC, Part L - Atmospheres and Ventilation. Two sections were accidentally repealed in the rule making. This rule making corrected the error by putting the language back into the rule, which kept it as effective as the federal equivalent.
WAC 296-62-100 Oxygen deficient atmospheres and 296-62-110 Ventilation was added back into chapter 296-62 WAC as WAC 296-62-135 and 296-62-136.
These changes will not result in additional compliance costs.
WAC 296-62-135 Oxygen deficient atmospheres.
|•||Created this new section - wording is exactly the same as the wording that had been repealed from WAC 296-62-100 Oxygen deficient atmospheres.|
|•||Created these new sections - wording is exactly the same as the wording that had been repealed from WAC 296-62-110 Ventilation.|
Citation of Existing Rules Affected by this Order: New sections WAC 296-62-135 Oxygen deficient atmospheres, 296-62-13610 Ventilation guide, 296-62-13615 Adequate system, 296-62-13620 Exhaust, 296-62-13625 Make-up air quantity, 296-62-13630 Design and operation, and 296-62-13635 Compatibility of systems.
Statutory Authority for Adoption: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060.
Adopted under notice filed as WSR 07-17-155 on August 21, 2007.
Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 9, Amended 0, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.
Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, Amended 0, Repealed 0.
Number of Sections Adopted on the Agency's Own Initiative: New 9, Amended 0, Repealed 0.
Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 9, Amended 0, Repealed 0.
Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 0, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 9, Amended 0, Repealed 0.
Date Adopted: November 19, 2007.
WAC 296-62-135 Oxygen deficient atmospheres. (1) Definition. A lack of sufficient oxygen is deemed to exist if the atmosphere at sea level has less than 19.5% oxygen by volume or has a partial pressure of oxygen of 148 millimeters of mercury (mm Hg) or less. This may deviate when working at higher elevations and should be determined for an individual location. Factors such as acclimatization, physical conditions of the persons involved, etc., must be considered for such circumstances and conditions.
(2) Entering areas with possible oxygen deficient atmospheres. Workers entering any area where a lack of sufficient oxygen is probable shall be supplied with and shall use approved equipment (for specific requirements see applicable provisions of chapters 296-62, 296-307 (Part-U3), 296-809 and 296-841 WAC) capable of providing safe respirable air, or prior to entry and at all times when workers are in such areas a sufficient supply of safe, respirable air shall be provided. All workers so exposed shall be under constant observation. If the oxygen content is unknown or may change during occupation, tests shall be required prior to and during occupation of questionable areas.
(1) "Local exhaust ventilation" shall mean the mechanical removal of contaminated air from the point where the contaminant is being generated or liberated.
(2) "Dilution ventilation" means inducing and mixing uncontaminated air with contaminated air in such quantities that the resultant mixture in the breathing zone will not exceed the permissible exposure limit (PEL) specified for any contaminant.
(3) "Exhaust ventilation" means the general movement of air out of the area or permit-required confined space by mechanical or natural means.
(4) "Tempered make-up air" means air which has been conditioned by changing its heat content to obtain a specific desired temperature.