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ERI Consulting, Inc. <br /> <br /> change differential pressure is reached. One standby unit of <br /> the same or higher rated capacity as the larger unit in use <br /> will be on site as a spare. For small enclosures and glove <br /> bags, a HEPA filtered vacuum system may be utilized to provide <br /> negative air pressure. The use of negative air units to <br /> provide circulation and scrub the air is suggested. A <br /> differential pressure of -0.02 inches of water must be <br /> maintained under all conditions. <br /> <br /> 2.2.1.2 Type "C" air supplied respirators in positive pressure or <br /> pressure demand mode with full facepieces and HEPA filtered <br /> disconnect protection are recommended by the U.S. EPA for all <br /> full shift abatement work until the successful completion of <br /> final clearance air monitoring. Powered air purifying <br /> respirators equipped with HEPA filters and full facepieces or <br /> respirators with a lower NIOSH assigned protection factor may <br /> be used for inspection or repair work of less than 1 hour <br /> duration per day. A sufficient supply of charged replacement <br /> batteries and filters and a flow test meter shall be available <br /> in the clean change area for use with powered air purifying <br /> respirators. Air purifying respirators with dual high- <br /> efficiency (~IEPA) filters may be utilized during work area <br /> preparation activities. (See Section 3.3.2.3). Spectacle kits <br /> and eyeglasses must be provided for employees who wear glasses <br /> and who must wear full facepiece respirators. Respirators <br /> shall be provided that have been tested and approved by the <br /> National Institute of Occupational Safety and Health and by <br /> the Mine Safety and Health Administration (MSEA) for use in <br /> asbestos contaminated atmospheres. <br /> <br /> 2.2.1.3 Compressed air systems shall be designed to provide air <br /> volumes and pressures to accommodate respirator manufacturer's <br /> specifications. The compressed air systems shall have a <br /> receiver of adequate capacity to allow escape of all <br /> respirator wearers from contaminated areas in the event of <br /> compressor failure. Compressors must meet the requirements of <br /> 29 CFR 1910.134 (d). Compressors must have an in-line carbon <br /> monoxide monitor and periodic testing of the carbon monoxide <br /> monitor must be evidenced. Documentation of adequacy of <br /> compressed air systems/respiratory protection system must be <br /> retained on site. This documentation will include a list of <br /> compatible components with the maximum number and tYlDe of <br /> respirators that may be used with the system. Periodic <br /> <br />4/11/03 53 <br /> <br /> <br />