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Both the respirator and cartridges specified i:or use in Levei C protection must be <br /> fit-tested prior to use in accordance with OSHA regulations (29 CFR 1910.1025, 29 <br /> CFR 1910.134). <br /> . Air purifying resoirators cannot be worn under th.e following conditions: <br /> • Oxygen deficiency r <br /> • IDLH concentrations <br /> 16.. • High relative humidity <br /> • If contaminant levels exceed designated use concentrations. <br /> Note: If respiratory protection is used the appropriate respirator usage log(s) <br /> must be completed and returned to the Office Health and Safety Officer (Appendix <br /> B). <br /> *4 3.4 Monitoring Requirements <br /> 3.4.1 Organic Vapors <br /> Monitoring for organic vapors in the breathing zone will be conducted with a <br /> photoionizatiuon detector. A Draeger bellows equipped with the appropriate tubes <br /> will be used to monitor for benzene. Readings will be taken under the following <br /> circumstances. <br /> • Upon initial entry onto the site. <br /> �..' • When weather conditions change. <br /> • When work begins on another portion of the site. <br /> �., • Every five feet during drilling. <br /> 3A.2 Combustible Gases <br /> Because of the grinding involved with drilling, there is a potential for sparks to be <br /> generated. Due to the possible presense of combustible compounds, it will be <br /> necessary to monitor for combustible gasses. A combustible gas meter will be used <br /> to monitor during ail drilling activities. Guidelines have been established by the <br /> National Institute for Occupational Safety and Health (NIOSH) concerning the <br /> action levels for wort: in a potentially_ explosive environment. These guidelines are <br /> as follows: <br /> 1) 10-20%n LEL - Limit all activities to those which do not generate sparks. <br /> 2) >20% LEL - Cease all activities in order to allow time for the combustible <br /> gases to vent. <br /> If the combustible gases in the well/bore hole are not diminished after allowing <br /> �.. adequate time to vent, then the following steps should be taken: <br /> • Obtain an air compressor (minimum 1.5 horsepower) <br /> • Place the compressor a safe distance from the well (at least 20 ft.). This <br /> precaution is necessary since the compressor itself is an ignition source. <br /> EIslssrMAIMM <br /> 3-3 <br />