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t + <br /> i <br /> POTENTIAL PROCEDURES FOR HAZARD <br /> HAZARDS i REDUCTION <br /> 7.Existing manholes sub- :k7.The oxygen in confined <br /> surface vaults and sheds ' spaces must be monitored <br /> are confined spaces that with an oxygen meter <br /> may lack adequate venti- prior to entry. If oxygen <br /> lation and trap organic 3 monitoring indicates that <br /> and/or combustible vapors. the level of oxygen is <br /> To avoid anoxia from the less than 19. 5%, <br /> lack of oxygen and/or personnel entering such <br /> overexposure to vapors, spaces must wear an air <br /> "pe-rsbnneeZ-!-entering these ' supplying respirator. <br /> spaces must follow the oxygen monitoring should <br /> procedure for reducing be conducted at the top, <br /> hazards. The confined middle, and bottom of the <br /> space must be monitored confined space. <br /> for (a) oxygen level, a <br /> (b) flammable vapors, The presence or absence <br /> and, (c) toxic vapors. of explosive vapors must <br /> be determined before <br /> entering any confined <br /> space. If the explosi- <br /> , `� meter readings are great- <br /> er than 20% of the Lower <br /> Explosive Limit (LEL) , <br /> confined spaces must not <br /> be entered and the Fire <br /> s Dept. should be notified. <br /> Note that the accuracy of <br /> explosimeters is comp <br /> - <br /> rimised when used in <br /> atmospheres that contain <br /> less than 19. 5% oxygen. <br /> IF . <br /> For monitoring toxic <br /> vapors, which are organic <br /> in nature (i.e. gasoline, <br /> ! diesel) , a PID or FID may <br /> be appropriate. Toxic <br /> vapors may also be <br /> detected by utilizing <br /> color-detector tubes <br /> (Draeger, Sensidine, <br /> etc. ) . <br /> -'12-. <br />