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�..+ `..' <br /> Anheuser-Busch/Arch Road <br /> Site Safety Plan <br /> February 11, 1992 <br /> b. Explosive Vapors: Monitor for % of Lower Explosive Limit <br /> (LEL) with a 02/LEL meter to determine whether vapor <br /> concentrations within the confined space are within the <br /> flammable range. <br /> If LEL readings exceed 20%, personnel MQBT leave the site <br /> immediately, and contact the project manager. <br /> C. Toxic Vapors: Monitor for toxic vapors with a PID and/or <br /> an FID (e.g. , HNU or OVA) to determine whether toxic <br /> vapors within the confined space exceed the action levels. <br /> If the PID and/or the FID readings exceed 50 ppm, a half <br /> face respirator with organic vapor cartridges must be <br /> worn. <br /> If the PID and/or the FID readings exceed 100 ppm, a full <br /> face respirator with organic vapor cartridges must be <br /> worn. <br /> All monitoring equipment must be calibrated and maintained <br /> in accordance with manufacturer's recommendations. If an <br /> HNU is used, the 10.2 eV lamp is required for accurate <br /> readings. <br /> d. Summary: Do not enter the confined space unless: <br /> • the oxygen concentration is between 19.5 and 23%; <br /> • the LEL is less than 20%; <br /> • PID and/or FID readings are less than 750 ppm (a half <br /> face respirator must be worn above 50 ppm; a full face <br /> respirator must be worn if the readings exceed 100 ppm) <br /> e. Buddy System: The buddy system must be used when the work <br /> in the confined space: (1) requires the person's head to <br /> be below ground level; or (2) the person must work in a <br /> manhole or other space in which an exit may not be easily <br /> accessible. <br /> 11 <br />