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r. <br /> F. f AZ DOUS W S <br /> ON O <br /> 0 D s: <br /> Periodic monitoring of the site is required to <br /> determine the effectiveness of engineering controls, <br /> of mine if <br /> to re-evaluate tions have changed. <br /> protection, minimuxnand ermonitor <br /> site condi <br /> at the beginning of each shift, periodically (e•9• 1 <br /> every 15 minutes) throughout the work, whenever work <br /> begins at a new area onsite or when different <br /> contaminants are en ntoring ilocationsward <br /> activity begins. Specific <br /> frequencies are given below. <br /> Carefully inspect each piece of monitoring equipment <br /> Failure of any of the <br /> prior to work startup. properly must be <br /> equipment listed below to work <br /> 4 reported to the Project Manager immediately. <br /> 1. Explosimeter/0 meter, <br /> activitieste ccording and <br /> to <br /> after each yl <br /> manufacturer's instructions. (NoteRecharge <br /> gPreparere <br /> end of each day. Monitor <br /> Specify frequency, location) and record measured <br /> levels in the loa book (Note to Preparer: <br /> Specify frequency) . <br /> Action levels: <br /> Ux losive Atmos a (measured at source, <br /> borehole, test pit, etc.) <br /> y <lo% LEL* Continue activity <br /> 10%-20% LEL Continue activity <br /> -e20% LEL Evacuate <br /> *LEL: Lower Explosive Limit <br /> 2. HNu (check contaminants and select the <br /> appropriate lamp) : Calibrate prig cording or to and after <br /> each day's activities, <br /> manufacturer's instructions. Record calibration <br /> in the SSC log book. Recalibrate after cleaning <br /> the lamp or when background levels drift. This <br /> ay <br /> instrument is sensitive to humidity <br /> t is humid. <br /> require periodic lamp cleaning zone <br /> Monitor every half hour in the breathing <br /> and record measured levels in 'the log books. <br /> ----- - -SF031605\WP\005.51 <br /> A-7 <br />