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SITE AIR MONITORING PROGRAM-FORM 13 <br /> Action Levels <br /> These Action Levels,if not defined by regulation,are some percent(usually 50%)of the applicable PEL/TLV/REL. That number must <br /> also be adjusted to account for instrument response factors. <br /> Tasks Action Level :Action <br /> ❑Explosive atmosphere Ambient Air Confined Space <br /> Concentration Concentration <br /> <10%LEL 0 to 1%LEL Work may continue.Consider <br /> toxicity potential. <br /> 10 to 25%LEL 1 to 10%LEL Work may continue. Increase <br /> monitoring frequency. <br /> Work must stop. Ventilate area <br /> >25%LEL >10%LEL before returning. <br /> ❑Oxygen Ambient Air Confined Space <br /> Concentration Concentration <br /> <19.5%02 <19.5%02 Leave area. Re-enter only with <br /> self-contained breathing <br /> apparatus. <br /> 19.5%to 25%02 19.5%to 23.5%02 Work may continue. <br /> Investigate changes from 21%. <br /> >25%02 >23.5%02 Work must stop. Ventilate area <br /> before returning. <br /> ❑ Radiation <3 times background Continue work. <br /> 3 times background to<1 mR/hour Radiation above background <br /> levels(normally 0.01-0.02 <br /> mR/hr)signifies possible <br /> radiation source(s)present. <br /> Continue investigation with <br /> caution. Perform thorough <br /> monitoring. Consult with a <br /> Health Physicist. <br /> >1 mrem/hour Potential radiation hazard. <br /> Evacuate site. Continue <br /> investigation only upon the <br /> advice of Health Physicist. <br /> ®Organic gases and 1-2 PID readings in breathing zone(BZ):5 1 ppm unit Continue working in Level D. <br /> vapors above background. <br /> PID readings in BZ consistently>50 ppm unit Cease work. <br /> above background that do not dissipate. <br /> Although PID readings greater than 50 ppm are not <br /> anticipated,the breathing zone action guidance <br /> document will be implemented if PID detects over <br /> 50 ppm. <br /> ®Inorganic gases,vapors,and 1-2 Negligible visible dust. Continue working in Level D. <br /> particulates <br /> Visible dust that does not dissipate. Cease work and engineering <br /> controls implemented <br /> 15 of 23 <br />