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SITE AIR MONITORING PROGRAM <br /> Action Levels <br /> Th.Action Levsls,I not defirwd by regulation,ere.oma pereara(usuasy 50%)of the epp6cable PEUREUMV. TM ru nber must also be adjusted to <br /> acecum for irratn ffl response fasten. <br /> Tasks Action Laves Action <br /> Ambient Air Confined Space <br /> ❑ Explosive atmosphere Concentration Concentration <br /> N/A <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 /> >25% LEL >10% LEL Work must stop. Ventilate area <br /> before returning. <br /> ❑ CoConfined Space <br /> Oxygen Concentration Concentration <br /> N/A <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. Investigate <br /> changes from 21%. <br /> >25% 02 >23.5% 02 Work must stop. Ventilate area <br /> before returning. <br /> ❑ <br /> Radiation N/A < 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)g signifies possible <br /> sources) radiation present. <br /> Continue investigation with <br /> caution. Perform thorough <br /> monitoring. Consult with a <br /> > 1 mrem/hour Health Physicist. <br /> Potential radiation hazard. <br /> Evacuate site. Continue <br /> investigation only upon the <br /> advice of Health Physicist. <br /> ® Organic gases and vapors Tasks 1-6 <br /> Organic vapor monitoring with a PID-OVM will be used to monitor breathing zone,headspace, and downhole during all intrusive <br /> activities. <br /> If the OVM registers a sustained 1 RRU in the breathing zone,a Draeger tube for benzene will be used to evaluate the <br /> presence of benzene. <br /> If benzene or vinyl chloride is present at < 1 ppm and the OVM 1-5 RRU, upgrade to Level C. <br /> If benzene or vinyl chloride >1 ppm or if OVM exceeds >5 RRU, upgrade to Level B. <br /> ® Inorganic gases, vapors and particulates Tasks 1-6 <br /> No particulate sampling will be conducted if conditions become dusty or windblown dust. <br /> Implement dust suppression activities to control dust, or upgrade to Level C. <br /> Corporate Health and Safety Page 17 of 36 <br />