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5.0 AIR MONITORING PLAN <br /> 5.1 ACTION LEVELS FOR IMPLEMENTATION OF AIR MONITORING <br /> Level Action taken <br /> Excavation of soil Monitoring durin when <br /> g sampling P g <br /> (through.drilling) contaminated soil is excavated <br /> 5.2 AIR MONITORING EQUIPMENT <br /> I � <br /> OVA utilized to monitor total petroleum hydrocarbons, calibrated with methane. <br /> TETRA TECH: HEALTH AND SAFETY PLAN PAGE 10 <br /> jI <br /> I � <br />