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L <br /> 6.3 <br /> ACTION LEVELS <br /> Action levels for upgrade and downgrade of respiratory protection/PPE <br /> Uyrd Action Taken <br /> Workers in support zone Level D PPE <br /> Workers within 10 feet of Level D PPE <br /> drill rig <br /> Breathing zone OVA readings Level C PPE <br /> > 50 ppm. <br /> Perimeter zone OVA readings Respiratory protection required <br /> >25 ppm <br /> Rationale for upgrade/downgrade matrix: <br /> The decision to upgrade to Level C protection at <br /> 50 ppm OVA readings is based on PEL for <br /> gasoline vapors. This action level is based on the assumption that total petroleum hydrocarbons <br /> potentially located below ground surface would approximate toxicity levels for gasoline. <br /> L <br /> L <br /> L <br /> L <br /> TETRA TECH: HEALTH AND SAFETY PLAN PAGE 12 <br />