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5: Air Monitoring Plan Health and Safety Plan <br />Activity Action Level Level of Respiratory Protection <br />Soil and Groundwater Sampling < 5 ppm above background Level D: No respiratory protection required. <br />Soil and Groundwater Sampling > 5 ppm Cease operations and evacuate work area. <br />Contact RSUM and PM immediately. <br />BROWN AnDCALDWELL <br />5-2