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(b) Airborne TWA established by the Occupational Safety and Health Administration <br /> (OSHA) and published in the NIOSH Pocket Guide to Chemical Hazards, 1990 <br /> edition. <br /> Physical Hazards <br /> On-site nonchemical hazards are safety hazards associated with heavy equipment including the <br /> drill rig, heat stress, noise, possible traffic, and possible electrical hazards. All field personnel <br /> must be aware of drilling activities and general traffic at all times. <br /> Drilling <br /> During drilling acitivities, physical hazards will include heavy equipment use, and possible noise <br /> hazards. All personnel should be aware of moving heavy equipment at all times. Personnel <br /> should avoid crossing in the path of heavy equipment and be sure the oeprator is aware of <br /> personnel before they approach the equipment. The work zone is to be clearly marked using <br /> cones or caution tape. BC standard operating procedures for boerehole drilling, including hand <br /> augering the first five of the borehole, are to be followed at all times. <br /> Traffic <br /> Since a majority of BC's drilling projects are conducted in parking lots and public right-of-ways, <br /> automobile traffic is of concern. While working in areas where traffic is moderate or heavy, <br /> BC personnel shall: wear an orange safety vest (shirts or jackets acceptable) at all times; have <br /> the work zone clearly delineated using traffic cones, barricades, caution tape, and/or men <br /> working signs; and have on-site and available, a written traffic safety plan approved by the <br /> corporate health and safety officer. Additional traffic control measures may be set forth in an <br /> encroachment permit. If an encroachment permit is required, the permit shall be on-site and <br /> accessible at all times <br /> Noise <br /> Noise is a potential hazard in areas where heavy equipment including dell ngs, power tools, <br /> pumps or generators are operated. Heavy equipment operation may produce noise levels that <br /> reach or exceed 85 decibels (dBA), the action level established by the Occupational Safety and <br /> Health Administration (OSHA). Elevated noise levels will be evaluated by the SSO when the <br /> dnll ng is operated. Exposure to elevated noise levels can lead to temporary or permanent <br /> hearing loss, and can also cause muscle tension and irritability. The SSO will ensure heanng <br /> protection is utilized when noise levels are elevated, e.g., when the drill ng is in operation. The <br /> rule of thumb to follow for evaluating noise levels is when a conversation can not be held within <br /> 3 feet hearing distance. <br /> wee <br />