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carcinogen, causing leukemia in humans The Occupational Safety and Health <br /> Administration's benzene permissible exposure limit is 1 part per million (ppm) <br /> ' Exposure to aromatic compounds could occur primarily through inhalation of <br /> vapors during drilling and sampling To a lesser extent, absorption of these <br /> compounds through unprotected skin could also become an exposure pathway <br /> ' <br /> Exposure Monitoring Plan <br /> g a <br /> ' Upon encountering suspect hydrocarbon compounds other than motor oil or <br /> diesel, air quality surveys will be performed so that airborne concentrations of <br /> ' contaminants remain below prescribed action levels The minimum frequency for <br /> air quality surveys will be once every 30 minutes The On-site Safety Coordinator <br /> will perform air monitoring with a portable photo-ionization detector Results of the <br /> ' survey will be used to assess the level of respiratory protection required If total <br /> organic vapor levels exceed 1 ppm in the general breathing zone, the On-Site <br /> Safety Coordinator will require the use of air-purifying respirators If organic vapor <br /> ' levels exceed 5 ppm, all personnel will immediately stop operations and move to a <br /> suitable upwind location After relocation to a safe area is complete, the On-site <br /> Safety Coordinator will initiate downwind perimeter monitoring and, if necessary, <br /> twarn unprotected personnel <br /> Equipment used to monitor the site under investigation for airbome levels of <br /> vapors and gases will be calibrated daily before use A photo-ionization detector <br /> will be calibrated with a 100 ppm isobutylene standard This instrument will be <br /> zeroed in a contaminant-free atmosphere immediately before use Airborne <br /> ' measurements of organic gases and vapors recorded during field activities will be <br /> documented in a field notebook by the On-site Safety Coordinator <br /> Personal Protective Equipment <br /> ' The following protective equipment may be required during drilling, excavating and <br /> sampling activities <br /> ' 0 hard hat <br /> • air-purifying respirators with organic vapor and acid gas cartridges <br /> ' (readily available, if necessary) <br /> • safety glasses or goggles <br /> ' 0 bnght safety vests <br /> ' 0 hearing protection <br /> A-2 <br /> i <br />