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