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SECTION 7 <br /> ENVIRONMENTAL MONITORING PLAN <br /> The potential hazards identified in the hazard analysis portion of this plan determined the <br /> need for initial and/or on-going monitoring for assessment of exposure to the hazards as <br /> follows. <br /> The direct-reading instrument that will be used to monitor air quality in and around the work <br /> The PID measures the total or anic vapors present in the sampled <br /> PID OV g . <br /> areas is a 11'n• <br /> air. For health and safety purposes, total organic vapors detected will generally be used to <br /> confirm the selection of protective equipment. ;The PID'is calibrated using isobutylene as the <br /> standard. Calibration is validated daily prior 4o initiation of site work. <br /> Air monitoring for background levels of air contamination will be performed prior to and <br /> during drilling activities. Any time the PID readings indicate a sustained concentration <br /> greater than background plus 1 ppm measured in the breathing zone for one minute, air- <br /> ail personnel at that work location. <br /> purifying respirators will be worn by <br /> The following action levels are to be used at all times: <br /> Level D - Background levels to 1 ppm <br /> Level C - 1- 10 ppm above background <br /> Level B - 10-50 ppm above background levels <br /> Only the SSO has the authority to downgrade the level of protection. <br /> I <br /> f <br /> ISE <br /> f <br /> 5 <br /> fI l <br /> f <br /> E <br /> UNICEAMP <br /> 6.4.941 I t10 001-00 7-1 <br />