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i <br /> { 6.0 EXPOSURE MONITORING PLAN <br /> Heat stress, noise, and chemical exposures may be encountered at this site. <br /> Heat stress monitoringand prevention p n is addressed in Section 5.1. Noise levels <br /> will not be monitored; D&M personnel will wear hearing protection as described <br /> in Section 5.3. <br /> 6.1 CHEMICAL EXPOSURE MONITORING <br /> C <br /> The field instrumentation described in this subsection has been <br /> rspecifically selected for the contaminants that may be reasonably anticipated to <br /> L be encountered during the course of this project. Selection factors include <br /> I <br /> anticipated airborne concentrations, potential interferences, ionization <br /> potentials, instrument sensitivity, and occupational exposure limits. The action <br /> levels described below are established with the expectation that <br /> p these specific <br /> instruments will be used. DO NOT SUBSTITUTE INSTRUMENTS WITHOUT THE CONSENT OF <br /> THE HSP PREPARER OR THE DHSM. <br /> A Photoionization Detector (PID) will be used to monitor for hydrocarbon <br /> vapors. The analyzer will be used on a regular ,,ibasis, typically every five to <br /> ten minutes, to monitor in the immediate vicinity of the borehole and cuttings <br /> adjacent to the borehole. If readings exceed an 'average of 15 ppm for more than <br /> i <br /> one minute, monitoring in the operator's breathing zone (OBZ) of the person <br /> working nearest the borehole will start immediately., and personnel will don <br /> protective clothing as described in Section 7.0. <br /> c <br /> An OBZ reading above 15 ppm for more than one minute will require the use <br /> Cof half-face respirators with organic vapor cartridges. An OBZ reading above 75 <br /> ppm for more than one minute will require the use of full-face respirators with <br /> organic vapor cartridges. If the PID reads more than 300 ppm instantaneously (>5 <br /> seconds) or 150 ppm for more than one minute, woirk will stop, and workers will <br /> move upwind while the vapors dissipate; if elevated levels remain for more than <br /> five minutes, the boring and cuttings will be coli eyed with clean soil, plastic <br /> sheeting, or foam, and the DHSM, HSP Preparer or PM will be contacted for further <br /> rguidance. <br /> 6.� <br /> i <br /> r CHEVMERC.H50 16 <br /> L <br /> 1 - <br />