Laserfiche WebLink
C <br /> A summary of the response criteria is presented below. <br /> (OBZ - Operator's Breathing Zone) <br /> Analyzer Reading* Location Time Period Action <br /> < 15 ppm Borehole/ - ----- Continue periodic <br /> excavation monitoring. <br /> i <br /> > 15 ppm Borehole/ >1 minute Monitor OBZ; don <br /> excavation protective clothing <br /> as described in 7.0; <br /> establish work zones <br /> described in 8.1. <br /> < 15 ppm OBZ ---------- No respirators <br /> required. <br /> > 15 ppm OBZ >1 minute Half-face <br /> respirators with <br /> organic vapor <br /> c a r t r i d g e s ; <br /> establish decon area <br /> C' as described in 9.0. <br /> > 75PP m OBZ >1 minute Full-face <br /> respirators with <br /> organic vapor <br /> cartridges. <br /> i <br /> i <br /> C > 150 ppm OBZ >l min'ute Stop work; move <br /> upwind while vapors <br /> OR dissipate. If <br /> instantaneous elevated levels <br /> > 300 ppm OBZ remain, cover <br /> r, boring and cuttings, <br /> l evacuate upwind and <br /> L• notify DHSM or PM. <br /> * above background readings <br /> r CHEVMERC.H50 17 <br /> i <br />