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4.3 Heat Stress <br /> ' Heat stress will be a hazard during hot weather and will be intensified when workers <br /> are in protective clothing. Workers will be required to take breaks, as needed, to <br /> ' prevent heat stress and to consume adequate quantities of liquid. <br /> ' 5.0 - AMBIENT AIR MONITORING/RESPIRATOR REQUIREMENTS <br /> ' a. Breathing zone vapor at detectable concentrations at the excavation area, as detected <br /> by an OVA, requires site personnel to use a respirator with organic vapor cartridges <br /> ' and goggles while working in the exclusion zone. The OSHA-PEL for benzene is 1.0 <br /> ppm (see Table 5-1 below). <br /> ' b. Breathing zone vapor at detectable concentrations requires site manager to monitor the <br /> site perimeter (concentrating in the down wind direction). <br /> C. Breathing zone vapor concentrations that reach or exceed 10 ppm at the excavation <br /> ' area, as detected by the OVA, requires site personnel to use a full face respirator with <br /> organic vapor cartridges while working in the exclusion zone. <br /> N d. Breathing zone vapor concentrations that reach or exceed 50 ppm at the excavation <br /> area, as detected by the OVA, requires site activities to be stopped until concentrations <br /> decrease. Site manager should continuously monitor site perimeter. <br /> ' e. If breathing zone vapor concentrations are detected at the site perimeter, the site <br /> manager shall monitor the perimeter at 30 minute intervals. <br /> ' f. If the vapor concentrations continue to reach or exceed a value of 10 ppm at the site <br /> perimeter for 15 minutes, excavation activities shall be stopped. Appropriate <br /> ' regulatory agencies should be contacted (see contact sheet). Site manager shall <br /> continue to monitor conditions until levels are reduced to background conditions. <br /> 1 <br />