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4.2 Noise ' Noise may be a hazard in the vicinity of the drill rig. Hearing protection will be worn when working near heavy equipment or loud mechanical equipment. ' 4.3 Heat Stress Heat stress will be a hazard during hot weather and will be intensified when workers are in protective clothing. Workers will be required to take breaks, as needed, to prevent heat stress and to consume adequate quantities of liquid. 5.0 - AMBIENT AIR MONITORING/RESPIRATOR REQUIREMENTS a. Breathing zone vapor at detectable concentrations at the drilling area as detected by an ' OVA, requires site personnel to use a respirator with organic vapor cartridges and goggles while working in the exclusion zone. The OSHA-PEL for benzene is 1.0 ppm (see Table 5-1 below). ' b. Breathing zone vapor at detectable concentrations requires site manager to monitor the site perimeter (concentrating in the down wind direction). ' C. Breathing zone vapor concentrations that reach or exceed 10 nam at the drilling area, as detected by the OVA, requires site personnel to use a full face respirator with organic vapor cartridges while working in the exclusion zone. ' d. Breathing zone vapor concentrations that reach or exceed 50 opm at the drilling area, as detected by the OVA, requires site activities to be stopped until concentrations ' decrease. Site manager should continuously monitor site perimeter. e. If breathing zone vapor concentrations are detected at the site perimeter, the site manager shall monitor the perimeter at 30 minute intervals. f. If the vapor concentrations continue to reach or exceed a value of 10 ppm at the site perimeter for 15 minutes, drilling activities shall be stopped. Appropriate regulatory agencies should be contacted (see contact sheet). Site manager shall continue to monitor conditions until levels are reduced to background conditions. t