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Indallatim of XW-1 Health mid Sardy 11Im.AUCH M.1995 0809IM-9.130C 4.2 Drilling Drilling contractors will be responsible for performing the drilling and adhering to standard safety procedures. The exclusion zone for the drill rig work area will be a 30- foot radius around the rig. Only authorized personnel will be permitted within the r exclusion zone. No smoking will be permitted in the exclusion zone. 4.4 Noise Noise may be a hazard in the vicinity of excavators and drill rigs. Hearing protection will be worn when working near heavy equipment or loud mechanical equipment. 4.5 [feat 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 excavation area or drilling area, as detected by an OVA(FID detector), requires site personnel to use a respirator with organic vapor cartridges and goggles while working in the exclusion zone. The OSHA- PEL for chloroform is 2 .0 pprn(see Table 5-1 below). b. Breathing zone vapor at detectable concentrations at the excavation area or drilling area, requires site manager to monitor site perimeter(concentrating in the down wind direction). C. Breathing zone vapor concentrations that reach or exceed 10 ppm at the excavation area or drilling area, as detected by the OVA, requires site personnel to use a fill face respirator with organic vapor cartridges while working in the exclusion zone. d. Breathing zone vapor concentrations that reach or exceed 50 ppm at the excavation area or drilling area, as detected by the OVA, requires site activities to be stopped until concentrations decrease. Site manager should continuously monitor site perimeter. A-8 r