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41 Drilling <br /> Spectrurn mill be responsible for performing the drilling, and adhering to standard safety <br /> procedures The e\CIuSIQil zone for the drill rig work area will be a 20-loot radius <br /> around the rig Only authorized personnel will bL permitted xvitlun the exclusion zone <br /> No smoking will be permitted within the LxclLlsion zone <br /> 4 2 Nome <br /> Noise may be a hazard in the vicinity of the drill rig Hearing protection will be worn <br /> when working near heavy equipment or loud mechanical equipment <br /> 4.3 Heat Stress <br /> I <br /> IHeat stress will be a hazard during, hot weather and will be intensified when workers are <br /> in protective clothing Workers will be required to tale breaks as needed to prevent <br />' heat stress and to consume adequate quantities of liquid <br /> 5 0- AMBIENT AIR MONITORING/RESPIRATOR REQUIREMENTS <br /> ne a constituent of gasoline m III be used as a indicator parameter for ambient air monitoring <br /> Benzene � <br /> Because benzene is a suspected carcinogen and therefore tt4.;htly regulated it will be useful as a <br /> conservative indicator parameter The following discussion assumes that exposure to benzene is a <br /> possibility thus a safety measure for other potential air-bornL contaminants Is achieved <br />' a Breathing zone vapor at detectable concentrations at the drilling area as detected by an <br /> OVA requires site personnel to use a respirator with organic vapor cartridges and <br /> goggles while working in the CXCIUS10i1 zone As a reference, the OSHA-PEL for <br />' benzene Is l 0 ppm (see Table 5-1 belom) <br /> b Breathing zone vapor at aetectabie concentrations inquires site rnanager to monitor the <br /> site perimeter(concentrating in the domn wind direction) <br /> c Breathing zone vapor concentrations that reach or exceed 10 ppm at the drilling area, as <br /> detected by the OVA, requires site personnel to use a full face respirator with organic <br /> vapor cartridges while working in the exclusion zone <br />' d Breathing zone vapor Coll centratIoil s that reach or exceed 50 pl2m at the drilling area, as <br /> detected by the OVA requires site activities to be stopped until concentrations decrease <br /> Site manager should coiltinuocssl} monitor site rerinlefer <br /> L If breathing z0i1L vapor concentrations arc. detected at the site perimeter the sitL <br /> inanager shall monitor the pLrinlLter at 30 n11111AL Intervals <br />