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Condor Earth Technologies,Inc. <br /> Health and Safety Plan <br /> 5.0 - AMBIENT AIR MONITORING/RESPIRATOIR, REQUIREMENTS <br /> a. Breathing zone vapor at detectable concentra ions at the excavation area or drilling area, as <br /> detected by an OVA, requires site personnel to use a respirator with organic vapor cartridges <br /> and goggles while working in the exclusion2one. The OSHA-PEL for benzene is 1.0 ppm <br /> (see Table 5-1 below). <br /> ~ b. Breathing zone vapor at detectable concentra ions at the excavation area or drilling area, <br /> requires site manager to monitor site perimeter (concentrating in the down wind direction). <br /> C. Breathing zone vapor concentrations that reach or exceed 10 j2prn at the excavation area or <br /> r drilling area, as detected by the OVA, requi s site personnel to use a full face respirator with <br /> organic vapor cartridges while working in the exclusion zone. . <br /> d. Breathing zone vapor concentrations that reach or exceed 50 opm at the excavation area or <br /> 4 . <br /> drillina area, as detected by the OVA, requi s site activities to be stopped until concentrations <br /> decrease. Site manager should continuously monitor site perimeter. <br /> I^ <br /> TABLE 5-I <br /> Potential Gasoline Contaminants and Exposure Limits <br /> Compound OSHA-PEL TLV-TWA TLV-STET. REL ppm Odor threshold Odor Characteristic <br /> Ppm Ppm ppm values,ppm <br /> �— Benzene 1 10 5 0.1 4.55 aromatic, <br /> .l <br /> (Ca) sweet <br /> r . Toluene 100 100 150 100# 1.74 sweet, <br /> pungent <br /> Xylene 100 100 150 100# 0.27 aromatic, <br /> sweet <br /> t <br /> PEL - OSHA Personnel Exposure Limit. <br /> TLV - ACGIH Threshold Limit Values. <br /> TWA - Time Weighted Average. <br /> STEL - Short Term Exposure Limit. <br /> REL - NIOSH Recommended Exposure Limit. <br /> Ca - Suspected carcinogen, 1988-89 ACGIH TLV. <br /> ND - Constituent not detected in soil sample, however, enzene is a common gasoline <br /> constituent and likely to be present at the site. <br /> # - 50 minute ceiling, 10 hour TWA, 200 ppm 10 minute ceiling. <br /> 1 <br /> Page -4 of 5- <br />