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CCondor Earth Technologies,Inc. Health and Safety Plan 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, 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 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 afull face respirator with organic vapor cartridges while working in the exclusion zone. fd. Breathing zone va or 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. TABLE 5-1 Potential Gasoline Contaminants and Exposure Limits 4 Compound OSHA- TLV-_ - TLV-STEL REL Odor threshold Odor PEL ppm TWA ppm ppm ppm values, pprn Characteristic Benzene(Ca) l 10 5 0.1 4.65 aromatic, sweet Toluene 100 100 150 1004 1.74 meet, pungent i 'Xylene 100 100 150 100# 0.27 aromatic,sweet ;I .PEL -OSHA Personnel Exposure Limit. TLV -ACGIH Threshold Limit Values. 'TWA -Time Weighted Average. i STEL -Short Term Exposure Limit. REL -NIOSH Recommended Exposure Limit. Ca -Suspected carcinogen, 1988-89 ACGIH TLV. ND -Constituent not detected in soil sample,however,benzene is a common gasoline constituent and likely to be present at the site. 4 -60 minute ceiling, 10 hour TWA, 200 ppm 10 minute,ceiling. i I Page -4 of 5-