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10.0 PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS <br /> Chemical Name Molecular Vapor Ionization OSHA Cal-OSHA NIOSH ACGIH <br /> (CAS#) Weights Pressures Potential PEL s PEL REL TLV <br /> (mm-Hg) (eV) (ppmv) (ppmv) (ppmv)s (ppmv) <br /> Benzene* TWA 1ppm 0.0004- TWA 0.1ppm TWA 0.5ppm <br /> (71-43-2) 78.1 75 9.24 STEL 5ppm 0.0015ppm STEL 1ppm STEL 2.5ppm <br /> Toluene 92.1 21 8.82 TWA 200ppm 0.19ppm TWA 100ppm TWA 20ppm <br /> (108-88-3) C 300ppm STEL 150ppm <br /> Ethylbenzene 104.2 5 8.40 TWA 100ppm TWA 100ppm TWA 100ppm TWA 100ppm <br /> (100-41-4) C 200ppm STEL 125ppm STEL 125ppm <br /> o-Xylene TWA 100ppm TWA 100ppm <br /> (,95-47-6) 106.2 7 8.56 TWA 100ppm TWA 100ppm STEL 150ppm STEL 150ppm <br /> m-Xylene TWA 100ppm TWA 100ppm <br /> (108-38-3) 106.2 9 8.56 TWA 100ppm TWA 100ppm STEL 150ppm STEL 150ppm <br /> p-Xylene 106.2 9 8.44 TWA 100ppm TWA 100ppm TWA 100ppm TWA 100ppm <br /> (106-42-3) STEL 150ppm STEL 150ppm <br /> Gasoline500ppm TWA 300ppm TWA 300ppm <br /> (8006-61-9) 110 38 300 (15-minutes) STEL 500ppm STEL 500ppm <br /> Diesel TWA 15ppm <br /> --- --- --- --- -- --- <br /> (Not Applicable) (vapor) <br /> Waste OilTWA 5 <br /> (Not Applicable) <br /> -- --- --- --- -- mg/m3 <br /> (fumes) <br /> Lead* ___ TWA 0.05 TWA 50 TWA 0.05 TWA 0.05 <br /> (7439-92-1) 207'2 0 mg/m3 Ng/m3 mg/m3 mg/m3 <br /> 1)Source: National Institute for Occupational Safety and Health (NIOSH), 2004."NIOSH Pocket Guide to Chemical Hazards", February 2004. <br /> PEL= permissible exposure limit REL = recommended exposure limit TLV = threshold limit value <br /> C= ceiling concentration TWA= time-weighted average STEL= short-term exposure limit <br /> ^NIOSH recommendation is to"minimize workplace exposure concentrations"(see Appendix A of the NIOSH Pocket Guide to Chemical <br /> Hazards). <br /> * Asterisk indicates that the chemical is known to the State of California to cause cancer per the <br /> Proposition 65 list of chemicals and the Safe Drinking Water and Toxic Enforcement Act of 1986 <br /> (revised December 2, 2005) <br /> Atmospheric vapor concentrations will be monitored via a photo-ionization detector (PID) with lamp energy <br /> appropriate for the contaminants of interest or equivalent to determine appropriate action levels. The PID will be <br /> calibrated daily by AEI personnel prior to use. Calibration will be performed in accordance with the manufacturer <br /> AEI Health&Safety,Injury&Illness Prevention Plan Page 8 of 25 <br /> June 24, 2011 <br />