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Hazardous Hazard Safe «'ork Practice <br /> Substance <br /> STEL':None established. See Benzene <br /> Benzene Prolonged and repeated exposures cause Same as above. <br /> anemia, lymphoma, and other cancers in <br /> lab animals. Causes skin and eye <br /> irritation. OSHA exposure limits: <br /> PEL: 1 ppm <br /> STEL: 5ppm <br /> Toluene Eye and respiratory irritant. Same as above. <br /> PEL: 100 ppm <br /> STEL: 150 ppm <br /> Ethyl Severely irritating to eyes at high Same as above. <br /> benzene concentrations. May cause dizziness. <br /> Highly irritating to mucous membranes <br /> of the nose. <br /> PEL: 100 ppm <br /> STEL: 125 ppm <br /> Xylenes Toxic:Vapors in high concentration are Same as above. <br /> anesthetic. Irritant to skin and upper <br /> respiratory system. <br /> PEL: 100 ppm <br /> STEL: 150 ppm <br /> MTBE Extremely volatile and flammable Same as above. <br /> liquid. Inhalation of high concentrations <br /> can cause lung damage or respiratory <br /> failure,dizziness,headache, loss of <br /> balance,unconsciousness,coma,and <br /> death. May cause severe skin or eye <br /> irritation. MTBE can cause cancer and <br /> may cause reproductive/mutagenic <br /> toxicity. <br /> PEL 3: None established. <br /> STEL 4: None established. <br /> 4.5 AIR MONITORING PROGRAM <br /> The likelihood of encountering hazardous levels of hydrocarbons during the performance of the <br /> work outlined in the Workplan is considered to be low due to the low concentrations found in <br /> earlier sampling. However,the air in the em3loyees' breathing zone will be monitored periodically <br /> for the presence of hydrocarbons with a PID . If the PID measures hydrocarbon levels above 100 <br /> ppm, employees will immediately don their half face respirators with organic vapor cartridges <br /> (modified Level Q. <br /> 'STEL is a Short Term Exposure Limit for chemical concentrations(not to be exceeded)over a 15 minute time period <br /> 3 PEL is the Permissible Exposure Limit for a chemical exposure.It is a time weighted average(TWA)concentration in parts per million(ppm)of chemicals <br /> allowed over an 8-hour work shift(not to be exceeded). <br /> 4 STEL is a Short Term Exposure Limit for chemical concentrations(not to be exceeded)over a 15 minute time period. <br /> 5 PID is a Photo Ionization Detector used to detect non-specific hydrocarbon vapor levels. <br /> 03009-10016-37020 4 WINZLER&KELLY <br /> August 2011 <br />