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Hazardous Hazard Safe Work Practice <br /> Substance <br /> Benzene Prolonged and repeated exposures Same as above. <br /> cause anemia, lymphoma, and other <br /> cancers in lab animals. Causes skin <br /> and eye irritation. OSHA exposure <br /> limits: <br /> PEL: 1 ppm <br /> STEL: 5 ppm <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 liquid. Same as above. <br /> Inhalation of high concentrations can <br /> 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 work <br /> outlined in the Workplan is considered to be low due to the low concentrations found in earlier sampling. <br /> However, the air in the employees' breathing zone will be monitored periodically for the presence of <br /> hydrocarbons with a PID5. If the PID measures hydrocarbon levels above 100 ppm, employees will <br /> immediately don their half face respirators with organic vapor cartridges (modified Level C). <br /> Respirators will continue to be worn until the PID indicates total petroleum below 50 ppm. <br /> If dusty conditions develop in the contaminated area, the ground will be misted with water to prevent <br /> inhalation, skin contact, or ingestion of dust which may be contaminated with lead, chromium, <br /> herbicides, or pesticides. <br /> '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 /> a STEL is a Short Tenn Exposure Limit for chemical concentrations(not to be exceeded)over a 15 minute time period. <br /> s PID is a Photo Ionization Detector used to detect non-specific hydrocarbon vapor levels. <br /> 03009-10016 4 October 2013 <br />