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B. Employees need to remain in an alert, well-rested state in order to evaluate conditions at <br /> the site that are unfamiliar to them. <br /> 4.3 Underground Utilities (C) <br /> A. Underground utilities will be located prior to conducting subsurface work. <br /> B. Employees will take precautions so that drillers do not hit utilities. If utilities are <br /> encountered, 'live"wires will not be touched. Avoid contact with the drill rig in case it <br /> becomes energized, and notify appropriate utility agencies as soon as possible. <br /> 4.4 Injury from Chemical Contaminants in the Soil and Water(D) <br /> A. Petroleum products are the contaminants of concern at this site. Petroleum products <br /> contain total petroleum hydrocarbons as diesel (TPH-D), total petroleum hydrocarbons as <br /> gasoline (TPH-G), benzene, toluene, ethyl benzene, xylenes, and oxygenates such as <br /> methyl tert-butyl ether(MTBE). <br /> B. The hazards and safe working practices for chemicals expected to be found in the soil are <br /> summarized below: <br /> Hazardous <br /> Substance Hazard Safe Work Practice <br /> Diesel May cause mild dermatitis with <br /> Protect skin from exposure by always <br /> prolonged skin contact. Skin cancer wearing Nitrile gloves, protective <br /> has been reported in rats with coveralls, and chemical resistant boots <br /> repeated applications of diesel fuel. when sampling(Level D). If monitoring <br /> Inhalation of high concentrations may indicates high levels of petroleum <br /> cause mild narcotic effects. OSHA products, an air purifying respirator with <br /> exposure limit has not been nuisance dust and organic vapor <br /> determined. cartridges will be worn (Modified Level C). <br /> See Air Monitoring Procedures below in <br /> Section 4.5 regarding hydrocarbon levels <br /> Gasoline in air. <br /> Extremely volatile and flammable Protect skin from exposure by always <br /> concentrations can cause lung <br /> liquid. Inhalation of high wearing nitrile gloves, protective coveralls, <br /> and chemical resistant boots when <br /> damage. May cause skin or eye sampling (Level D). If monitoring indicates <br /> irritation. Components of gasoline high levels of petroleum products, an air- <br /> (benzene)can cause cancer or purifying respirator with nuisance dust and <br /> reproductive toxicity. organic vapor cartridges will be worn <br /> PEL : None established. See (Modified Level C). <br /> Benzene <br /> STEL 2: None established. See <br /> Benzene <br /> PEL is the Permissible Exposure Limit for a chemical exposure. It is a time weighted average(TWA)concentration of <br /> chemicals allowed over an 8-hour work shift(not to be exceeded). <br /> 2 STEL is a Short Term Exposure Limit for chemical concentrations(not to be exceeded)over a 15 minute time period. <br /> 03009-10017-37100 3 of 8 <br /> March 2014 <br />