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hold <br /> 4.1 Physical Injury/Accident Hazards (A) <br /> A. Employees must pay attention to rocks, ditches, loose, or wet soil, which may cause <br /> them to trip. <br /> B. Employees need to remain in an alert, well-rested state in order to evaluate conditions <br /> at the site, which are unfamiliar to them. <br /> 4.2 Drilling Rig Hazards (B) <br /> A. The cables from the drilling rig can break and fly out causing injury. The hydraulic lines to <br /> the auger can also break causing a release of hydraulic fluid that could get on employees <br /> nearby. Employees must wear hard hats and eye protection when working near the drill rig. <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 agencies as soon as possible (PG&E <br /> Emergency Number 800-743-5000) <br /> 4.4 Injury from Chemical Contaminants in the Soil and Water(D) <br /> Petroleum products, particularly diesel fuel and gasoline, lead, chromium, herbicides, and pesticides <br /> are the contaminants of concern at this site. Petroleum products contain benzene, toluene, ethyl <br /> benzene, and xylenes. Benzene is considered to be carcinogenic to humans. <br /> The hazards and safe working practices for chemicals expected to be found in the soil or water are <br /> summarized below: <br /> Hazardous Hazard Safe Work Practice <br /> Substance <br /> Diesel May cause mild dermatitis with Protect skin from exposure by always wearing <br /> prolonged skin contact. Skin cancer has Nitrile gloves, protective coveralls, and <br /> been reported in rats with repeated chemical resistant boots when sampling (Level <br /> applications of diesel fuel. Inhalation of D). If monitoring indicates high levels of <br /> high concentrations may cause mild petroleum products, an air purifying respirator <br /> narcotic effects. OSHA exposure limit with nuisance dust and organic vapor <br /> has not been determined. cartridges will be worn (Modified Level C). See <br /> Air Monitoring Procedures below in Section 4.5 <br /> regarding hydrocarbon levels in air. <br /> Gasoline Extremely volatile and flammable liquid. Same as above. <br /> Inhalation of high concentrations can <br /> cause lung damage. May cause skin or <br /> eye irritation. Components of gasoline <br /> (benzene)can cause cancer or <br /> reproductive toxicity. <br /> PEL': None established. See Benzene <br /> STEL 2: None established. See Benzene <br /> PEL is the Permissible Exposure Limit for a chemical exposure.It is a time weighted average(TWA)concentration of chemicals allowed over an 8-hour <br /> work shift(not to be exceeded). <br /> Z STEL is a Short Tenn Exposure Limit for chemical concentrations(not to be exceeded)over a 15 minute time period. <br /> 03009-10016 3 October 2013 <br />