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4.0 HAZARDS <br /> The known hazards associated with this site are: <br /> A. Trip or fall injury on rocks,gravel, or debris; <br /> B. Physical injury from sampling equipment and drill rig; <br /> C. Physical injury from underground utilities; <br /> D. Chemical injury from contaminants potentially existing in soil and water. <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 at <br /> 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 are <br /> the contaminants of concern at this site. Petroleum products contain benzene,toluene,ethyl benzene, <br /> 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 prolonged Protect skin from exposure by always <br /> skin contact. Skin cancer has been reported wearing Nitrile gloves,protective <br /> in rats with repeated applications of diesel coveralls,and chemical resistant boots <br /> fuel. Inhalation of high concentrations may when sampling(Level D). If monitoring <br /> cause mild narcotic effects.OSHA exposure indicates high levels of petroleum <br /> limit has not been determined. products,an air purifying respirator with <br /> nuisance dust and organic vapor cartridges <br /> will be worn(Modified Level Q. See Air <br /> Monitoring Procedures below in Section <br /> 4.5 regarding hydrocarbon levels in air. <br /> 03009-10017-37020 3 WRrzLER&KELLY <br /> August 2011 <br />