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Physical hads: ' <br /> * operating machinery, <br /> * falling objects, and <br /> * exposure to outside temperature extremes . <br /> Fire, Electrical and Noise Hazards: <br /> * Underground gas and product lines , and <br /> * excessive machinery noise. <br /> Due to the nature of drilling, there is a risk for electrical shock <br /> from over head and underground electrical lines .i There is also a <br /> risk of physical injury from moving machinery and heavy drilling <br /> equipment. Explosive hazards exist when fuel concentrations in the <br /> bore hole reach explosive levels; > 10% LEL. <br /> Hydrocarbon Vapors <br /> Hydrocarbon vapors expected to be encountered ;cons'i.st of gasoline and <br /> diesel fuel . Exposure to elevated levels ;, of .hydrocarbon vapors <br /> presents potential health risks that need to ibe properly controlled. <br /> Work practices and methods will be instituted to limit exposures . <br /> where elevated exposures persist, respiratory Ifprotection will be the <br /> primary control method to protect personnel from inhalation of <br /> hydrocarbon vapors . The hydrocarbon va'pors.l expected to be <br /> encountered during project activities are composed of a variety of <br /> volatile refined petroleum compounds . The majority of these have <br /> limited toxicity requiring minimal controlslf; at .'the concentrations i <br /> expected. <br /> Petroleum fuel consists of hundreds of chemical. cohpounds . There are <br /> certain compounds such as Benzene that present significant hazards <br /> ` and must be properly controlled. To do so, a working limit of 100 <br /> ppm total hydrocarbon is proposed as the maximum acceptable level of <br /> exposure without respiratory protection. In a;ttypical situation with i <br /> 1% of the hydrocarbon vapors being benzene, a 100ppmv concentration . <br /> of total hydrocarbon will result in a breathing zone of less than <br /> a <br /> y� <br /> 1 ys <br /> ;1 <br /> :7 <br /> i4 <br />