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ruS ayl:dl pdZdrpS: <br />* operating i :hinery, <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. 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; > 108 LEL. <br />Hydrocarbon Vapors <br />Hydrocarbon vapors expected to be encountered consist of gasoline and <br />diesel fuel. Exposure to elevated levels of hydrocarbon vapors <br />presents potential health risks that need to be properly controlled. <br />Work practices and methods will be instituted to limit exposures. <br />where elevated exposures persist, respiratory protection will be the <br />primary control method to protect personnel from inhalation of <br />hydrocarbon vapors. The hydrocarbon vapors 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 controls at the concentrations <br />expected. <br />Petroleum fuel consists of hundreds of chemical compounds. 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 loo <br />ppm total hydrocarbon is proposed as the maximum acceptable level of <br />exposure without respiratory protection. In a typical situation with <br />18 of the hydrocarbon vapors being benzene, a 100ppmv concentration <br />of total hydrocarbon will result in a breathing zone of less than <br />9' <br />