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Physical hazards: <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 . 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 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 100 <br /> ppm total hydrocarbon is proposed as the maximum acceptable level of <br /> exposure without respiratory protection. In a typical situation with <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 />