Laserfiche WebLink
r <br /> c <br /> 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 <br /> shock from over head and underground electrical lines. There is <br /> also a risk of physical injury from moving machinery and heavy <br /> drilling equipment . Explosive hazards exist when fuel <br /> concentrations in the bore hole reach explosive levels; > 10% <br /> LEL. <br /> Hydrocarbon Vapors <br /> Hydrocarbon vapors expected to be encountered consist of <br /> gasoline and diesel fuel . Exposure to elevated levels of <br /> hydrocarbon vapors presents potential health risks that need <br /> to be properly controlled . work practices and methods will be <br /> instituted to limit exposures . Where elevated exposures <br /> persist, respiratory protection will be the primary control <br /> method to protect personnel from inhalation of hydrocarbon <br /> vapors . The hydrocarbon vapors expected to be encountered <br /> during project activities are composed of a variety of volatile <br /> refined petroleum compounds . The majority of these have limited <br /> toxicity requiring minimal, controls at the concentrations <br /> expected. <br /> Petroleum fuel consists of hundreds of chemical compounds . <br /> There are certain compounds such as Benzene that present <br /> significant hazards and must be properly controlled. To <br /> do so, a working limit of 100 ppm total hydrocarbon is <br /> proposed as the maximum acceptable level of exposure without <br /> respiratory protection . In a typical situation with 1% of the <br /> hydrocarbon vapors being benzene , a 100ppmv concentration of <br /> total hydrocarbon will result in a breathing zone of less than <br />