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Physical hazards: <br />* operating manery, <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 <br />to be encountered consist of gasoline and <br />diesel fuel. Exposure to <br />elevated levels of hydrocarbon <br />vapors <br />presents potential health -isles that need to be <br />%cork practices and methods <br />properly controlled. <br />will be instituted to l5m__ <br />expOsureS.where elevated exposures pe=sis , yes` 1_atory pro ec:.1On W=11 be thA <br />Primary control method to <br />prosect personnel from inhalation o= <br />hydrocarbon vapors. The <br />hydrocarbon vapors expected be <br />encountered during project <br />volatile <br />to <br />ac`ivities are composed of a variety of <br />refined petroleum <br />limited <br />compounds. The majority of these have <br />toxicity requiring <br />expected. <br />minimal controls at the concentratior.•s <br />Petroleum fuel consists of hundreds of chemical compounds. There are <br />Certain compounds such as Benzene that present significant <br />and must properly cont -rolled. r hazards <br />be proper y cont�o__e�. To do so, a working limit of 100 <br />ppm total hydrocarbon is proposed as the maximum acceptable level o= <br />exposure Without respiratOry protection. -n a typical S-;tuat_ with <br />1% Of the hydrocarbon vapors being benzene, a 100ppmv concentration_ <br />C= total hydrocarbon will result in a breathing zone of less than�- <br />