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.,..� ✓ <br /> Excavation and Trenching: <br /> Excavating and trenching in contaminated soil will potentially expose field personnel <br /> to the chemical hazards described below. Rupturing of electrical and gas utility lines <br /> ' are also potential fire hazards as described below. <br /> ' Chemical Hazards: <br /> Exposure to various chemical substances, including but not limited to, petroleum <br /> ' hydrocarbon liquids and vapors from gasoline and diesel fuel, waste petroleum oil and <br /> grease. <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 or operating excavation equipment, there is a risk for <br /> electrical shock from over head and underground electrical lines. There Is also a risk <br /> ' of physical injury from moving machinery and heavy equipment. Explosive hazards <br /> exist when fuel concentrations in the bore hole reach explosive levels; >10% LEL. <br /> Hydrocarbon Vapors: <br /> Hydrocarbon vapors expected to be encountered consist of gasoline and diesel fuel. <br /> Exposure to elevated levels of hydrocarbon vapors presents potential health risks that <br /> need to be properly controlled. Work practices and methods will be instituted to limit <br /> exposures. Where elevated exposures persist, respiratory protection will be the <br /> primary control method to protect personnel from inhalation of hydrocarbon vapors. <br /> The hydrocarbon vapors expected to be encountered during project activities are <br /> composed of a variety of volatile refined petroleum compounds. The majority of these <br /> have limited toxicity requiring minimal controls at the concentrations expected. <br /> A:\HEAL&SAF\TANK.001 29 January 1993 <br /> ' 4 <br />