Laserfiche WebLink
. * 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 overhead and underground electrical lines. There is also a <br /> risk of physical injury from moving machinery and heavy drilling <br /> equipment. Explosive hazards may exist if fuel vapor <br /> concentrations in the UST reach explosive levels (greater than 10% <br /> LEL) . <br /> 4. DISCUSSION OF POTENTIAL CHEMICAL HAZARDS <br /> The Material Safety Data Sheets (MSDS) for compounds that are <br /> potentially present on site are included in Appendix A. <br /> 4. 1 Hydrocarbon vapors <br /> Hydrocarbon vapors expected to be encountered consist of Stoddard <br /> Solvents. Exposure to elevated levels of hydrocarbon vapors <br /> presents potential health risks that need to be properly <br /> controlled. Work practices and methods will be instituted to limit <br /> exposures. Where elevated exposures persists, respiratory <br /> protection will be the primary control method to protect personnel <br /> from inhalation of hydrocarbon vapors. The hydrocarbon vapors <br /> expected to be encountered during project activities are composed <br /> of a variety of volatile refined petroleum compounds. The majority <br /> of these have limited toxicity requiring minimal controls at the <br /> concentrations expected. <br /> Petroleum fuel and solvents consist of hundreds of chemical <br /> compounds. There are certain compounds such as Benzene that <br /> present significant hazards and must be properly controlled. To do <br /> so, a working limit of 100 ppm total hydrocarbon is proposed as the <br /> maximum acceptable level of exposure without respiratory <br /> protection. In a typical situation with 1% of the hydrocarbon <br /> vapors being benzene, a 100 ppmv concentration of total hydrocarbon <br /> will result in a breathing zone of less than 1 ppmv benzene. This <br /> level is one tenth of the current occupational Permissible Exposure <br /> Limit (PEL) for an 8 hour exposure to benzene. <br /> 4.2 Action Levels of Hydrocarbon Components in Petroleum Fuel <br /> Hydrocarbons >100ppm PEL LEL >10% <br /> 4 <br />