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HAZARD ASSESSMENT <br /> Consistent efforts will be made throughout the project to <br /> evaluate the chemical and physical hazard;, described above. <br /> Fire, explosion, and VOC exposure hazards will be evaluated <br /> through an air monitoring program consisting of the following <br /> elements : <br /> Eire n qxp1_o_s_iQn <br /> A direct-reading portable GasTech combustible gas indicator <br /> (CGI) (calibrated to hexane) , which measures VOC <br /> concentrations in ppm or as a percentage of the lower <br /> explosive limit (LEL) , will be used to evaluate the possible <br /> formation of flammable atmospheres around the work area. <br /> Continuous measurements will be obtained froin the excavation <br /> face throughout the working day. Periodic measurements will <br /> a also be collected in any confined areas that may contain and <br /> accumulate combustible vapors. <br /> Exposure V <br /> Airborne concentrations of VOC's will be monitored throughout <br /> the excavation operations. VOC emissions from the excavation <br /> areas and stockpiled soil will be monitored continuously with <br /> a portable GasTech combustible gas indicator (CGI) <br /> (calibrated to hexane) , which measures VOC concentrations in <br /> ppm or,, as a percentage of the lower explosive limit (LEL) . <br /> HAZARD REDUCTION <br /> Gen r esasures_ and P„roCarlurpa <br /> Safety .Inspections <br /> walk-through safety inspections of the work area will be <br /> conducted daily before the start of work and as conditions <br /> change. The results of these surveys will be communicated to <br /> the work crews during regularly scheduled "tailgate safety" <br /> meetings. The safety procedures and the day' s planned <br /> operations will be discussed at these sessions. <br /> B-3 <br />