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B. Fire and Explosion <br /> The presence of volatile liquids and vapors at this site presents the potential for fire or explosion <br /> during the excavation. The following precautions will be taken during the project to prevent fire <br /> or explosion: <br /> 1. There will be NO SMOKING within a 50 foot radius from the <br /> source of any vapors. <br /> 2. The atmosphere at the site will be continually monitored for the <br /> presence and concentration of flammable vapors and measurements <br /> will be documented in writing. <br /> 3. Two 10 A-20 B:C fire extinguishers will be maintained on site <br /> within 50 feet of the line of travel of the on-ground person <br /> designated as fire watch at all times. <br /> 4. During refueling of vehicles and heavy equipment, the engines of <br /> the equipment will be required to be off. There must be metal to <br /> metal contact between the refueling equipment and vehicle/heavy <br /> equipment being refueled. No combustion sources will be allowed <br /> with 25 feet of refueling operations. <br /> PERSONAL PRQTECTIVE EQUIPMENT <br /> Level D PPE will be required on site at all times. The following table will guide upgrades from <br /> this level of protection: <br /> Consistent-Sustained <br /> Breathing Zone <br /> RID Reading Level of Protgaign <br /> <10 ppm Level D <br /> 10 - 100 ppm Level D + half-mask air purifying <br /> respirator <br /> 50 - 500 ppm Level D +full-face air purifying <br /> respirator <br /> >500 ppm Level D + SCBA <br /> Descriptions of the different levels of protection are found in Appendix A. <br />