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