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1 0 0 <br />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 <br /><20 ppm <br />galatowim <br />HEW12tr M. <br />Level of Protection <br />Level D <br />Level D + half -mask air purifying <br />respirator <br />Level D + full -face air purifying <br />respirator <br />Level D + SCBA <br />Descriptions of the different levels of protection are found in <br />Appendix A. <br />4 <br />