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® L_ GENERAL CONSTRUCTION/MAINTENANCE <br /> 1 . When drilling on LFG collection system piping containing LFG, only explosion- <br /> proof electric or hand-powered drills should be used. <br /> ® 2. When using alternating-current powered power tools, a portable ground-fault <br /> ® current interrupter (GFCI) should be used. <br /> ® 3. When welding near gas recovery process equipment, suitable procedures and <br /> ® precautions should be employed including: <br /> ® ♦ Processing a "hot work" permit. (A self-issued serial numbered permit is <br /> ® required in many states.) <br /> ® ♦ Designate a specific, dedicated individual, by name, as a fire watch. <br /> ® ♦ Verify that explosiveconcentrations are not present using an explosimeter. <br /> ® ® Have adequate fire extinguishers (20:A-80:BC) and fire blankets on hand. <br /> ® ♦ Sandbag all drains. <br /> ® ♦ Provide the appropriate purge and inert blanket on process equipment and <br /> ® piping. <br /> ® Procedures for safe welding and purging of process equipment are available <br /> ® from the American Petroleum Institute (API). <br /> ® M. SHORING AND BRACING <br /> 1 . No person shah enter any trench deeper than 4 to 5 feet unless the trench has <br /> ® been shored, braced, sloped, or other provisions made to prevent cave-in. <br /> ® Shoring shall be engineered by a qualified and licensed civil or structural <br /> ® engineer or engineering geologist. Drawings, specifications, and calculations <br /> ® shall be signed by the engineer. <br /> ® 2. Special consideration must be given to the less stable conditions represented <br /> ® by refuse vis-6-vis compacted soil. Refuse must be considered more prone to <br /> ® instability that may cause slope or side wall failure. This is due to the high void <br /> ratio, irregularity of material composing the refuse, and a typically lesser degree <br /> of compaction than soil. <br /> ® 1:21 <br />