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30 psig 5-inch-long hole backfill blowing gas Class 3 location clean the pipe clothing company's construction consulting engineer digging test holes dirt dispatcher distribution main dry chemical electronic pipe locator emergency plan emergency valve engineering department erroneous 3 l/2-foot escaping gas establish the exact excavation damage extinguish the fire fire department fire extinguisher foreman gas company employees gas company inspector gas fires gas pipeline ruptures Gas Service Company hand tools heavy excavating equipment highloader inches installed iron stake June l2 Kansas City l0-inch pipeline line spotter locate the pipeline location flags Missouri Missouri law National Transportation Safety operating pressure OSHA percent permanent pipeline markers pipefitter pipeline crossing pipeline pressure polyester pressure transmission pipelines Priority Action project coordinator protection rasp repair crew right-of-way rubber-tired backhoe sewer easement stopple supervisor suspected underground obstructions Transportation Safety Board trench U.S. Department Underground Facility unsupervised equipment operator vertical locations weld reinforcement sleeves workers