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2-inch plastic pipe 20594 PIPELINE ACCIDENT 7-inch bare steel 7-inch gas main 7-inch steel gas active corrosion adequate leak survey adjacent sewer manholes August 16 beverage cooler cathodic protection check adjacent sewer combustible gas indicator corrosion control standards Country Dress Country Dress Shop Delta Natural Gas ductile iron electric motor existing corrosion hole Federal regulations five-block radius gas check gas company personnel gas company's standards gas indicators CGI gas pressure Gas Service Company January 16 Kentucky large corrosion hole leak detection survey leakage survey MANHOLE AND STREET meter National Transportation Safety Natural Gas Company ounces of pressure ounces to 17 PIPELINE ACCIDENT REPORT pressure was increased Priority Action radius were shattered relighting procedures required by 49 segment of pipeline service line sewer manhole survey sewerline smaller corrosion holes source of ignition steel gas main subpart Town and Country Transportation Safety Board uprating project written plan written procedure