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attempted repair attempted to clamp autopsy backfilled backhoe block valves cathodic protection clamp the leak coating Colorado City company's written procedures cracked fillet weld earlier leak failure allowed toxic feet Fire extinguishers follow the company's full-wrap repair sleeve gas vapor detection gaseous Gulf Pipe Line hydrogen sulfide H2S independent contractor Irritation of eyes June 9 locations Longview Maintenance Manual manner which failed Member Isl National Transportation Safety oil to spray Operations and Maintenance oxygen breathing equipment pain in eyes percent permeate the leak Pipe Line Company pipe was excavated Pipeline Accident Report pipeline repairs Priority Followup probable cause psig pumped crude oil pumping sour crude rectifier repair crew repair or alteration ritation Safety Board determines safety equipment safety procedures safety ropes sense of smell sour crude oil spray and permeate stopple Supervisor temporary repairs Texas Gulf Pipe tools and equipment Transportation Safety Board upwind side West Texas Gulf workmen