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2-inch steel line 2-inch valve 20 psig 2l feet south 6-inch cast-iron main 6-inch main abandoned line accident area accumulation of natural Annandale apartment complex apartment superintendent backfill bar test holes beneath the concrete broken cast-iron reducer C&M crew Cast-iron Fittings Cathodic protection concrete road surface corrosion leaks crawl space destroyed apartment distribution main ductile East San Antonio entered the apartment excavation February l3 Federal regulations fracture surface Gas indications Gas Light gas odors hazard holes were drilled ignition leak 6 days leaked primarily lesser extent March 24 National Transportation Safety Natural Gas Explosion Office of Pipeline permeated the area Piedras Street PIPELINE ACCIDENT REPORT pipeline operators Pipeline Safety probable cause Recommendation replaced reported leak Safety Board determines SAFETY BOARD Washington segment of pipeline service line Southern Union Gas telephone numbers tenants thread break thread failure traffic Transportation Safety Board uncovering and disturbing undetermined source Union Gas Company unsuccessful search