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50 psig 8-inch gas main accumulation of gas apartment house blast hole blaster blasting operations blasting regulations Borough of Coopersburg caused by dynamiting closely positioned dynamite construction project consulting engineer Corporation to act cracked acetylene weld depth drilled earlier warning excavation excessive weight explosion and fire facilities failed section February 2l fracture gas which leaked heavy and closely inches initial inspector about excessive jobsite Main Street Municipal Authority National League National Transportation Safety natural gas Office of Pipeline oxyacetylene weld Pennsylvania Public Utility Pennsylvania State Police PIPELINE ACCIDENT REPORT pipeline failure Pipeline Safety positioned dynamite charges Preconstruction Meeting preplanned emergency procedure pressure previous gas leak proximity Public Utility Commission Recommendation red shale Safety Board determines SAFETY BOARD Washington sanitary sewer service crack service lines sewer contractor sewer project shock wave shutdown specific preplanned emergency struction surface tion Transportation Safety Board UGI inspector UGl's valves vicinity of utility weld failures