Horizontal Boring & Tunneling, of Phoenix, AZ, recently completed a 54″ diameter bore 440’ in length through hard, caliche rock. The project required a 24″ sewage line be installed under I-17 in Anthem, AZ. Horizontal Boring used a Michael Byrne Mfg. D72-1.5M auger boring machine and a 54” retractable, roller cone cutting head to complete…
