An annual survey of high-pressure gas transmission mains by a local utility near Cincinnati pinpointed anomalies on the premises of the natural gas plant. Its maintenance policy allowed only vacuum excavation to avoid damaging the vast number of underground pipes while exposing them for visual inspection.The plant’s pipeline integrity contractor had trailer-mounted hydroexcavation units, but using them would take too long to remove the anticipated volume of material. Seeking a full-size machine, he hired Tele-Vac Environmental of Mason, Ohio.“We’ve worked together before,” says hydroexcavation manager Alex DuDeVoire. “Our responsibilities were to dig two standard 5- by 10- by 8- or
