The project consisted of a new, approximately 138- mile, high-voltage electric transmission line in Southern Wyoming. The foundation scope consisted of reinforced concrete drilled piers for 518 four-legged lattice towers, 21 steel poles and 26 direct embedded two-pole structures. In total, 2,145 foundations were installed, ranging from three to nine feet in diameter and requiring more than 13,500 cubic yards of concrete. Foundation construction was completed by ADSC Contractor Member, Longfellow Drilling, a division of PAR Electrical Contractors, as part of a larger Quanta Services team, which included QEPC, Summit Line Construction and Quanta Subsurface.
With experience on electric transmission projects across North America, the project team was familiar with the challenges typically associated with long, linear projects. What made this project especially challenging was that the schedule was governed by biological variance restrictions and unpredictable weather, which significantly limited any pre-construction geotechnical investigations and delayed construction start dates. Once on-site, challenges extended to material scarcity, which threatened an already off-track construction schedule. The team worked together to come up with flexible designs and proactive sourcing to ensure a successful outcome.