Breaking Through Glass Ceilings

Breaking Through Glass Ceilings


Levi Hawkins, PEC, Glendale, AZ United States
Steve Mortensen, PEC

Abstract: The University and Warner simultaneous waterline projects provided unique challenges for construction and interesting opportunities to explore trenchless technology.

Rehabilitation/replacement was deemed necessary for over 4,500’ of the existing 14” water main in University Drive in Tempe, AZ. University is considered a crucial arterial in the city as ASU campus (52,000 students) is crossed by the roadway within the project. Slip-lining, horizontal directional drilling (HDD) as well as traditional open-cut installation was considered. However, it was clear that trenchless installation techniques reduce impact to the surrounding businesses, residents and traffic – factors which are inherent to open cut installation.

The Warner Road project involved new construction of roughly 5,600’ of 24” water transmission main. Warner Road does not have quite the magnitude of vehicle and pedestrian traffic of University Drive, yet the larger pipe size and length combined for an equally formidable task. Similarly, trenchless design was a viable option due to benefits including minimal traffic impact and project footprint. Despite those benefits, the existing utility layout across the 5,600’ span, among other factors, posed challenges for drilling. The task of determining depth and direction for utility crossings also made way for creativity, unique design and cooperative problem solving between contractor, engineer, and client. Ultimately HDD was chosen, and like University, the project was challenging yet successful.

The design and construction processes for these projects exposed clear benefits of trenchless technology. Reduction in traffic control, pavement cuts and a shorter overall construction schedule contributed to the evidence of trenchless superiority.

Publication Date: 2019

Presented at:
NASTT’s 2019 No-Dig Show Chicago, Illinois
March 17-21, 2019 | Paper Number: WM-T2-05

Non-Member Price: $10.00

Discounted Member Price: $0.00

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