Gravity Sewer - TPC Golf Course to the North Pumpback Station

Project Owner: City of Scottsdale
Project Type: Construction Manager at Risk
Construction Dates: 03/24 to 06/26

This project included the self-performed installation of more than 6200 LF of 36” and 48” gravity sewer and 23 large diameter (6’ to 7’) precast polymer concrete manholes to support future development in North Scottsdale. The depth of the pipeline and manholes ranges from 13’ to 38’. We used trench boxes, manhole boxes, and slide rail shoring to maintain safe working conditions.

The location of this work is across the Tournament Players Club (TPC) Champions Golf Course and along Pima Road next to the Loop 101. We coordinated with the TPC golf course and area stakeholders to maintain access and minimize disruptions.

We delivered this work in multiple Guaranteed Maximum Price phases:

GMP 1: This phase included long lead procurement of materials to keep the project on schedule.

GMP 2: This portion of the project included the installation of more than 4,320 LF of 36” gravity sewer and 13 large diameter (6’) precast polymer concrete manholes. The location of this work is across the northern portion of the TPC Champions Course.

GMP 3: This portion of the project included the installation of 1,200 LF of 48” gravity sewer and seven large diameter (6’ to 7’) precast polymer concrete manholes. We managed a jack and bore of 186 LF of 36” pipe within a 54” steel casing 35’ to 38’ deep under the CAP dike embankment. This work is along Pima Road next to the Loop 101. This GMP also involved a bypass pumping operation to divert existing sewer flows into the newly constructed system. Upon installation of the large-diameter sewer manholes, four 20’ diameter manhole protection rings were installed, providing long-term protection for the newly installed structures.

GMP 4: This phase included work at the North Pumpback Station. The pumpback station is a critical part of the City of Scottsdale’s water distribution system, designed to pump reclaimed water to golf courses in northern Scottsdale for irrigation, reducing reliance on groundwater. This project provided upgrades to the existing pumpback station so it could accommodate increased upstream flow capacity from the Optima and TPC improvements. The scope of work focused on upsizing intake flow capacity and modernizing the pump station, including widening inlet channels, installing a junction structure and slide gates, modifying the wet well, and upgrading both mechanical and electrical control systems. Major work items included a junction structure, three manholes, more than 500 LF of 48” HOBAS pipe, wet well modifications, bypass pumping, jack-and-bore operations (263 LF of 66” jack and bore between three manholes and the junction structure), and associated mechanical and electrical upgrades.