SR-900 Water Supply Pipeline | Cascade Water Alliance

Location: Issaquah, WA

Size: 1.1 miles
Final Cost: $8 Million

Completion Date: 2009

Scope: Construction Management,

Owner's Representative

EngineerMayes Testing Engineers

As both the Project Manager and Owner’s Representative on the SR-900 Steel Water Pipeline project, Hainline managed the scope and installation of the 1.1 mile-long steel water supply pipeline. This work consisted of installation of a 1.1 mile, 42-inch steel polyurethane lined water supply pipeline. The project also involved close coordination with WDOT’s SR-900 road widening project, west of Issaquah to the Talus neighborhood.

In the center of an urban city, the scope involved two open trench creek crossings and a multitude of utilities (i.e. Qwest, Comcast, AT&T, City sewer and storm drainage) for coordination. The firm worked with Mayes Testing Engineers to provide all field and special inspections and material testing. As project manager, Hainline managed the Cascade portion of the project during construction administration with daily coordination with the Prime General Contractor, WSDOT, and the stakeholder group. Complex coordination scope included night crossings and traffic revisions to accomodate construction with minimal disruption to the Talus neighborhood and private residences. 

The work incorporated stream diversion and fish windows, urban utilities, public outreach, traffic control, and included noise variances and night work. Utility stakeholders included Abovenet, AT&T, Comcast, Level 3 Communications, 360 Networks, Puget Sound Energy (electric and gas), Qwest, and the City of Issaquah along with WSDOT and CWA. In addition, issued permits included ACOE, Department of Fish and Wildlife, and the City of Issaquah. The project was completed on time and under budget.