9th Avenue Waterline Replacement

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9th Avenue Waterline Replacement

Hillsboro, OR

Details

440 LF

8” DIP Installed

4 New Water Services

Project

As part of the 9th Avenue Waterline Replacement project, Century West provided preliminary and final engineering for the abandonment of an existing 6-inch steel waterline, construction of 440 linear feet of new 8-inch ductile iron pipe (DIP), and four new water services. Project challenges included:

Large concrete-encased communications duct bank crossing waterline
High pressure gas lines with Northwest Natural cathodic protection grounding station and grounding well within project limits
Scheduling restrictions due to adjacent elementary school

Century West also completed final engineering, plan preparation, and project specifications for three additional projects that were combined with this project. These projects, with preliminary engineering provided by the City, involved the construction of a total of 830 linear feet of 8-inch DIP and 760 linear feet of 6-inch DIP along with 23 new water services. The City used GIS data to perform the preliminary layouts and turned the designs over to Century West to perform field survey to identify potential utility and surface feature conflicts with the preliminary alignments prior to final engineering.