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<br /> SEE GUIDELINES . -',:.*3;'-','*‘; °`£ � } t t �'ti �W �g4�rr{
<br /> Problem/Opportunity: Please describe the problem, or.opportun , in a
<br /> rir
<br /> The City of Everett's water supply system provides potable water to over 500,000 residents and nearly all the
<br /> major commercial and industrial users throughout Snohomish county (over 80% of the population). The City
<br /> of Everett's water supply and transmission system is a critical element in ensuring the safe and adequate
<br /> delivery of water throughout Snohomish county. Transmission Line No 2 is a 48-inch diameter steel pipeline
<br /> that was constructed in 1929. In 1988 the City of Everett began a schedule to replace pipeline 2. The city has
<br /> replaced approximately 59,000 lineal feet of a total of 94,000 feet that make up pipeline 2. The City has
<br /> been working with MWH and HDR Engineering to perform studies and redesign evaluations for the
<br /> replacement of the transmission lines since 1988. MWH studies have evaluated the lines and also prioritized
<br /> the replacement schedule. MWH reported (Phase 1: Pre-Design City of Everett Water Transmission Pipeline
<br /> No. 2, October 1988): "Pipeline No. 2 has historically required extensive maintenance to maintain its
<br /> operation. The pipeline was installed in 1929 and is in need of replacement over most of its length. The 48-
<br /> inch diameter steel pipeline section from Panther Creek to the City of Everett, Pipeline No. 2 is currently
<br /> operated at a reduced service. The pipeline had a design capacity of 50 million gallons per day (MGD), but
<br /> due to age and reliability factors only 10 MGD can be carried through the westerly sections without excessive
<br /> leaks. Flows of 15 MGD have increased pressures in the pipeline sufficiently to cause failures in the welded
<br /> pipe seams". Work has also included pipeline inspection for internal and external corrosion to assist in the
<br /> pipeline replacement schedule. The inspection report ( Intermountain Corrosion Service, Transmission Line
<br /> No. 2 Inspection and evaluation, 1990) states that Transmission Line No. 2 has experienced substantial loss
<br /> of internal and external coating and sever pitting. In some cases the pipe wall thickness has been reduced by
<br /> more than 50%.
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<br /> The Phase 9 work will provide the design, construction of replacement of 4,400 lineal feet of the City's
<br /> existing water Transmission Line No. 2. The pipeline will be replaced with similarly sized pipe. The projects
<br /> objective is to restore the design capacity and integrity of the pipeline. Transmission Line No. 2 has been in
<br /> service for more than 80 years. It has well exceeded the original service estimates of 50 years.
<br /> The project will replace the existing pipe located in the Panther Creek basin which is a salmon rearing creek
<br /> and has several wetlands that create difficult access for maintenance. The new design will bring the pipeline
<br /> to new pipe conditions that will minimize impact to Panther Creek and adjacent wetlands, and will provide
<br /> access to the pipeline for future maintenance.
<br /> The scope of work for the project includes environmental and cultural resources studies, geotechnical
<br /> investigations, project design and permitting, construction, management, and wetland mitigation. The
<br /> pipeline will be constructed in existing City of Everet right-of-ways and easements.
<br /> Result Please describe the results or benefits anticipated with the proposed Solution. - 11
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<br /> - Improve System Performance: This project will improve system performance by maintaining an
<br /> uninterrupted water supply to more than 500,000 residents of Snohomish County, thus improving system
<br /> reliability. The replacement will allow the City to utilize the full capacity of the pipeline and will lower the
<br /> potential for pipeline breaks or interrupted service for public consumption. The design will upgrade the
<br /> sections to current seismic standards and features that provide for a more durable and long lasting pipe.
<br /> - Improve Environmental Health and Safety: This project occurs within the Panther Creek basin and in areas
<br /> designated as wetlands and critical habitat for endangered species. The project will mitigate construction
<br /> Fiscal Year 2013 Public Works Trust Fund Loan Application 36age 15
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