This project examines the raw water supply system and assesses the condition
of, and possibly recommends improvements to, critical raw water supply
infrastructure assets including the gate house, tunnel, screen house,
industrial and water treatment plant pipelines, and chlorination facilities.
In 2011, the Filter-Clogging Algae Mitigation Evaluation was completed. The final report noted that even completely protected and secured water sources require some level of pretreatment. A pretreatment system was recommended as a basic element of the water treatment plant. Specifically, a dissolved air flotation (DAF) pretreatment system was recommended as the best and most sustainable solution to manage treatment of raw water from Lake Whatcom.
The project consists of three phases. Phase 1 includes site analysis and condition assessment of current infrastructure and is slated for completion by October 1, 2014. Phase 2 develops the design and specifications for the various selected project elements. Phase 2 may begin in the spring of 2015 followed by Phase 3, construction to begin in early 2016.
he DAF pretreatment system will complement the existing long-term strategy for watershed protection. While the use of DAF pretreatment is on the leading edge of treatment technology and well-known and well-used technology in Europe and the United States, this project will be one of first applications in Washington State.
The pretreatment DAF project is on schedule and budget. The final report is due to the City by the second week of October 2014. Currently project staff are investigating an alternative water source coming from Bloedel Donovan Park referred to as the Larson Mill Connection. This will allow removal of the screen house for repairs in the next phase of the project. Staff are also looking at modifications to the chlorine facilities and adding a powered activated carbon (PAC) to the treatment process for taste and odor concerns coming from Lake Whatcom.
For the next phase, staff are currently developing an application to pursue a $12 million Drinking Water State Revolving Fund (DWSRF) loan. Application are due to the state by September 30, 2014.
Accomplishments: Survey complete, design underway
Next Milestone: Complete 60% design
Freeman Anthony, P.E.
Phone: (360) 778-7700
Email Public Works