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Reported 11/24/2021 12:00 AM
Project Title

North Mercer Island and Enatai Interceptor Upgrade - Pump Station Improvements

Physical Address View project details and contacts
City, State (County) Mercer Island, WA 98040   (King County)
Category(s) Sewer and Water
Sub-Category(s) Lift and Pump Stations
Contracting Method Competitive Bids.
Project Status Bidding
Bids Due View project details and contacts
Estimated Value
Plans Available from County Agency
Owner View project details and contacts
Architect View project details and contacts

The upgrade at North Mercer Pump Station is to accommodate the increased flow and pumping head that it will experience with the planned pipeline improvements. The three existing raw sewage pumps will be replaced with four dry-pit submersible pumps, and the wet well will be modified to improve hydraulic performance. The discharge piping will be replaced with a new header that will allow flows to be pumped to either of two new force mains. Each force main will be equipped with a surge tank, located in the pump station dry well, to control hydraulic transients. Similarly, Lift Station 11 will be modified to accommodate the higher head associated with planned pipeline improvements, and will be converted from a wet well and dry well configuration to a wet well containing submersible pumps. The existing lift station force main, from the Fruitland Landing Park to the intersection of 97th Avenue SE and SE 34th Street, will also be rehabilitated by a cured-in-place pipe (CIPP) method, and the force main will be extended with a new 10-inch diameter pipeline along 97th Avenue SE, to connect to the new King County Interceptor system.


Lift and Pump Stations, Renovation.
Division 03 - Concrete.
Division 04 - Masonry.
Division 05 - Metals.
Division 06 - Wood, Plastics, and Composites.
Division 07 - Thermal and Moisture Protection.
Division 08 - Openings.
Division 09 - Finishes.
Division 10 - Specialties, Signage, Toilet, Bath, and Laundry Accessories, Fire Protection Specialties, Fire Extinguishers, Storage Specialties.
Division 11 - Equipment.
Division 12 - Furnishings.
Division 14 - Conveying Equipment, Scaffolding.
Division 21 - Fire Suppression.
Division 22 - Plumbing.
Division 23 - Heating, Ventilating, and Air Conditioning (HVAC).
Division 26 - Electrical.
Division 27 - Communications, Data Communications, Voice Communications, Audio-Video Systems.
Division 28 - Electronic Safety and Security.
Division 31 - Earthwork.
Division 32 - Exterior Improvements, Fences and Gates, Turf and Grasses.
Division 33 - Utilities, Common Work Results for Utilities, Water Utility Distribution Equipment, Water Utility Pumping Stations, Wastewater Utility Pumping Stations, Sanitary Utility Sewerage Force Mains.
Division 40 - Process Integration, Water Process Piping.
Division 45 - Industry-Specific Manufacturing Equipment.
Division 46 - Water and Wastewater Equipment.

Bidder's List View project details and contacts
Prospective Bidders View project details and contacts
Project Documents
 Engineered Spec Sheet
 Architectural Plans
 Other Documents