Reservoir Pump Station Equipment Assessment & Design
Project Status
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Project Details/Neighborhood
Water Reservoir
Background
The City’s water system contains two booster pump stations. The main booster pump station is located at the reservoir and consists of 5 submersible pump and motor assemblies (“assemblies”). This station distributes water from the reservoir tanks out to residents.
Description
The City selected RH2 Engineering as the design consultant. RH2 started evaluating the reservoir booster pump station equipment in July 2021 to determine if the current motor and pump assemblies are adequate for operations before moving forward with a design for replacement.
Construction Project Timeline (Target Completion Date)
Complete design Q4 2023
Estimated Budget
$200,000
Contact
Chris Marks, City of Mercer Island Utilities Engineer: (206)-677-1027 or chris.marks@mercerisland.gov
Status Updates
May 2, 2024
Design of the project is complete. Construction updates can be followed from the project’s construction web page found here: http://www.mercerisland.gov/WU0128
February 2024
Photo: The primary scope of work involves replacing the five vertical turbine style pumps shown.
This project will improve efficiency and reduce energy costs at the City’s booster pump station by replacing the five vertical turbine pumps and adding two small pumps to handle flows during low demand. Contractor bids on the project will be accepted until February 29th. Work is tentatively scheduled to begin in spring of 2024 and be completed in spring of 2025.
October 2023 Update
The City’s design consultant, RH2 Engineering, is in the final stages of project design. Over the next two months, RH2 will incorporate the City’s 90 percent submittal comments as well as run the proposed design changes through the City’s recently updated water system hydraulic model. The updated model, provided by HDR Engineering, reflects current water demands, and captures any operational changes and piping revisions that have occurred due to current infrastructure projects (see Booster Chlorination System Project - www.mercerisland.gov/water21-28). The 100 percent design package is anticipated to be complete by the close of 2023.
April 2022 Update
The City has elected to replace the five submersible pumps with five vertical turbines and also add two small pumps to the system to handle flows during low demand to improve efficiency and reduce energy costs. The engineering consultant, RH2 Engineering, is working to finalize the report and then will submit it to the Washington State Department of Health (DOH) for approval. Design for this project will start later this month.
February 2022 Update
RH2 Engineering presented their preliminary pump station analysis and provided three alternative pump station configurations. The City has elected to move forward with replacing the five submersible pumps with five vertical turbine pumps. A smaller pump may also be included to handle low-demand flows, but further investigation is needed. RH2 is working to prepare the draft design report, expected in the next month.
November 2021 Update
Photo 1: Pressure transducer gauge on the hydrant side port
Photo 2: Setting hose monsters up
Photo 3: Active hydrant testing at the site
Photo 4: Consultant checking pressure on residual guage
In September, RH2 performed hydrant flow tests at four sites to evaluate the existing hydraulic conditions in the city’s pumped zone, the largest zone on the island. These results will then be compared with the current hydraulic model for this zone and updated if necessary. On the day of testing, pressure transducer gauges were installed on side ports at eight locations throughout the pumped zone to monitor the system pressures during the tests. For each hydrant test, two hose monsters and one residual gauge were attached.
RH2 has since analyzed the data from this testing and will soon select pump alternatives.
September 2021 Update
Photo- consultant gathering pump measurements
RH2 has been reviewing historical data from the reservoir to assist in determining possible replacements for the current submersible pumps. In August they visited the reservoir and collected measurements to record the available space in the pump room. This information will then be used when pumps are being identified.
Project Location (2 MB)