Filters

Filters

Project Manager

Water Utilities Engineering / Candy Staring, P.E.

SUA Project No. 16WG08

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What We're Doing

The City of Stillwater and the Stillwater Utilities Authority will be upgrading and improving the filtration system at the Water Treatment Plant (WTP).


Anticipated Milestones

  • Anticipated Date (Design): FY2020
  • Anticipated Date (Construction): FY2022
  • Anticipated Date (Completion): FY2024

Benefits of the Project

The current filters were constructed with the original WTP in the early 1980s. The new filters planned for the WTP will provide deeper beds for superior filtration, improved backwashing and better cleaning of the filter media for an overall higher quality of treated water.


Budget & Funding

  • Year Funded: FY2017
  • Funding Source: Water Fund
  • Project Budget: $1 Million
  • Expenditures to date: $433,309

Project Management


Updates

February 7, 2017: Black and Veatch has been hired to provide conceptual design services.

September 6, 2017: Evaluation of the filters added to Black and Veatch's scope in order to optimize filtration and improve overall functionality.

March 12, 2018: After evaluation most of the process and chemical feed systems at the WTP, a priority has been assigned to each individual component. The Project Team will prepare a Facilities Plan to develop a conceptual and phasing plan for the work to include the filters.

September 4, 2018: Black and Veatch will complete a year of water quality testing before design work will proceed for the new filters. The results of the testing will also help the design team decide how best to modify the treatment scheme at the WTP in order to provide the highest water quality possible in the distribution system.

January 10, 2019: Pilot testing equipment has been installed in the Finished Water Pump Station. Samples will be gathered throughout 2019, to determine biological stability and ozone dosage requirements under various operating schemes. 

June 17, 2019: Pilot tests continue and have been expanded to include a lead and copper testing component. The filter rate pilot unit was delivered in May, began operating on June 1st and will continue through the end of September 2019. The remaining tests are anticipated to continue through the first part of 2020.

October 28, 2019: Testing and data analysis continues. Black and Veatch is working to consolidate requests and present recommendations.

December 20, 2019: The Filter Rate Pilot Study Technical Memo is complete. This information will be used to design the new filters. Additional results for remaining pilot study efforts are being finalized by the City's consultant.

January 22, 2020: Alternative Project Delivery (APD) methods are being considered for the overall WTP needed improvements which have a combined design and construction cost estimate of up to $60 Million.

April 23, 2020: With the recent completion of pilot tests, summary reports are being reviewed by City staff. New insights to optional treatment strategies and project sequencing are being evaluated for a holistic approach to needed upgrades at the WTP.

July 14, 2020: Staff is evaluating the costs of various phasing scenarios associated with existing WTP rehabilitation versus construction of new WTP in the future.


Actions Authorized by Stillwater Utilities Authority (SUA)

  • 1.9.17  I  SUA-17-01  I  Professional Services Agreement

  • 7.17.17  I  SUA-17-22  I  Amendment to Professional Services Agreement

  • 9.10.18  I  SUA-18-34  I  Request for Additional Expenditures and to Execute Contract Amendments to the Professional Services Agreement


Images

Cut-away of Stillwater WTP Existing Filter.

Diagram of the Water Treatment Plant's existing filters
Source: http://www.westech-inc.com/en-usa/products/conventional-gravity-filter-centrol

Existing filters looking to the west

exposed filters and filtering material at the water plant

filter media testing at the water treatment plant

pilot testing equipment at the water treatment plant