Water Plant 4 timeline

   In response to numerous requests from the public, we have posted a presentation by the St. Cloud Utilities Department explaining the timeline of the city’s steps in addressing the issue of discolored water. The information has been posted in a format that meets American Disabilities Act (ADA) requirements for how governments must make information accessible to all.

Water Treatment Plant #4 Polisher Timeline
2008
• WTP No. 4 commissioned and operation begun.
2013
• First documented repairs to polishers.
2016
Spring - Additional welding repairs performed on Polishers.
– Initial customer complaints of discolored water and a flushing protocol initiated to remove the discolored water.

2017
May- Polisher repairs fail again, unable to perform additional repairs.
– City contacts Resin manufacturer with concerns about apparent changes to resin properties, gradation of particles, and fines in resin packaging believed to be contributing to the water discoloration.
June-Aug. – City contracts Engineering Consultant for analysis of resin and evaluation of the Polishers. City meets with resin manufacturer.
July – Bill Sturgeon appointed as City Manager, and directs staff to meet with IXOM, the resin manufacturer, and Jones Edmonds, to research the issue and make recommendations for a solution.
Fall - WTP #4 Polishers taken offline due to structural failure.
November - Resin system at WTP #4 is shut down to clean the MIEX system and prepare for a restart.
– Environmental Utilities Director resigns and Public Works Director assumes responsibility for Utilities under a consolidation with Public Works.

2018
January - City contracts with Engineering Consultant for design, permitting and construction of replacement polishers for WTP #4.
– Resin Treatment system is restarted at WTP #4 with two cells of a Polisher operational. Portion of water bypasses Polishers because of lack of capacity with only two cells.
February - City provides Resin manufacturer with results of consultant analysis of resin.
March - City posts door hangers and posts information regarding water discoloration. Resin manufacturer meets with City and consultant to discuss findings of resin analysis.
– 4 of 6 cells in the two Polishers are placed back into operation at WTP #4.
June - City contracts with Engineering Consultant for design, permitting and construction of hydrogen sulfide removal system for WTP #1.
September - City contracts with Tetra-Tech, an environmental engineering consultant, and US Water Corporation through Tetra-Tech to supplement City water operations staff and provide operations consulting.
– US Water begins work on restarting WTP#1, which has been offline
Sept./Oct. - City water operations supervisory staff dismissed and US Water assumes operations supervisory responsibility.
October - Notice to Proceed issued to contractor for the project for the removal of the failed Polishers and the installation of the new Polishers at WTP #4.

2019
Jan-March - US Water implements operational changes at water plants, significantly reducing the loss of MIEX resin from the treatment plants.
January - US Water restarts WTP #1.
May - US Water initiates a comprehensive system wide flushing program to attempt to remove accumulated MIEX resin particulates from the distribution system.
June - Public Services Director resigns and City contracts with former Executive Director of Toho Water Authority to serve as Interim Environmental Utilities Director beginning in July.
Contractor begins the installation of new Polisher units at WTP #4.
July - City hires a new Water Treatment Superintendent. Interim Utility Director starts about two weeks later.
August - City Water Treatment Superintendent begins assuming full responsibility for water treatment system. US Water assistance is begun to be phased out.
– City begins new Unidirectional Flushing program to flush accumulated MIEX resin from the distribution system. Unidirectional Flushing provides a more systematic, engineered process for flushing. City records data of flushing segments to monitor and gauge progress.
Aug.-Nov. - Contractor and City staff begin process of testing, adjusting, repairing, and replacing valves and controls for the new Polishers.
October - First cycle of Unidirectional Flushing is completed for areas with most impact/experiences of discolored water.
October 30th initial meeting with Utility Services about Ice Pigging.
November - Second cycle of Unidirectional Flushing is begun. Second cycle includes adding some additional water lines on side streets. With experience, the crew is making progress at much quicker rate on the second cycle and anticipates to be completed by the end of the year.
 December - Operational performance testing is performed on the new Polishers with the assistance of the equipment manufacturer’s representative. Some additional control and valve problems were discovered but significant portions/cells of the Polishers are ready for operation. Following a final report on the operational testing, both of the Polishers may be ready for full operation. City staff worked with Utility Services to develop a project scope and proposal for Ice Pigging the portion of the water system experiencing the most complaints. City Council approves funding of the Ice Pigging Project.

New Stainless Steel Polishers installed
03_polisher 1

04_polisher 2

05_polisher 3

2020
January - Completed second cycle of Unidirectional Flushing in first week.
– Added MIEX Resin to Water Plant #4 to bring resin level to recommended level for effective treatment and operation of the resin system.    – Met with Utility Services on the 15th to discuss proposed schedule and support for the Ice Pigging project.
 – Continue to work on making adjustments and trouble shooting new Polishers during operation. Polishers able to perform with manual oversight and adjustment.
- Change out MIEX resin at Water Plant #1. Resin required changing due to build up of sulfides and sulfur bacteria as a result of the levels of Hydrogen Sulfide in the raw water from well. Project to add Forced Draft Aeration to remove Hydrogen Sulfide to begin bidding at the end of the month.
• Scheduled and initiated a third Unidirectional Flushing program for Canoe Creek Lakes which includes having a sampling of residents across the development collect daily samples following the flushing to assist in evaluating the flushing program. Flushing and sampling performed from Jan 21st to Feb. 4th.
- A technical representative from IXOM, the MIEX company, was onsite Jan. 27th-29th to provide guidance and assistance in fine tuning the operation of the water plants and polishers. The representative will be providing a follow up report with recommendations.
• Met with Utility Services to finalize and coordinate the Ice Pigging effort to begin February 10th and run through March 23rd.
February - Ground Storage Tanks at WTP #4 cleaned by specialty contractor in advance of Ice Pigging work during first week of month.
– Consultation with Engineer on the operation and final steps for completion and certification of Polishers.
– Ice Pigging Begins February 10th for water lines on Old Canoe Creek Road. Ice Pigging to proceed for 33 days to March 23rd.

February finished water turbidity chart
06_Feb Turbidity table

Ice Pigging
• Ice pigging is an advanced pipe cleaning technology that is used on drinking water mains.
• More effective at removing sediment and debris than traditional water flushing.
• Uses less water, takes less time, and does not require pipe excavation.

How it Works
• Chiller Truck creates a slurry of ice overnight.
• Slurry of ice is pumped into a shutdown water main.
• The slurry of ice is pushed along the water main and picks up sediment and debris.
• The ice, sediment, and debris is removed from the system at a fire hydrant at the end of the run.
• The water main is out of service for about two hours.

Ice Pigging schedule

* UPDATED ICE PIGGING SCHEDULE  03/10/2020

3/9/2020

Canoe Creek Lakes

Zion Drive, Jebidiah Loop, Sasha Trail, Settlers Trail, Red Bird Avenue, Sky Flower Lane, Gold Rush Lane, Climbing Aster Court, Jebidiah Court

3/10/2020

Kissimmee Park Road

Kissimmee Park Road (Work performed at night)

3/11/2020

Kissimmee Park Road

Kissimmee Park Road (Work performed at night)

3/12/2020

Kissimmee Park Road

Kissimmee Park Road (Work performed at night)

3/13/2020

Kissimmee Park Road

Kissimmee Park Road, Fire Station #32 (Work performed at night)

3/16/2020

Sweetwater Creek

Summer Raye Court, Deata Court, Gina Anne Court, Sweetwater Boulevard, Sweetheart Court, Giselle Court

3/17/2020

Sweetwater Creek

Sweetwater Boulevard, Channing Drive, Gina Anne Court, Deata Court, Summer Ray Court, Sweetgum Street, Giselle Court

3/18/2020

Verandah Lakes

Lafayette Trace Drive, Marietta Way, Asheville Lane

3/19/2020

Magnolia Green

Flowering Peach Lane, Cedar Hammock Trail, Cedar Hammock Court

3/20/2020

Anthem Park

Centennial Avenue, Continental Street





Ice Pigging in St. Cloud

St. Cloud – 2/10/20

Ice Pigging truck
10_Pigging truck


St. Cloud – 2/10/20
Ice Pigging Results
11_water bottles

Water Treatment and MIEX Resin
Raw Water – Groundwater – Upper Floridan Aquifer

• 1st Step – Raw Water mixes with MIEX Resin in Contactors.
• 2nd Step – Settlers – Majority of Resin settles in tank for recirculation.
• 3rd Step – Settled water is filtered in Polishers to remove any resin particles that don’t settle in settling process.
• 4th Step – Chlorination for disinfection.
• 5th Step – Finished water to Ground Storage tanks

MIEX Resin
Purpose/Function of Resin.
• Removal of Dissolved Organic Carbon through Ion Exchange Process similar to a water softener.

MIEX Resin:
• Trimethylammonium chloride functional group.
• Iron oxide base to provide magnetic properties to resin.
• Chloride ion is exchanged for Dissolved Organic Carbon in Ion Exchange.
• Resin is regenerated with a concentrated Brine solution.

MIEX Resin Facts:
• Inert material certified for use in drinking water treatment by Environmental Protection Agency and the National Sanitation Foundation in the US and the Drinking Water Inspectorate in the United Kingdom.
• In use in over 70 water treatment plants around the world primarily in North America, Australia, and the United Kingdom.
• In use for water treatment for over 19 years.

Disinfection By-products
• Removal of Organic Carbon from Water prevents formation of regulated Disinfection By-Products
– Organic Carbon reacts with the Chlorine added for disinfection to form Disinfection By-Products
• Disinfection By-Products are regulated under the federal Safe Drinking Water Act because long term exposures can increase the risk for some types of cancer.
• Federal and state drinking water regulations mandate that a water supplier test for Disinfection By-Products quarterly and that the rolling annual average of the levels detected are below the regulatory level.
• Results of St. Cloud’s most recent testing conducted in November 2019 show that the levels of Disinfection By-Products are below the regulatory limit.

Q3 TTHM summary
01_Q3 TTHM

HAA5 Chart
02_HAA5