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Zebra Mussel Mitigation Update Stephanie Sue, P.E., Water Treatment Operations Manager Water & Wastewater Commission | June 8, 2022 Last Update: September 9, 2020 W&WW Commission 09.09.2020 - ZM Briefing Update Agenda  Zebra Mussel Activity and Public Outreach  Ongoing Treatment of Zebra Mussels (Copper Sulfate)  Water Treatment Plant Intake Cleaning and Inspection  Copper Ion Generation Treatment and Next Steps Zebra Mussel Activity July 2018 September 2018 January 2019 Zebra Mussel Activity Zebra Mussel Activity 9/22/2017 300 Tom Miller Dam Mansfield Dam Water Temperature 4/10/2018 10/27/2018 5/15/2019 12/1/2019 6/18/2020 1/4/2021 7/23/2021 2/8/2022 35 ) L / S R E G I L E V ( Y T I S N E D R E G I L E V 250 200 150 100 50 0 C ° , E R U T A R E P M E T R E T A W 30 25 20 15 10 5 0 Zebra Mussel Public Outreach Press Release issued October 26, 2020 Copper Sulfate Treatment Copper Sulfate Treatment  Remove growth and accumulation within treatment plant infrastructure without impacting water source  Handcox Copper Sulfate System operational since summer 2019  Ullrich and Davis Copper Sulfate System operational since summer 2020  Copper sulfate systems are located outdoors (Ullrich and Davis) and reliant on chemical deliveries Validation of Effectiveness Control (No Copper Sulfate) Copper Sulfate Added Intake Cleaning and Inspection  Water treatment plant cleanings and inspections have occurred annually since 2019  Cleaning occurs within intake structures, pump casings, pump pits, etc.  Inspections have shown that cleanings are effective in reducing the accumulation of zebra mussels Ullrich WTP – Bay 1 Sluice Gate Sluice Gate – Pre-Removal Sluice Gate – Post-Removal Bay 1 Sluice Gate Stem – Pre-Removal Bay 1 Sluice Gate Stem – Post-Removal Ullrich WTP – Pump 2 and 3 Pump 2 Casing– Pre-Removal Pump 2 Casing– Post-Removal Pump 3 Casing– Pre-Removal Pump 3 Casing– Post-Removal Ullrich WTP – Bay 1 Bay 1 Trash Rack– Pre-Removal 2019 Bay 1 Trash Rack– Pre-Removal 2020 Bay 1 Trash Rack– Pre-Removal Apr 2021 Bay 1 Trash Rack– Pre-Removal Oct 2021 Bay 1 Trash Rack– Post-Removal Oct 2021 Davis WTP – Sluice Gate Stem Sluice Gate Stem – Pre-Removal Sluice Gate Stem – Post-Removal Handcox WTP – Upper Intake Screen 2019 Upper Intake Screen – Pre-Removal Spring 2021 Upper Intake Screen – Pre-Removal Fall 2021 Upper Intake Screen – Pre-Removal Spring 2021 Upper Intake Screen – Pre-Removal Copper Ion Generation (CIG)  Electrolysis of copper rods  Brine tank solution  Located within Low Service PS  Construction: Fall 2022 – Winter 2023  Modify copper sulfate systems for sodium permanganate feed Questions?