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Feb 2022 Boil Water Notice Austin Water and Wastewater Commission | February 16, 2022 Opening Comments Greg Meszaros Austin Water Director 2 Operations Overview Rick Coronado, P.E. Assistant Director, Operations 3 WHAT HAPPENED  Crews were filling a basin with water to begin treatment • A mixture of water and processed solids was added to “seed” the basin • This is a high turbidity mixture that is typically stopped after a few hours  “Seeding” was not stopped and continued for most of the night  Alarms and sample tests indicating high turbidity were recorded 4 WHAT HAPPENED  High turbidity water moved into water filters  Filters removed particles and produced water that met regulatory standards until they clogged  Multiple filters exceeded turbidity standards and entered the clearwells (underground storage tanks) 5 WHAT HAPPENED  Supervisory staff were notified to assess situation  Plant was shut down  Production was ramped up at Davis and Handcox to keep water flowing to customers  Water pressure and disinfection parameters remained consistent and within regulatory standards during this time 6 Davis Water Treatment Plant Handcox (WTP4) Water Treatment Plant INITIAL ACTIONS UNDERWAY  Meetings have been held with plant staff at each water treatment plant (Ullrich, Davis, Handcox)  Examining process control protocols  Examining training protocols  Reviewing alarm, testing & notification procedures for improvements 7 Questions