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HANDCOX Water Treatment Plant Resilience Improvements Charles Celauro, P.E. Engineering Services Assistant Director Water & Wastewater Commission February 14, 2024 Austin’s Water Supply: 325,000 Acre Feet Per Year Centralized Reclaimed System 2 Drinking Water Treatment Davis Plant (1954) – 118 MGD Ullrich Plant (1968) – 167 MGD Handcox Plant (2014) – 50 MGD ___________________________ Combined Water Treatment Capacity up to 335 Million Gallons per Day Handcox Resilience Improvements Provides baseline maintenance capacity of 50MGD:  Allows a minimum of 235MGD combined from all AW WTPs  Prepares AW for climate change impacts  Increases available treatment capacity during maintenance activities  Increases ability to handle solids  Does NOT rerate the plant for additional capacity beyond 50MGD Addresses:  Winter Storm Uri After Action Report and supported recommendations from the Winter Storm Working Group  Recommendations from the External Review 4 Winter Storm Working Group The WSWG was formed with members of this Commission to support AW in developing a thorough and objective review following Winter Storm Uri. The WSWG reviewed and prioritized the following recommendations:  Maintain available water production capacity at WTPs to meet demand planning criteria (CP-5).  Implement improvements at the WTPs to provide additional flexibility in maintenance scheduling (CP-6).  Increase sludge storage and disposal capabilities at treatment plants (CP-8). 5 Austin Water External Review Recommended planning to offset hot and cold climate change impacts:  Identify possible future scenarios, study such scenarios, identify possible solutions, and plan implementation programs for possible and probable future water quality and treatment challenges (2.7-3).  Prepare for sudden requests for additional water treatment (2.8-2). 6 Handcox WTP 7 Resilience Improvements Baseline Maintenance Capacity of 50 MGD Improvements  Additional up-flow clarifier  Additional sludge thickener  Additional sludge holding tank  Additional washwater settling basin  New treated water pumping 8 Resilience Improvements Additional Improvements:  New potable water pipeline between plant and the low-service pump station  Replacing Programmable Logic Controllers and network switches throughout the plant  Freight elevator for lime building (O&M) 9 Resilience Improvements Additional washwater settling basin Additional sludge thickener New treated water pumping 10 Programmable Logic Controllers Additional sludge holding tank Additional up-flow clarifier Freight Elevator Lime Building Resilience Improvements Proposed Potable Water Line 11 Questions?