Item 11 Briefing Wastewater CIP — original pdf

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Wastewater Capital Improvements Water & Wastewater Commission September 11, 2024 Charles Celauro, PE Assistant Director, Engineering Services Agenda 1. Wastewater System Overview 2. Capital Improvement Projects a. Walnut Creek WWTP b. Wastewater Treatment Plants c. Odor Control Facilities d. Wastewater Collection System e. Wastewater Lift Stations 2 Brushy Creek East WWTP ** Dessau PP OSCAR and CLARA Walnut Creek WWTP Hornsby Bend Biosolids Mngt Plant Thoroughbred Farms PP Wildhorse PP Taylor Lane PP South Austin Regional WWTP Pearce Lane PP Wastewater by the Numbers  Austin Water Statics:  2,900 Miles of Gravity Lines  59,000 Manholes  137 Lift Stations  78 Miles of Force Mains  9 Decentralized Package WWTP  1 Fractional Ownership Plant (Brushy Creek East WWTP) (**COA Ownership 9.87%)  2 Regional Wastewater Treatment Plants (Walnut Creek & South Austin Regional WWTP)  1 Biosolids Plant (Hornsby Bend Biosolids Management Plant) Balcones PP River Place PP Lost Creek PP LEGEND Regional WWTP Solids Management Plant Package Plant (PP) Brushy Creek East WWTP Expansion 3 Future Wastewater Investments Nearly 50% of capital spending is dedicated to wastewater improvements Wastewater treatment process conversion to Biological Nutrient Removal (BNR) Rehabilitation and renewal of treatment facilities, lift stations, pipelines and manholes Inspection of wastewater lines and manholes and smoke testing Interdepartmental coordination Mobility projects relocations and betterments In-situ wastewater line renewal program Spot repairs of wastewater lines and manholes Maintain increased flows 4 Walnut Creek WWTP 5 WALNUT CREEK WWTP Treatment Capacity 1977 – 18 MGD 1987 – 40 MGD 1990 – 60 MGD 2005 – 75 MGD 6 WALNUT CREEK WWTP Rehabilitation and Renewal Projects 2000 – Reclaimed Water 2002 – Headworks #2 2009 – Electrical Distribution 2013 – Reclaimed Water 2017 – Tertiary Filter 2019 – Secondary Treatment 2020 – Sludge Thickener 2020 – Pump Replacements 2021 – Plant Control & Network 2022 – Gas Scrubber 7 Treatment Plant Expansion and Enhancement  Rehabilitation projects  New 25 MGD expansion with nutrient removal and UV disinfection  Convert existing 75 MGD with nutrient removal and UV disinfection  Plant protection from high flow events and flood waters Package Plants 9 Brushy Creek East WWTP ** Wastewater Treatment Plant Rated Capacity (MGD) Dessau PP OSCAR and CLARA Walnut Creek WWTP Hornsby Bend Biosolids Mngt Plant Thoroughbred Farms PP  South Austin Region WWTP  Walnut Creek WWTP Wildhorse PP  Package Plants 75.0 MGD 75.0 MGD 3.32 MGD Taylor Lane PP South Austin Regional WWTP Pearce Lane PP Plant Expansions (MGD)  Walnut Creek WWTP 100.0 MGD  Package Plants Wildhorse Package Plant 2.50 MGD Taylor Package Plant 0.60 MGD Brushy Creek WWTP (2024) 3.26 MGD Balcones PP River Place PP Lost Creek PP LEGEND Regional WWTP Solids Management Plant Package Plant (PP) Brushy Creek East WWTP Expansion 10 Odor Control Facilities 11 Odor Control Facility Projects Greater Walnut Balcones Odor Control Greater Walnut Loyola Odor Control Cross Town Odor Control Cross Town Greater Walnut Little Walnut Upper Williamson Williamson Onion Williamson Odor Control LEGEND Collection System Odor Control Onion Odor Control 12 Wastewater Collection 13 Wastewater Collection System 5-Year CIP Investments across Austin • Rehabilitate aged infrastructure • Reduce sanitary sewer overflows • Collaborate with mobility and drainage projects • Plan for growth 14 Notable Wastewater Collection Projects Upper Harris Branch Wastewater Interceptor Upper Tannehill Wastewater Improvements Williamson Creek Wastewater Interceptor 15 Wastewater Collection System Pipeline Projects Williamson Creek Wastewater Interceptor • 18,800 Linear Feet of 72" gravity wastewater Scope: interceptor Benefits: • Increase system reliability and reduce risk of sanitary sewer overflows • Decrease long term operation and maintenance costs associated with aged infrastructure • Minimize environmental impacts Construction Cost Estimate: $102 Million 16 Wastewater Collection System Pipeline Projects Scope: • Phase 1 - 10,700 Linear Feet of 36" to 42" gravity interceptor • Phase 2 – 12,000 Linear Feet of 24" to 36" gravity interceptor • Relieve Dessau WWTP and various Lift Stations Upper Harris Branch Wastewater Interceptor Benefits: • Provide capacity for growth • Abandon lift stations • Relieve flows to Dessau WWTP • Abandon Dessau WWTP Construction Cost Estimate: • Phase 1 - $35.2 Million • Phase 2 - $32.4 Million 17 Wastewater Collection System Pipeline Projects Upper Tannehill Wastewater Improvements: Morris Williams Scope: • 4,500 Linear Feet of 42” and 48” gravity line within Morris Williams Golf Course Benefits: • Increase system reliability and reduce risk of sanitary sewer overflows • Collaboration between Austin Water, Parks and Recreation Department, and Watershed Protection Department Construction Cost Estimate: $19 Million 18 Lift Stations 19 Four Points #2 Lift Station Abandonment Boulder Lane Lift Station Rock Harbour Lift Station and Force Main Great Hills Lift Station Wastewater Lift Station CIP Rock Harbour Force Main and Four Points #2 Abandonment • Four Points #2 Located in Balcones Canyonlands Conservation Plan property Increases lift station capacity Great Hills Lift Station • Brings up to current AW standards • Remove from 100-year floodplain Boulder Lane Lift Station • Rock Harbour Lift Station • Springfield Lift Station Abandonment • Located in 25-year floodplain • 3,300 linear feet of 36-inch gravity interceptor Increases lift station capacity Springfield Lift Station Abandonment 20 Lift Stations and Back Up Power Resiliency Lift Stations 141 137 132 132 134 133 133 129 129 129 126 Fixed Lift Station Generators 91 95 85 71 109 101 117 119 2023 2024 2025 2026 2027 2028 2029 2030 Generator Fleet 130 122 138 140 112 116 103 82 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2023 2024 2025 2026 2027 2028 2029 2030 21 Questions?