City of Hailey, Idaho Woodside Water Reclamation Facility Planning Study Facility Plan Update Contents Executive Summary ........................................................................................................................................ 1 Planning Criteria .................................................................................................................................. 1 1.1 Study Area Conditions ............................................................................................................... 1 1.2 Background ............................................................................................................................... 1 1.3 Planning Area ............................................................................................................................ 1 1.4 Land Use and Development ...................................................................................................... 2 1.5 Local Conditions ........................................................................................................................ 3 1.5.1 Climatic Conditions ....................................................................................................... 3 1.5.2 Socio-Economic Conditions ......................................................................................... 3 1.6 Environmental Impacts .............................................................................................................. 3 2 Wastewater Flows and Loads ............................................................................................................. 5 2.1 Discharge Permit and Design Criteria ....................................................................................... 5 2.1.1 Effluent Discharge Permit Development and Schedule ............................................... 7 2.1.2 Compliance Schedule .................................................................................................. 7 2.1.3 DEQ Integrated Report................................................................................................. 7 2.1.4 Permit and Regulatory Issue Summary ....................................................................... 9 2.2 Historical Population ................................................................................................................ 10 2.3 Historical Influent Wastewater Characteristics and Trends .................................................... 11 2.3.1 Plant Influent Flow ...................................................................................................... 11 2.3.2 Influent BOD and TSS ................................................................................................ 12 2.3.3 Influent Nitrogen and Phosphorus .............................................................................. 13 2.3.4 Current Influent Flow and Load .................................................................................. 14 2.3.5 Per Capita Flow and Load .......................................................................................... 14 2.4 Future Flow and Load Projects ............................................................................................... 16 2.4.1 Population .................................................................................................................. 16 2.4.2 Future Influent Flows and Loads ................................................................................ 16 3 Current Plant Capacity and Performance ......................................................................................... 18 3.1 Existing Plant ........................................................................................................................... 18 3.1.1 Primary Treatment ...................................................................................................... 18 3.1.2 Secondary Treatment ................................................................................................. 22 3.1.3 Tertiary Treatment and Disinfection ........................................................................... 24 3.1.4 Solids Handling .......................................................................................................... 27 3.1.5 Equipment Summary .................................................................................................. 30 3.2 Plant Operation and Process Modeling ................................................................................... 34 3.2.1 Plant Operation with One SBR Out of Service ........................................................... 39 3.3 Plant Performance ................................................................................................................... 39 3.4 Capacity Evaluation Summary ................................................................................................ 46 4 Treatment Upgrade Alternatives ....................................................................................................... 50 4.1 Liquid Treatment Upgrades ..................................................................................................... 51 4.1.1 Alternative 1: Membrane Bioreactor ........................................................................... 51 4.1.2 Alternative 2: SBRs with Tertiary Membrane Filtration .............................................. 63 4.1.3 Alternative 3: SBRs with Tertiary Two-Stage Sand Filtration..................................... 71 4.2 Near-Term Upgrades .............................................................................................................. 77 4.2.1 Near-Term Aeration Upgrade ..................................................................................... 77 March 19, 2021 | i City of Hailey, Idaho Woodside Water Reclamation Facility Planning Study Facility Plan Update 4.2.2 Near-Term UV Upgrade ............................................................................................. 79 4.3 Alternative Analysis ................................................................................................................. 81 5 Water Reuse and Sludge Disposal ................................................................................................... 88 5.1 Treated Effluent Reuse ........................................................................................................... 88 5.1.1 Regulatory .................................................................................................................. 88 5.1.2 Irrigation Requirement ................................................................................................ 94 5.1.3 Reuse UV Treatment.................................................................................................. 94 5.2 Biosolid Management and Composting .................................................................................. 95 5.2.1 Drying Bed Operation ................................................................................................. 95 5.2.2 Composting Pilot Study .............................................................................................. 96 6 Support Facilities ............................................................................................................................. 102 6.1 Administration Buildings ........................................................................................................ 102 6.2 Electrical ................................................................................................................................ 102 6.3 Supervisory Control and Data Acquisition (SCADA) ............................................................. 104 6.3.1 SCADA Control System Network ............................................................................. 104 6.4 Collections System Overview ................................................................................................ 109 7 Summary of Upgrades and Implementation Schedule ................................................................... 110 7.1 Cost Summary ....................................................................................................................... 110 7.1.1 Cost Breakdown ....................................................................................................... 111 7.1.2 Operations and Maintenance ................................................................................... 111 7.2 Implementation ...................................................................................................................... 112 7.3 Project Financing ................................................................................................................... 117 7.3.1 Rate Structure .......................................................................................................... 117 7.3.2 Grant Programs ........................................................................................................ 118 7.3.3 Loan Programs ......................................................................................................... 118 8 References ...................................................................................................................................... 120 Tables Table 2-1: Active Permit Regulated Parameters from NPDES Permit No. ID0020303*............................... 6 Table 2-2: Summary of Anticipated Regulatory and Permitting Issues .......................................................