Slides presented during Public Hearing_112823
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These are slides from a November 28, 2023 public hearing about the Town of Centreville Wastewater Treatment Plant Comprehensive Water and Sewer Plan upgrade. The presentation outlines a phased build-out approach tied to engineering and growth planning, lists project milestones (RFP, approvals, bid invitations, award, construction), and identifies partnerships with county growth plans and the Department of Health. It documents current capacity concerns (average flows over 80% of permit, some years >90%), the need to improve treatment performance at high flows and solids handling, and a proposed upgrade to year‑round enhanced nutrient removal using an MBR (ENR) process plus screening, grit removal, UV disinfection, and solids stabilization/dewatering. Funding needs and options are detailed: a total project cost of $38,278,008 with specific grants and loans noted (BRF ~$14.9M, COS ~$2.15M, ARPA ~$2.5–3.3M, Rural Development $500k, possible $14.9M loan with potential state grants), and discharge options compared (spray field with large costs vs. direct enhanced stream discharge described as most viable and cost‑effective).
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TOWN OF CENTREVILLE WASTEWATER TREATMENT PLANT COMPREHENSIVE WATER AND SEWER PLAN UPGRADE DISCUSSION NOVEMBER 28, 2023 Upgrade Approach A Plan for phased build-out that considers engineering comprehensive and growth B planning dependencies. Fiscal: Finalize funding streams from Federal and State budget negotiations. Alignment for phased funds over 2 or Engineering: more state and/or federal budgets. Move towards enhanced nutrient Source grant funding where removal treatment/filtering and applicable. discharge technologies General Project Milestones Farm Purchase/Steam Planning Discharge and Design Invitations to Bid Construction Funding b d f h j a c e g i QAC Comp Water and Sewer MDE Contingent Draft RFP ROM 4-years Plan/Centreville Comp Plan Approvals Award to upgrade Partnerships and Alignment COUNTY GROWTH PLANS CENTREVILLE ALIGNMENT ▪ 304/301 Interchange ▪ Upgrade WWTP to meet both Town and County ▪ Infill Development Growth and Comprehensive ▪ Business Park Development Plans ▪ Mixed Commercial Use ▪ Denial of service line ▪ Department of Health - extension. failing septic system ▪ Sanitary Enclave Variables • Planning and Design • Shift to modern filtering technologies (Membrane) • Upgraded software • Size/Capacity • Allocation Fees for future improvements or expansion • Support Town and County growth and planning efforts • Discharge Options • Spray Field and access infrastructure • $12M+ for the field • $1M per mile to reach the field (total miles/total cost) • Direct Enhanced Stream Discharge (most viable and cost-effective) • Extend past Watson Rd Bridge (cost) Grants a. BRF - ~$14.9M (In Current Budget) b. COS - ~$2.15M c. ARPA - ~$2.5 - $3.3M (Spray Field) d. Rural Dev. - $500,000 (Commerce) Loans a. Loan $14.9M (possibly offset with an annual $5M state grant disbursed every year for the next 3 years) Revenue Streams Total Cost a. $38,278,008 WWTP Upgrade and Expansion 1. Average flows have exceeded 80% of permit capacity • Some years exceeded 90% 2. Treatment performance challenging during high flows 3. Solids handling and disposal operations need to be upgraded Current Configuration Water Treatment Well Aquifer Plant Households/ Businesses BNR Stream Wastewater Discharge Plant (Dec - Mar) (0.542 MGD) Spray Holding Field Pond (Apr - Nov) Upgrade and Expansion Plan Drinking Water Well Aquifer Treatment Plant Households/ Businesses Extended Stream ENR - MBR Discharge Wastewater (0.458 – 1 MGD) Plant (1 MGD) Increase (Year Round) Capacity & Modernize Existing Existing Spray Holding Field (0.542 MGD) Pond (Apr–Nov) Proposed WWTP Upgrade and Expansion 1. Liquid Treatment a) Screening and Grit Removal b) Flow Equalization c) Activated Sludge MBR Process (ENR) d) UV Disinfection e) Effluent Pumping 2. Solids Treatment a) Sludge Stabilization (Class B) b) Dewatering/Storage c) Land Application Existing Stream Discharge Existing Stream Discharge WWTP Proposed Extended Stream Discharge Extended Stream Discharge Outfall Area WWTP DISCUSSION