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2008 Facility Plan Update

2008 Facility Plan Update. May 2008. Purpose. Comprehensive Plan through 2033 Builds on Past Work Adjust for Changing Conditions Identify Capacity, Compliance, and Rehabilitation needs Robert W. Hite Treatment Facility Biosolids Management Program Transmission System

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2008 Facility Plan Update

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  1. 2008 Facility Plan Update May 2008

  2. Purpose • Comprehensive Plan through 2033 • Builds on Past Work • Adjust for Changing Conditions • Identify Capacity, Compliance, and Rehabilitation needs • Robert W. Hite Treatment Facility • Biosolids Management Program • Transmission System • Develop Cost-Effective Capital Improvement Program • To meet Future (more stringent) Effluent Quality Requirements • Accommodate Growth • Renewal 2003 Wastewater Utility Plan • Denver Regional Council of Governments (DRCOG)

  3. Updates 2003 Facility Plan & 2002 Service Area Utility Plan, and 2007 Biosolids Study Updates 2003 Wastewater Utility Plan Includes PELs from Future Effluent Limits Study Incorporates North Secondary Improvements (PAR 942) Defines South Secondary Improvements (PAR 1085) Updates 2007 Land Use Model Updates Plant GPS-X and Hydraulic Models Updates Transmission System InfoWorks Model What’s Included in 2008 Update Does not include IS/Support facilities

  4. South Secondary Improvements • Parallel Track • Ammonia Compliance Deadline December 31, 2014 South Secondary Predesign Complete Predesign Mar 09 Develop Alternative Layouts and Costs Technical Team Review Define South Secondary Needs Complete Facility Plan Begin Facility Plan Jan 08 Feb 07 Jun 07 Jul 07 Aug 07 Mar 08

  5. Metro District Service Area 615 square miles and includes City and County of Denver and parts of Adams, Arapahoe, and Jefferson counties Six Drainage Basins

  6. Member Municipalities and Special Connectors 20 Member Municipalities and 25 Special Connectors

  7. Metro District Service Area Including Brighton and South Adams

  8. Population and Employment Projections • Projections based on: • Updated Member Municipality & Special Connector information • Current population, employment & boundary information from DRCOG • TAZ Data (Transportation Analysis Zones) • Buildout projections from the Land Use Model • Population – Increase 39% or 1.5% per year thru 2033 • Employment – Increase 52% or 2.0% per year thru 2033

  9. Flow and Load Projections • Unit Flow Factors • 85 gallons per capita per day • 17 gallons per day per employee • Developed Service Area Projections • Adjusted to Determine Primary Influent Flows and Loads • Exclusion of area tributary to a future Box Elder WWTP • Reduction in flow of 5 mgd for the Sand Creek Water Reclamation Facility • Additional loads, such as in-plant and hauled wastes • Increase in BOD loads from DIA

  10. Historic and Projected Primary Influent Flow and Loads

  11. Existing Robert W. Hite Treatment Facility Liquid Stream Capacity • Current max month rated capacity 220 mgd with EPC (~185 mgd Annual Average) • Capacity without EPC 161 mgd Annual Average (Secondary Treatment) • North and South Secondary Expansions required to meet capacity and regulatory requirements • RWHTF AAF capacity needs to be 210 mgd in 2033

  12. Existing Robert W. Hite Treatment Facility Solids Stream Capacity • Improvements to the digesters and high-solids centrifuges are planned during 2008-2013.

  13. Existing Transmission System Summary 219 miles of interceptors, 12 miles of force mains and 4 lift stations Capacity evaluation based on: Previous modeling from 2002 SAUP Updated Land Use Model Updates to existing InfoWorks Model

  14. Discharge Permit Requirements Anticipated to Change in Phases 4 and 5 Discharge Permit Requirements Anticipated to Change in Phase 2 Parameter Phase 4 2018-2023 Phase 5 Beyond 2023 Parameter Phase 2 2008-2013 Phase 3 2013-2018 Total ammonia, mg-N/L Daily maximum 7-day average 30-day average 21.5-30.0 – 9.7-15.0 6.2-12.7 1.7-2.2 2.0-4.6 Discharge Permit Requirements Anticipated to Remain Unchanged Through Planning Period Total nitrogen, mg-N/L Phasing Assumption Assumed Range 8 3-8 3 3-8 CBOD, mg/L 17 TSS, mg/L 30 Nitrates (plus nitrites), mg-N/L Daily maximum 7-day average 30-day average – 8.68 – – 8.68 – Total phosphorus, mg-P/L Phasing Assumption Assumed Range 0.5 0.04-1.0 0.04 0.04-0.10 Maximum chlorine residual, mg/L 0.011 pH range, standard units 6.0-9.0 Minimum dissolved oxygen, mg/L 3 Regulatory Assumptions

  15. Improvements and Project Implementation Transmission System improvements driven by rehabilitation needs and capacity constraints due to growth RWHTF improvements phased over planning period to meet capacity, regulatory, and rehabilitation needs Used recently developed Metro District Cost Estimating Guide for consistent and better cost estimates Recommended improvements “packaged,” according to type, location, and timing Construction Efficiencies Save Capital Costs Goal of the phased program is to continuously meet customer service and regulatory requirements through the end of the planning period

  16. Transmission System Rehabilitation • Inspection Program • Closed-circuit television and surface inspections • CCTV inspection annually on portion of system • CCTV taping of each interceptor every 10 years • Three categories based on degree of degradation • Transmission Division reviews to assess condition • Engineering Department performs second review, further refines the condition, develops a cost estimate and schedule

  17. Transmission System Rehabilitation • CIPP • Slip Lining • Manhole Rehab

  18. Transmission System Capacity Improvements • Transmission System hydraulic modeling • 2002 model updated with Sand Creek Basin Wastewater Master Plan • Model updated with revised population, employment, and unit flows • Model runs performed for 2007, 2015, and 2030 • Assumed northeast Service Area flows will continue to RWHTF • Flow data being collected to further refine model calibration in 2008

  19. Metro District Transmission System Capacity Concerns in 2015

  20. Metro District Transmission System Capacity Concerns in 2030

  21. Transmission System Project Implementation Schedule

  22. Basis for RWHTF Recommended Improvements • 2003 Facility Plan established basic direction • Five-stage air-activated sludge with BNR • Phasing out the high-purity oxygen system • North Secondary Improvements Project (PAR 942) • CaRRB process to address centrate treatment • Objective is to have similar processes in the North and South Complexes that operate and perform in a comparable fashion

  23. RWHTF Recommended Improvements

  24. RWHTF Project Implementation Schedule

  25. Projected Capital Expenditures $1.86 billion projected 2008-2033 $1,528,000,000 – RWHTF $332,000,000 – Transmission System

  26. Questions

  27. RWHTF Buildout Site Plan (230 mgd)

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