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Wet Weather Improvements Project

Wet Weather Improvements Project. North Bay Watershed Association Board Meeting. November 2, 2007. Presentation Outline. About CMSA The Wet Weather Challenge 12/31/05 Rain Event Wet Weather Improvement Project How to pay for the Project What is Happening Now Questions/Comments .

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Wet Weather Improvements Project

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  1. Wet Weather Improvements Project North Bay Watershed Association Board Meeting November 2, 2007

  2. Presentation Outline • About CMSA • The Wet Weather Challenge • 12/31/05 Rain Event • Wet Weather Improvement Project • How to pay for the Project • What is Happening Now • Questions/Comments rc1005cmsa.ppt

  3. About CMSA rc301nwea.ppt

  4. About CMSA - History • CMSA Joint Powers Agreement in 1979 • City of Larkspur • San Rafael Sanitation District • Ross Valley Sanitary District • Sanitary District #2 (Corte Madera) • CMSA constructed in early 1980s • Located in San Rafael (Andersen Drive) • Began operation in May 1985 • Replaced four small plants in Central Marin rc1005cmsa.ppt

  5. CMSA Service Area rc1005cmsa.ppt

  6. About CMSA - Governance • Appointed Board of Commissioners • Al Boro, San Rafael council, 16 years • Paul Cohen , San Rafael council, 15 years (retired) • Bob Sinnott, Larkspur Fire Chief, 4 years • John Dupar, Corte Madera council, 2 years • Sue Brown, Ross Valley Sanitary, 1.5 years • Pat Guasco, Ross Valley Sanitary, 1.5 years rc1005cmsa.ppt

  7. About CMSA rc1005cmsa.ppt

  8. About CMSA - Services • Treatment & Disposal of Wastewater • Treatment & Disposal of Biosolids • Source control regulation – commercial/industrial • Public education – Marin County • Contract Services • Pump station O&M for Corte Madera • Source control/FOG management for LGVSD • FOG management with Ross Valley and San Rafael • Financial administration for San Rafael San - pending rc1005cmsa.ppt

  9. About CMSA - Operations • 40 staff members • Administrative, Finance, & Engineering • Operations, Maintenance, & Electrical • Laboratory, Environmental Compliance • Fiscal Year 2007/2008 Budget • $ 9 Million Operating • $ 18 Million Capital • Treat about 11 Million Gallons per Day (MGD) • Serve about 110,000 customers, incl San Quentin rc1005cmsa.ppt

  10. The Wet Weather Challenge rc301nwea.ppt

  11. The Wet Weather Challenge • Average dry weather flow is 8 MGD • Wet Weather Flow has reached almost 115 MGD (14.5 x increase) • Wet Weather flows increased over 90% since 1985 • Caused by infiltration/inflow in collection systems • Increase has been 85+% at each member agency • Reason is increased pumping capacity by JPA members and deteriorating pipelines • Local solution to minimize sewer overflows • Does not consider regional impacts rc1005cmsa.ppt

  12. Wet Weather Challenge 90 mgd Maximum Plant Treatment Capacity rc1005cmsa.ppt

  13. Flows vs Growth Member Agency EDUs 9% growth over period Member Agency Flows 74% growth over period rc1005cmsa.ppt

  14. December 31st Storm rc301nwea.ppt

  15. December 31st storm • Peak Flow @ 115 MGD (historic maximum) • 100 MGD+ for 14 hours • Emergency contingency plan used • Monitor storm front (Doppler radar), tides, & flow • Back flow into plant – try not to flood; then • Balance filling pond with backing up flow; then • Contain spilling to on-site storm drain ditches; while • Protecting process equipment (electrical) & biomass • Worst case – flood plant and spill off-site rc1005cmsa.ppt

  16. Aerial Photo N rc1005cmsa.ppt

  17. Blending Channel Spilling rc1005cmsa.ppt

  18. Secondary Clarifier Flooding rc1005cmsa.ppt

  19. Overflowing at Contact Tank Deck rc1005cmsa.ppt

  20. Spilling out of the Contact Tanks rc1005cmsa.ppt

  21. Flooding at the Chlorine Bldg rc1005cmsa.ppt

  22. Flow Out of the Pond rc1005cmsa.ppt

  23. Wet Weather Improvement Project (WWIP) rc301nwea.ppt

  24. WWIP - Goals Prevent overflows and meet treatment requirements Restore Existing Storage Pond Capacity Accommodate a 5-Year Design Event Accommodate a 125 mgd Collection System Hydraulic Limit rc1005cmsa.ppt

  25. WWIP - Wet Weather Flow Improvement • Increase treatment capacity • Polymer facility, 2 primary clarifiers, secondary improvements, 2 chlorine contact tanks • Increase hydraulic capacity • 155 MGD effluent pump station & standby power • Outfall strengthening improvements • Expand storage pond to 7 million gallons rc1005cmsa.ppt

  26. Layout of Key WWIP Facilities Legend Existing Facilities New WWIP Facilities New O&M Improvements rc1005cmsa.ppt

  27. Master Project Schedule Notes: (1) Schedule represents improvements for 125 mgd collection system hydraulic limit for 5 year design flow event. 2010 2005 2006 2007 2008 2009 Activity (1) Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Study Predesign Finance/Rate Planning CEQA Debt Issuance 50% 100% 90% Final Design Bid/Award Construction Permit Renewal Submitted Report of Waste Discharge rc1005cmsa.ppt

  28. How to pay for the Project rc301nwea.ppt

  29. WWIP - Project Costs (1) Based on ENR of 9460 at mid-point of construction (December 2008).(2) Pond provided for plant operational flexibility. rc1005cmsa.ppt

  30. How to Pay for the WWIP • Board forms a finance committee to consider pay-as-you-go or debt issuance scenarios • Committee recommends and Board approves issuing tax-exempt revenue bonds • Debt issuance process through summer of 2006 • $69 million in bonds sold in October 06 at 4.33% • Proceeds fund the WWIP and CIP to FY11/12 rc1005cmsa.ppt

  31. What is Happening Now? rc301nwea.ppt

  32. What is Happening at CMSA • Effluent Storage Pond enlargement will be completed in late November 2007 • Outfall Improvements @ 50% design • WWIP – contract awarded in September • Notice-to-Proceed issued in October • Preconstruction conference and Partnering Workshop held • Construction has focused on staging area development, clearing & grubbing, installing fencing. rc1005cmsa.ppt

  33. What is Happening at JPA Agencies • San Rafael San has raised its raised from $26/month to $54/month over 5 years to support 80 yr rehabilitation program • Corte Madera raised rates from $15/month to $42/month to support a 40 yr replacement program • Ross Valley Sanitary District has completed system wide studies and developed a 10-yr CIP. Their rate will likely be raised next year • Each district has accelerated their pipeline replacement activities. rc1005cmsa.ppt

  34. Effluent Pond Project rc1005cmsa.ppt

  35. Effluent Storage Pond Project rc1005cmsa.ppt

  36. Rendering of CCTs and Pump Station rc1005cmsa.ppt

  37. Rendering of New Clarifiers rc1005cmsa.ppt

  38. Questions/Comments rc301nwea.ppt

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