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Sewer Authority Mid-Coast Side Board Meeting

Wet Weather Flow Management Program Evaluation of Alternatives for Parallel Granada Force Main and Wet Weather Storage Facilities. Sewer Authority Mid-Coast Side Board Meeting. June 25, 2007. Presentation Outline. Purpose of study. Purpose of study. Confirmation of Whitley Burchett study.

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Sewer Authority Mid-Coast Side Board Meeting

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  1. Wet Weather Flow Management ProgramEvaluation of Alternatives for Parallel Granada Force Main and Wet Weather Storage Facilities Sewer Authority Mid-Coast Side Board Meeting June 25, 2007

  2. Presentation Outline • Purpose of study • Purpose of study • Confirmation of Whitley Burchett study • Confirmation of Whitley Burchett study • Four alternatives • Four alternatives • Recommended project • Recommended project • Comparison to alternatives for single Granada force main

  3. Purpose of Study • Confirm recommendations of WBA study of parallel force main • Confirm recommendation of WBA study of parallel force main • Update hydraulic model • Update hydraulic model • Evaluate alternatives for dual force main approach

  4. WBA Study • Results agree with updated hydraulic model • Results agree with updated hydraulic model • Will assume PVC for force main • Will assume PVC for force main • Gravity section downstream of force main limits flow – but no improvements required

  5. Alternative 3B10-Year, 6-Hour Event

  6. Montara Pump Station Hydrograph

  7. Portola Pump Station Hydrograph

  8. Parallel Force Mains Hydraulic Profile

  9. Gravity Sewer Hydraulic Profile

  10. WWTP Hydrograph

  11. Hydraulic Model Update - Results • Minor adjustments to controls can be made to Montara Pump Station to limit flow to Portola Pump Station • Minor adjustments to controls can be made to Montara Pump Station to limit flow to Portola Pump Station • Hydraulic capacity of parallel force main + gravity sewer is 7.1 mgd • Hydraulic capacity of parallel force main + gravity sewer is 7.1 mgd • Gravity sewer is limiting factor

  12. Storage at Portola Pump Station Not Needed If: • Replace pumps to provide 7.1 mgd • Replace pumps to provide 7.1 mgd • Add parallel, 14-inch force main • Add parallel, 14-inch force main • Raise junction box 2 walls • Raise junction box 2 walls • Add storage volume of 130,000 gal at WWTF

  13. Alternative 1

  14. Alternative 2

  15. Alternative 3

  16. Alternative 4

  17. Comparison of Alternatives – Costs in $M

  18. Portola Pump Station –Submersible Pump Conversion

  19. Portola Pump Station –Submersible Pump Conversion

  20. Storage Facilities at Portola Pump Station

  21. Buried large diameter storage pipes (length is 500’ each) Portola Pump Station IPS Pipeline

  22. Portola Pump Station –Dry-Pit Pump Replacement

  23. Wastewater Treatment Facility Overflow/Storage Facilities Storage Basin (Converted Aeration Basin 4)

  24. Cost Comparison – Dual Force Main versus Single Force Main(1) • Including project cost and contingencies. • Taken from 1/20/05 Project Memorandum to SAM, adjusted for current Engineering ENR + 25% correction for construction market.

  25. Aeration Basin 4 (Proposed wet weather storage basin)

  26. Overflow Structure Site at Wastewater Plant

  27. Portola Pump Station

  28. Portola Pump Station

  29. Portola Pump Station

  30. Rags Removed from Pumps

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