March 9, 2011 City Council Workshop

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March 9, 2011 City Council Workshop

  1. 1. Oak Harbor Facilities Plan<br />City Council Workshop<br />March 9, 2011<br />
  2. 2. Agenda<br />Project Schedule Update<br />Brief Review of Preliminary Alternatives<br />Overview of Evaluation Process<br />Proposed Alternatives and Sites<br />Summary/Next Steps<br />
  3. 3. Project Schedule Update<br />
  4. 4. Overall Project Schedule<br />
  5. 5. Planning and Preliminary Engineering Milestones<br />Short List 4 Alts<br />Identify Proposed Alt<br />Approval to Submit Plan<br />
  6. 6. Review of Preliminary Alternatives<br />
  7. 7. 2 WWTP Process Options<br />
  8. 8. 8 Candidate Sites(Public/US Navy Input + Technical Requirements)<br />
  9. 9. 3 Candidate Outfall Locations<br />Crescent HarborMitigate Shellfish Impact With Deep Diffuser<br />Oak HarborLimited Shellfish Impact<br />West BeachMitigate Shellfish Impact With Deep Diffuser<br />
  10. 10. Matrix of Preliminary Alternatives13 Alternatives, 8 Potential Sites<br />Oak HarborLimited Shellfish Impact<br />
  11. 11. TBL+ Comparison of Alternatives<br />
  12. 12. Technical and community objectives drive alternative selection<br />Technical considerations:<br />Reliable, safe, efficient treatment facility to meet current and future regulations<br />Community feedback:<br />Continue existing level of service<br />Control costs<br />Avoid open space/public impact<br />Implement a long-term solution<br />
  13. 13. TBL+ objectives developed to match input<br />Financial<br />Social<br />Environmental<br />Technical<br /><ul><li>T1
  14. 14. T2
  15. 15. T3
  16. 16. S1
  17. 17. S2
  18. 18. S3
  19. 19. E1
  20. 20. E2
  21. 21. E3
  22. 22. F1
  23. 23. F2
  24. 24. F3</li></li></ul><li> * Criteria matching Oak Harbor Comprehensive Plan<br />Environmental Objectives<br />
  25. 25. * Criteria matching Oak Harbor Comprehensive Plan<br />Social Objectives<br />
  26. 26. * Criteria matching Oak Harbor Comprehensive Plan<br />Technical Objectives<br />
  27. 27. * Criteria matching Oak Harbor Comprehensive Plan<br />Financial Objectives<br />
  28. 28. Financial analysis focused on comparing relative cost of alternatives<br />“Conceptual level”* costs developed for 3 major components:<br />Outfall3% - 5% of total<br />Conveyance3% - 20% of total<br />Treatment Plant80% - 90% of total<br /> * Expected accuracy is -50% to +30%<br />
  29. 29. “Unit cost” of treatment compared with multiple local MBR* projects as check<br />Blaine, WA<br />Oak HarborDesign Capacity<br /> * AS facilities typically cost 8% to10% less than MBR<br />
  30. 30. Other cost factors considered in comparative analysis<br />Project Contingency: 30%<br />Accounts for planning level uncertainty<br />Washington State Sales Tax: 8.7%<br />Allied Costs (Engineering, Legal, Admin): 25%<br />“Soft” project costs not related to construction<br />Escalation to Mid-point of Construction: 3% per yr<br />Assumes bidding in 2014<br />
  31. 31. 6 Alternatives are within 10% of lowestcost Alternative (3B)<br />Alternative 3BLowest Cost<br />
  32. 32. Proposed Alternatives & Sites<br />
  33. 33. Windjammer Park SiteAlternative 1: MBR with discharge to Oak Harbor outfall<br />Advantages<br />Low relative cost (~ 6% above lowest cost)<br />Most efficient use of infrastructure<br />Challenges<br />Facilities located in/near Windjammer Park<br />
  34. 34. Marina SiteAlternative 2A/B: MBR/AS with discharge to Oak Harbor outfall<br />Advantages<br />Low relative cost (3% to 9% above lowest cost)<br />Avoids facilities in/near Windjammer Park<br />Challenges<br />Inefficient use of infrastructure<br />Marina impact (MBR) or US Navy property (AS)<br />
  35. 35. Old City Shops SiteAlternative 3A/B: MBR/AS with discharge to Oak Harbor outfall<br />Advantages<br />Low relative cost (0% to 6% above lowest cost)<br />Avoids facilities in/near Windjammer Park<br />Relatively efficient use of infrastructure<br />Challenges<br />Places facilities in neighborhood area<br />
  36. 36. Beachview Farm SiteAlternative 4B: AS with discharge to Oak Harbor outfall<br />Advantages<br />Low relative cost (~ 3% above lowest cost)<br />Avoids facilities in parks/neighborhood areas<br />Opportunity for beneficial reuse of effluent<br />Challenges<br />Inefficient use of infrastructure<br />
  37. 37. Sites Proposed For Further Evaluation<br />
  38. 38. Summary and Next Steps<br />
  39. 39. Public Process Schematic<br />
  40. 40. Full TBL+ Summary ofPreliminary Alternatives<br />
  41. 41. AWindjammer<br />B/E<br />Marina<br />FOld City Shops<br />KPioneer<br />IBeachview<br />LNew Shops<br />JNavy East<br />MChevy Lot<br />SITE<br />
  42. 42. AWindjammer<br />B/E<br />Marina<br />FOld City Shops<br />KPioneer<br />IBeachview<br />LNew Shops<br />JNavy East<br />MChevy Lot<br />SITE<br />

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