C8 nov20 city council meeting 121120_final

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C8 nov20 city council meeting 121120_final

  1. 1. Oak Harbor Facilities Plan City Council Meeting November 20, 2012Oh910i1-8594.pptx/1
  2. 2. Tonight’s Agenda/Objectives 1. Review scope and purpose of Amendment 5 2. Present results of field work completed through Amendment 5 – Topographical Survey – Environmental Assessment – Geotechnical Borings g 3. Summarize estimated cost impacts p 4. Gain direction from Council on next steps: – Resolution 12-33: Complete Facilities Plan for Windjammer Vicinity as defined by Resolution 12-17 – Resolution 12-34: Expand Windjammer Vicinity to include adjacent property and complete Facilities PlanOh910i1-8594.pptx/2
  3. 3. Resolution 12-17 (August 14, 2012) • Proceed with Facilities Plan based on Windjammer Vicinity j y • Minimize space impacts on Windjammer Park to the extent possible • C ti Continue public process: bli – Define the best location within the Windjammer Vicinity Vicinit – Define layout and other desirable features based on the final locationOh910i1-8594.pptx/3
  4. 4. Amendment 5 Scope and Purpose • Technical detail to help select the best location (3 to 4 acres) for the new WWTP • Field work including:g – Phase 1 topographical survey to establish elevations and flood protection requirements – Environmental assessment to better define permitting and wetland mitigation requirements – Geotechnical borings to characterize soils better soils, estimated design requirements and costOh910i1-8594.pptx/4
  5. 5. October 16, 2012 City Council Direction • Include adjacent property (Freund property) in scope of Amendment 5 Does Freund property provide technical/cost advantages relative to Windjammer Vicinity?Oh910i1-8594.pptx/5
  6. 6. Amendment 5 Current Status • Phase 1 survey work complete (Attachment 1) • Environmental assessment completed based on October 30, 2012 site visit (Attachment 2) , ( ) • Geotechnical borings completed on October 30 and 31 (Attachment 3) • Additional engineering analysis completed to compare three sites – Windjammer Vicinity (Charrette) – Freund – Windjammer Vicinity (Alternate)Oh910i1-8594.pptx/6
  7. 7. Field Work Summary Phase 1 Topographical SurveyOh910i1-8594.pptx/7
  8. 8. 100-Year Floodplain (El 12.5 NAVD 88) 15 9 100-Year Floodplain Fl d l i 12.5 feet ~7Oh910i1-8594.pptx/8
  9. 9. Regulations for Floodplain Development • Orange Book ( g (Criteria for Sewage Works Design, ’08) g g , ) – G2-1.5.2 Flood Protection: Locate unit processes above the 100-year flood/wave action or adequately protect from 100-year fl d/ t tf 100 flood/wave action ti • Oak Harbor Municipal Code 17.20 – 17 20 190(2) Nonresidential Construction: Locate 17.20.190(2) construction above the base flood elevation or floodproof structure to 1 ft above base flood elevation – 17.20.190(3) Critical Facilities: • Construction permissible if no feasible alternative • Lowest floor > 3 feet above base flood elevationOh910i1-8594.pptx/9
  10. 10. Summary of Flood Protection Requirements • Portions (or all) of sites being considered lie within 100-year flood plain (12.5 NAVD 88) – R Recommend elevating grade and/or structures t 13 5 d l ti d d/ t t to 13.5 – Additional protection for “critical facilities” (e.g. electrical) • Southern portions of Windjammer Vicinity sites must be p j y elevated approximately 3 f l d i l feet – Retaining wall or sloped fill • Existing grade at Freund property is an average of ~6.5 feet 6.5 below 100-year flood elevation – Retaining wall/levee – Fill site – New/improved access to site is needed • 100-year flood elevation [+12.5] more conservative than Mean Higher High Water (MHHW) + sea level rise [approx + 11 3] [approx. 11.3]Oh910i1-8594.pptx/10
  11. 11. Field Work Summary Environmental AssessmentOh910i1-8594.pptx/11
  12. 12. Summary of Environmental Assessment • Wetland ditches at both Windjammer (Charrette) and Freund sites • Federal, state, Oak Harbor permit approvals required for wetland fill/buffer impacts fill/b ff i t • Windjammer (Charrette) Site – Wetland ditch along southern boundary may be filled as result of p j g y y project – Mitigation costs estimated between $150,000 and $275,000 – Risk of delays and/or cost increases relatively low (limited tidal water connection) • Freund Site – Wetland ditches along boundaries would be filled as result of project – Site adjacent to mitigation wetland; portion may be filled for access – Mitigation costs estimated from $400,000 to $800,000 – Risk of delays and/or cost increases relatively high (tidal water connection; impact to previous mitigation wetland)Oh910i1-8594.pptx/12
  13. 13. Field Work Summary Geotechnical AssessmentOh910i1-8594.pptx/13
  14. 14. Geotechnical Boring Site PlanOh910i1-8594.pptx/14
  15. 15. Geotechnical Cross SectionsOh910i1-8594.pptx/15
  16. 16. Geotechnical Cross SectionsOh910i1-8594.pptx/16
  17. 17. Summary of Geotechnical Assessment • Ground improvements needed at all sites • Dewatering shoring, and flood protection will Dewatering, shoring also impact cost j • Sites to north, west and center of Windjammer Vicinity are preferred – Highest ground elevation – Sh ll Shallowest t till (25 to 30 f t) t to t feet) • Park site: deeper to till; additional flood control • Freund east sites most difficult/costly Freund, – Lowest ground elevation – Deepest to till (40+ feet) (40Oh910i1-8594.pptx/17
  18. 18. Cost ComparisonOh910i1-8594.pptx/18
  19. 19. Windjammer Charrette Concept Conceptual Plan View (August 14 2012) 14,Oh910i1-8594.pptx/19
  20. 20. Windjammer Charrette Concept Conceptual Site Section View (August 14 2012) 14,Oh910i1-8594.pptx/20
  21. 21. Total Project Cost Components Windjammer ( j (Charrette) Layout ) y $100 $95 $2.9 $93.5 $93 5 (Total) $90 $7.6 $85 $83.0 $83 0 (WWTP) Estimated Cost (Millions) $80 Outfall $75 WW Conveyance Co eya ce WWTP $70 $83.0 $65 $60 $55 $50 Windjammer (Charrette)Oh910i1-8594.pptx/21
  22. 22. WWTP Project Cost Components Windjammer ( j (Charrette) Layout ) y $90 $83.0 (WWTP) $80 $15.0 $70 $2.1 $68.0 (Construction + Land) $60 Estimated Cost (Millions) $50 Soft Costs (25%) Land Acquisition Land Acquisition $40 WWTP Construction $65.9 $30 $20 $10 $0 Windjammer (Charrette)Oh910i1-8594.pptx/22
  23. 23. Approximately 17% of WWTP Costs are “Variable” Based on Site $90 $80 $70 $68.0 (Construction + Land) $11.7 $60 (“Variable”) ( Variable ) $5.2 $5 2 d Cost (Millions) $56.3 (“Fixed”) Land Acquisition Architectural Premium $50 Added Structural Geotechnical Premium Estimated $40 Wastewater/Effluent Piping Sitework $30 Base WWTP $56.3 $20 $10 $0 Windjammer (Charrette)Oh910i1-8594.pptx/23
  24. 24. Sitework is Largest Variable Cost Component $12.0 $11.7 (“Variable”) $11.0 $2.1 $10.0 $9.0 $1.6 $8.0 $8 0 d Cost (Millions) ) $0.8 Land Acquisition $7.0 Architectural Premium $1.7 $6.0 Added Structural Estimated $0.4 Geotechnical Premium $5.0 Wastewater/Effluent Piping Sitework $4.0 $3.0 44% $5.2 $2.0 Sitework $1.0 $0.0 Windjammer (Charrette)Oh910i1-8594.pptx/24
  25. 25. Sitework Cost Elements Windjammer ( j (Charrette) Layout ) y $7.0 $6.0 $6 0 $5.2 Sitework $5.0 $1.2 Site d Cost (Millions) Allowances $4.0 Allowance (Wetlands Mitigation) Allowance (Flood Protection) Allowance (Stormwater Mgmt.) ( g ) Estimated $3.0 Allowance (Clear/Demo) Base Sitework Estimate $2.0 $1.0 $0.0 Windjammer (Charrette)Oh910i1-8594.pptx/25
  26. 26. Property Adjacent to Windjammer Vicinity Conceptual Plan ViewOh910i1-8594.pptx/26
  27. 27. Property Adjacent to Windjammer Vicinity Conceptual Site Section ViewOh910i1-8594.pptx/27
  28. 28. Offsetting Costs for Alternate (Freund) Property Relative to Windjammer ( j (Charrette) Layout ) y Lower Cost Higher Costs • Property acquisition • Wastewater/effluent (Assessed value) conveyance • Demolition/clearing • Geotechnical • Aeration basin structure • Sitework – Flood Protection – Wetland MitigationOh910i1-8594.pptx/28
  29. 29. Sitework Cost Element Comparison Windjammer ( j (Charrette) & Freund Layouts ) y $7.0 Allowances $6.0 $6 0 increase due to Flood Protection and Wetlands $5.0 Mitigation d Cost (Millions) ) $4.0 Allowance (Wetlands Mitigation) Allowance (Flood Protection) Allowance (Stormwater Mgmt.) Estimated $3.0 Allowance (Clear/Demo) Base Sitework Estimate $2.0 $1.0 $0.0 Windjammer (Charrette) FreundOh910i1-8594.pptx/29
  30. 30. Windjammer Alternate Concept Conceptual Plan and Perspective View (8/14/12)Oh910i1-8594.pptx/30
  31. 31. Lower Costs for Windjammer (Alternate) Layout Relative to Windjammer ( j (Charrette) Layout ) y Same Cost Lower Costs • Property acquisition • Aeration basin structure (Assessed value) • Geotechnical • Demolition/clearing • Sitework • Wastewater/effluent – Flood Control conveyance – Wetland MitigationOh910i1-8594.pptx/31
  32. 32. Sitework Cost Element Comparison Windjammer ( j (Charrette) & Windjammer ( ) j (Alternate) ) $7.0 Allowances $6.0 decrease due to Flood Protection $5.0 and Wetlands Mitigation ns) ed Cost (Million $4.0 Allowance (Wetlands Mitigation) Allowance (Flood Protection) Allowance (Stormwater Mgmt.) Estimate $3.0 $ Allowance (Clear/Demo) Base Sitework Estimate $2.0 $1.0 $0.0 Windjammer  Freund Windjammer  (Charrette) (Alternate)Oh910i1-8594.pptx/32
  33. 33. “Variable” Cost Comparison for All Sites $12.0 $11.7 $11.3 $11.0 $10.1 $10.0 $9.0 $8.0 Land Acquisition $7.0 Architectural Premium $6.0 Added Structural Geotechnical Premium G t h i lP i $5.0 Wastewater/Effluent Piping Sitework $4.0 $3.0 $2.0 $ $1.0 $0.0 Windjammer (Charrette) Freund Windjammer (Alternate)Oh910i1-8594.pptx/33
  34. 34. “Variable” Cost Comparison for All Sites Estimated Costs Shown in Millions ($) ( ) Windjammer Windjammer (Charrette) Freund (Alternate) Land Acquisition L dA i iti $2.1 $2 1 $0.2 $0 2 $2.1 $2 1 Architectural Premium $1.6 $1.6 $1.6 Added Structural $0.8 $0.0 $0.0 Geotechnical Premium $1.7 $2.6 $1.4 Wastewater/Effluent Piping $0.4 $0.8 $0.4 Base Sitework (Fixed) $4.0 $4.0 $4.0 Clearing & Demolition Allowance $0.2 $0.0 $0.2 Stormwater Management Allowance $0.4 $0.4 $0.4 Flood Protection All Fl d P i Allowance $0.4 $ $1.3 $ $0.1 $ Wetlands Mitigation Allowance $0.3 $0.4 $0.0 Subtotal, Sitework $5.2 $6.1 $4.6 Total Site Specific Items $11.7 $11.3 $10.1Oh910i1-8594.pptx/34
  35. 35. Total Cost Comparison for All Sites $100.0 $93.5 $93.1 $92.0 $90.0 $80.0 $70.0 d Cost (Millions) ) $11.7 $11.3 $10.1 $60.0 Soft Costs Outfall $50.0 Conveyance Estimated Site Specific Items $40.0 Base WWTP $30.0 $20.0 $10.0 $0.0 Windjammer (Charrette) Freund Windjammer (Alternate)Oh910i1-8594.pptx/35
  36. 36. Summary of Technical & Cost DifferencesOh910i1-8594.pptx/36
  37. 37. Summary and Conclusions 1. Based on assessed value Freund site will likely be less costly to acquire 2. Based on technical field work, Freund site will likely have higher construction cost – Wastewater/effluent Conveyance – Geotechnical – Flood Protection – Wetland Mitigation W l d Mi i i 3. Very little difference in overall cost between sites 4. Means to reduce the cost of “variable” components will be variable considered regardless of tonight’s decision 5. Freund site presents higher risk due to environmental permitting and regulations for filling within the flood plainOh910i1-8594.pptx/37
  38. 38. Next StepsOh910i1-8594.pptx/38
  39. 39. Paths Forward Based on Tonight’s Decision Retain Windjammer Vicinity Expand Windjammer Vicinity (Freund) Resolution 12-33 Resolution 12-34 1. Complete draft technical chapters of p p 1. Amendment 6: Collect community y Facilities Plan input; compare locations using TBL+ 2. Develop phasing/financing plan 2. Select final location/layout for WWTP with public input (Q1, 2013) 3. Final Public Open House/Council Workshop (Early 2013) 3. Complete draft technical chapters of Facilities Plan 4. Council resolution to submit draft plan 4. Develop phasing/financing plan (Q1, (Q1 2013) 5. Final Public Open H Fi l P bli O House/Council /C il 5. Complete environmental documents Workshop (Q2, 2013) for approval 6. Council resolution to submit draft plan 6. Begin Preliminary Design (Q2, 2013) a. Final location & layout of WWTP 7. Complete environmental documents for with community input approval b. Equipment procurement 8. Begin Preliminary Design g y g a. Final layout of WWTP with community inputOh910i1-8594.pptx/39 b. Equipment procurement
  40. 40. Questions?Oh910i1-8594.pptx/40

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