Transbay Presentation Sustainable Silicon Valley

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Presentation given at Sustainable Silicon Valley Water Summit on December 7, 2009. (Updated)

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Transbay Presentation Sustainable Silicon Valley

  1. 1. Jenny Henry, PWP Landscape Architecture Claire Johnson, Atelier Ten Environmental Consultants Paul Kephart, Rana Creek Ecological Consultants TRANSBAY TRANSIT CENTER
  2. 2. Market Street
  3. 3. Transbay Transit Center Design Competition Project Goals: • an “urban catalyst” • an “urban purifier” Sustainable Design Guidelines: • Site Design and Planning • Water Management
  4. 4. SCOPE DOCUMENTS ROOF PROPOSAL (courtesy HOK)
  5. 5. DESIGN COMPETITION Pelli Clarke Pelli Architects Team
  6. 6. Transbay Transit Center Rooftop
  7. 7. TRANSBAY TRANSIT CENTER ROOFTOP PARK Park Design Aspirations: Fully inhabitable public park for neighborhood residents and transit users: Open lawn area Botanical planting Main plaza with café and seating Children’s play areas Amphitheater and stage Sustainable Aspirations: Decrease Impermeable (Roof) Surface Detain/Retain Stormwater Greywater Reuse for irrigation or park water features Low Water Demand Planting/Vegetation
  8. 8. WATER JET PICNIC GROUNDCOVER AMPHITHEATER FOUNTAIN MEADOW PLAZA MOUND GROUNDCOVER PLAY PLAY MOUND GARDEN GARDEN
  9. 9. GRAY WATER TREATMENT ZONES
  10. 10. MAIN WETLAND GARDEN PATH OVERLOOK PATH WETLAND PATH AT SUBSURFACE AROUND AROUND GARDEN GREYWATER OVERLOOK OVERLOOK TREATMENT AREA
  11. 11. Transbay Goals: Water Minimum goal: Meet LEED credits for stormwater and water efficiency Aspirational goal: Reduce use of potable water where non-potable water can be used. Current status: On track to exceed minimum goal.
  12. 12. Water System Design
  13. 13. Water System Design
  14. 14. Water System Design
  15. 15. Water Benchmarking
  16. 16. Water Use Summary Base Case Design Case Reduction [gallons per year] [gallons per year] [%] Potable Water Use 21,179,000 8,224,000 62% Irrigation water use 3,389,000 1,694,000 50% Domestic water use 11,658,000 7,988,000 31% Cooling tower water use without geothermal - 594,000 - Cooling tower water use with geothermal - 237,800 - Stormwater runoff to CSO 2,929,000 343,000 88% Sewage to CSO 17,790,000 8,288,000 53% Total volume to CSO 20,719,000 8,631,000 58% annual water savings of 8,224,000 gallons = 100 typical U.S. houses
  17. 17. Water Cost Savings Annual Cost of Annual Cost of Annual Potable Potable Water @ Annual Sewer Sewer Discharge Total Annual Total Annual Scenario Water Use $5.40/100 cu. ft. Discharge @ $9.66/cu. ft. Cost Cost Savings [gallons per year] [$ per year] [gallons per year] [$ per year] [$ per year] [$ per year] Design 1 21,179,215 $152,898 17,789,765 $268,451 $421,349 - Design 2 11,3001,97 $81,579 9,557,762 $151,687 $233,266 $188,000 Design 3 10,943,565 $79,004 9,201,130 $147,066 $226,070 $195,000 Design 4 10,387,458 $74,990 8,645,023 $139,861 $214,850 $206,000 Design 5 8,224,329 $59,373 8,288,391 $111,834 $171,207 $250,000 Design Scenario 1 - LEED base case Design Scenario 2 - Water conserving fixtures, native vegetation and efficient irrigation Design Scenario 3 - Hybrid geothermal system Design Scenario 4 - Graywater Reuse Design Scenario 5 - Stormwater reuse—current tank size. Current scheme. All water rates come from the San Francisco Public Utilities Commission website. Additional monthly fees not included in this summary are as follows: suspended solids discharge fee, oil/grease fee, chemical oxygen demand discharge fee and monthly service charge based on meter size.
  18. 18. Transbay Terminal Performance Indicators • First living roof to utilize a constructed wetland for treating greywater – 900,000 gallons annually • Integrated biological, plumbing, and mechanical systems – Stacking functions • Reduces sewage/stormwater discharge to City system – 2.7m gallons annually • Educational and interpretive value – 94,000 visitors daily
  19. 19. Transbay Terminal Policy Achievements • Overcoming ambiguous and outdated city/state policy – City: Ch. 16 (MOU for stormwater) – State: Appendix G, Title 24 (Commercial greywater) • Stormwater MOU: PUC / Building Inspectors / Health Dept. – All 3 entities met and solidified stormwater standards – Can this happen for greywater? • Variance Permit – Re-use of water to flush toilets - not currently part of code • Precedent for future water re-use inside commercial buildings – Sets the standard – Scale and visibility of project • What’s Needed: – No Water Quality Re-Use Standards currently exist – Comprehensive Greywater Re-Use Code in addition to landscape irrigation
  20. 20. Transbay Terminal Return on Investment • 25 year R.O.I. (conservative) • Up front costs of $1.2 - 1.6M • Saving $60K per year Assumptions: • Potable water prices will increase 60% in 5 years – Used this 5th year price for projections • Savings compared to an efficiently designed system
  21. 21. Implications for Silicon Valley
  22. 22. Casa Feliz SAN JOSE Return on Investment • San Jose’s first Living Roof • LEED Gold certification • Avoided $300K Stormwater fee utilizing Living Roofs
  23. 23. Implications for Silicon Valley • Cost savings for: – City of San Jose: Infrastructure & Energy – Developers: ROI, Avoiding Fees & Marketability • Now is the time – Water prices increasing and availability decreasing – Outdated infrastructure requiring considerable investment in near future • Adjust the mindset that sustainability has immediate pay-backs – Cost / Benefit ratios have leveled • Benefits of decentralized systems vs. massive infrastructure and treatment upgrades
  24. 24. MORE INFORMATION Transbay Joint Power Authority www.transbaycenter.org PWP Landscape Architecture www.pwpla.com Atelier Ten Environmental Design www.atelierten.com Consultants Rana Creek www.ranacreek.com SF PUC Stormwater Design Guidelines www.sfwater.org Upload this presentation from www.linkedin.com/in/jennyhenry Jenny Henry’s LinkedIn profile

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