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Aaron Toneys Good Company Eugene, OR

Carbon Footprinting Construction Projects 2015 Geo-Environmental Conference Eugene, OR April 21, 2015. Aaron Toneys Good Company Eugene, OR. session overview. introduction to Good Company GHG inventory 101 significance of construction and maintenance carbon footprinting case studies

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Aaron Toneys Good Company Eugene, OR

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  1. Carbon Footprinting Construction Projects2015 Geo-Environmental ConferenceEugene, ORApril 21, 2015 Aaron Toneys Good Company Eugene, OR

  2. session overview • introduction to Good Company • GHG inventory 101 • significance of construction and maintenance • carbon footprinting case studies • highlight materials vs. fuel emissions • emissions reduction opportunities • Q & A

  3. Good Company • sustainability research and consulting firm • mission-driven, for-profit • clients: government, higher ed, private sector • Aaron: Environmental scientist. Process engineer.

  4. GHG inventory 101 What do you measure? • measuring the weight of greenhouse gases • Kyoto gases and Global Warming Potential (GWP) • convert all gases into metric tons of carbon dioxide equivalent (MT CO2e) using GWP

  5. GHG inventory 101 What is one MT CO2e? • One (1) MT CO2e is equal to any one of the following: • 112 gallons of gasoline • one passenger vehicle driven 2,688 miles • 5% of the energy use in one home for a year

  6. GHG inventory 101 GHG Scope Accounting Categories

  7. Significance of Construction operational GHG inventory emissions Source: Good Company on behalf of Alameda County, CA (2015). Meta-Analysis of Operational GHG Inventories.

  8. Significance of Construction supply chain GHG emissions, by org. type

  9. Significance of Construction supply chain GHG emissions, by population

  10. Significance of Construction supply chain GHG emissions, by revenue

  11. Case Study 1: N. Vancouver Bridge North Vancouver Ave. Bridge

  12. North Vancouver Bridge Replacement lifecycle emissions, by stage and source

  13. North Vancouver Bridge Replacement gross emissions 60% 23%

  14. North Vancouver Bridge Replacement construction material emissions breakdown

  15. North Vancouver Bridge Replacement fuel emissions breakdown

  16. Case Study 2: Sellwood Bridge Sellwood Bridge

  17. Sellwood Bridge

  18. Sellwood Bridge Replacement GHGs by construction element and source 30,576 MT CO2e Materials = 88% Fuel = 12%

  19. Sellwood Bridge Replacement construction material emissions by material

  20. Case Study 3: Solar Power Facility Solar Highway: West Linn Facility

  21. West Linn Solar Power Facility overview

  22. West Linn Solar Power Facility gross project emissions sources 90% 5%

  23. West Linn Solar Power Facility gross project emissions sources

  24. West Linn Solar Power Facility carbon implications of tree removal 2%

  25. Case Study 4: Dam Improvements Carmen Smith, Smith River and Trailbridge

  26. Carmen Smith overview 27,368 MT CO2e (not including stored-C in trees) 73% 20 acres of Douglas fir forest removed 22%

  27. Carmen Smith material emissions Gross Emissions: 19,938 MT CO2e

  28. Case Study Summary case studies: lessons learned • Material emissions are a big part of the story • Concrete • Steel / other metals • Asphalt • Aggregate • 60 - 90% of gross project emissions were from the production of the construction materials (and services).  • Fuel use makes up 5 - 23% of gross emissions. • Vegetation removal generally isn’t a major factor, unless you are clearing woods / large trees and not mitigating

  29. Project GHG Reduction Opportunities opportunities at N. Vancouver Bridge

  30. Concrete GHG Reduction Measures concrete GHG measures vs. Baseline Baseline = 1 short ton of 3,600 psi concrete

  31. Asphalt GHG Reduction Measures asphalt GHG measures vs. Baseline Baseline = 1 short ton of HMAC with 5% binder

  32. Fuel Reduction Measures mitigation opportunity: biodiesel

  33. Carmen Smith mitigation opportunity: biodiesel • Emissions / savings for 250,000 gallons vs. ULS diesel 17% reduction 82% reduction

  34. Reducing Emissions Summary emissions reduction take aways

  35. Reducing Emissions Summary example project: Willamette Bridge • 60% slag concrete mix • 30% crushed concrete as aggregate used in some mixes For more visit http://www.obec.com/News/PDF/knife-river-feb2014.pdf

  36. Related Resources carbon footprinting construction resources

  37. Thank You! and Q&A • Feel free to contact me: • Aaron Toneys • aaron.toneys@goodcompany.com • (541) 341-GOOD (4663), ext. 218

  38. GHG inventory 101 climate change: the significance of acting now Current Source: Hansen, et. al. (2012). Scientific Case for Avoiding Dangerous Climate Change.

  39. West Linn Solar Power Facility emissions reductions

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