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The Truth about Ecological Revitalization - Case Studies and Tools to Improve your Cleanups

The Truth about Ecological Revitalization - Case Studies and Tools to Improve your Cleanups. Carbon Sequestration and Life Cycle Analysis. Sally Brown, University of Washington. Carbon Sequestration and Life Cycle Analysis. Andrew Trlica and Sally Brown University of Washington.

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The Truth about Ecological Revitalization - Case Studies and Tools to Improve your Cleanups

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  1. The Truth about Ecological Revitalization - Case Studies and Tools to Improve your Cleanups Carbon Sequestration and Life Cycle Analysis Sally Brown, University of Washington

  2. Carbon Sequestration and Life Cycle Analysis Andrew Trlica and Sally Brown University of Washington

  3. Restoration Sites • No soil or highly contaminated soil • Disruption of process of carbon accumulation/cycling

  4. How you restore • Use of organic amendments • Will accelerate process • But are changes in soil carbon persistent?

  5. Soil Carbon: Restoration Andrew Trlica Funded by Environmental Credit Corp, Jim Ellis, King County

  6. Coal Mine, WashingtonRestored in the 1980s

  7. Centralia, WashingtonCoal Mine Restoration • 52 Mg of C per hectare above conventional • 0.25 Mg C per Mg biosolids

  8. Highland Valley Copper, British Columbia6 – 8 years old

  9. Highland Valley Copper, British ColumbiaCoal Mine Restoration • 40 Mg of C per hectare • 0.3 Mg C per Mg amendment

  10. Pennsylvania Coal Mines – Control NPK applied, 20 years ago

  11. Pennsylvania Coal Mines – Biosolids 128 Mg ha applied, 27 years ago

  12. Pennsylvania – Historic Site

  13. That means… • 190 Mg of CO2 per hectare • 0.9 Mg CO2 per Mg biosolids

  14. RMI Topsoils, New HampshireGravel pit restoration - 5 years old • 87 Mg of C per hectare • 0.15 Mg C per Mg amendment

  15. Three separate sitesData consistent across sites                 

  16. Biosolids- carbon credits for more than just soil C accumulation

  17. CCX Draft protocol CH4 avoidance to compost facilities Total = 1.12 Mg CO2

  18. Nutrient Value- 318 kg CO2 per dry Mg

  19. GHG balance for a biosolids program

  20. GHG balance for a hectare of land?

  21. LCA for 1 ha in Pacific Northwest • Compared • Conventional restoration • Restoration with organics (biosolids) • Low density development • Used data on soil carbon from our sampling • Biosolids sent to dryland wheat as alternative

  22. Housing • 1,000 people per km2 • Structure size 2,521 ft2 • 3.86 homes per ha • Road 0.43 ha/ha • Open space 0.47 ha

  23. LCA Results • Home and road construction and maintenance emissions dwarf biosolids tranpsort emissions

  24. Transport • Under our baseline modeling assumptions the haul distance would need to be greater than 30 times the baseline assumption to eliminate the net sink effect in the whole conventional reclamation scenario

  25. Sequestration • Sequestration potential is greatest with biosolids restoration • Due to increased • SOM • Tree biomass

  26. Final Results

  27. Additional Considerations • Rain and runoff • 1 ha over 30 year period 646 ML of water • 53% impervious cover • 30% of rainfall = surface discharge • 194 ML of water will require treatment

  28. Additional Considerations • Recreation • 2009 tourism =$14.2 billion • 37% camped, hiked or backpacked • Assume 1% of tourism $$ result of access to outdoor activities • 354 k ha forested land in King County • Over 30 year period, each ha =$31,000

  29. Conclusions • Using broader perspective further confirms benefits of restoration • Organics in restoration makes benefits one better

  30. Sally Brown University of Washington Phone: (206) 616-1299 Email: slb@u.washington.edu

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