Resource Recovery at Post Point Turning our waste into valuable resources

1. Resource Recovery at Post Point Turning our waste into valuable resources July 31, 2017

2. AGENDA • Project Overview • Drivers • Resource Recovery • Summary of Community Feedback • Preliminary Evaluation (TBL+) Results • Outreach Goals and Wrap-up

3. PROJECT OVERVIEW

4. Post Point WWTP – Improvements Required To Address The Aging Solids Stream Process • Solids Stream Process incinerator (#1) built in 1972 • Liquids Stream Process recently upgraded (2014) • Opportunity for resource recovery

5. Solids Stream Project Drivers • The incinerators… • Are both past their design life • Are expensive to repair and maintain • Burn residual solids (resources) rather than recover them • Do not recover heat • Have limited capacity for long-term growth • Are subject to increasingly stringent air quality regulations Brown and Caldwell

6. Resource Recovery

7. A Prime Opportunity Recover Resources at Post Point Brown and Caldwell

8. Pass/Fail Criteria Resulted in Anaerobic Digestion Based Alternatives • Meets regulations • Proven process and allows for innovation • Reliable • Safe working environment • Meets Climate Action Plan (resource recovery) • Minimizes social impacts Solids Stabilization Process: Anaerobic digestion

9. How Are Biosolids and Biogas Produced? Schematic from Northwest Biosolids website at www.nwbiosolids.org Brown and Caldwell

10. What Are Biosolids? • “Soil like” - contains water, nutrients, organic matter, and microorganisms • Treatment of biosolids determines end use • Class A – Extremely low pathogen levels. Approved for home gardens, parks, etc. • Class B – 95% removal of pathogens. Approved for use on agronomic crops (i.e., wheat) Schematic from Northwest Biosolids website at www.nwbiosolids.org Brown and Caldwell

11. Beneficial Use of Biosolids Is a Well Established Practice That Has Numerous Benefits • Nutrients • Crop yields • Organic matter • Soil structure (tilth) • Water retention Brown and Caldwell

12. Beneficial End Use Biosolids Land Application Anaerobic Digester (King County Brightwater) Soil Amendment Brown and Caldwell

13. Biogas Use Biogas Cogeneration Anaerobic Digester (King County Brightwater) Pipeline Vehicle Fueling Station Brown and Caldwell

14. Proposed Location Of On-Site Improvements At Post Point Brown and Caldwell

15. Summary of Public Feedback Brown and Caldwell

16. May 2017 Community Workshop Feedback • General support for moving away from incineration • Interest in Class A, including local use • All TBL+ categories important • Numerous questions posed Brown and Caldwell

17. How Community’s Feedback Was Used Brown and Caldwell

18. Preliminary TBL+ Results Brown and Caldwell

19. Post Point Biosolids Alternatives Were Evaluated Using the TBL+ Framework 2-Step Process High level screening of potential alternatives 1 2 TBL+ evaluation of most feasible alternatives Brown and Caldwell

20. 1 Screening Resulted in Four Conceptual Alternatives that are Digestion-Based Brown and Caldwell

21. The Resource Recovery Project Will Be Guided By City’s Legacies and Strategic Commitments TBL+ Criteria • Environmental • Social • Financial • Technical Brown and Caldwell

22. 2 TBL+ Criteria Measure Desired Outcomes

23. 2 Comparison of Preliminary TBL+ Results

24. Highest Scoring Alternative 3 Aligns with City Values and Offers Significant Benefits Benefits • Best Environmental • “Competitive” in Social, Financial, and Technical/ Functional • Class A product available for local use • Diversified end use options with Class A Brown and Caldwell

25. Phase 2 Of Study Will Refine Alternative 3 • Type of anaerobic digestion system • Assess potential off-site locations • Biogas use • Local market use • Refine facility layouts • Further assess impacts and phasing • Use TBL+ framework Brown and Caldwell

26. OUTREACH GOALS AND WRAP UP Brown and Caldwell

27. Public Outreach Will Inform the Process Outreach Program Goals • Inform residents and stakeholders • Engage stakeholders to validatealignment with values • Link decisions to Legacies and Strategic Commitments • Create project ambassadors • Avoid surprises – frequent communication • Identify a community-supported project

28. Expected Project Schedule • 2017 • 2018-2020: Permitting and Design • 2021-2023: Construction Brown and Caldwell

29. How You Can Stay Involved • Share your feedback by Friday, August 11 - Complete tonight or mail back - Complete online • Join the project listserv • Visit the website Brown and Caldwell

30. Questions? Brown and Caldwell