Biosolids Planning – Core Team Meeting City of Bellingham April 3, 2017

Agenda Topic Description Leader Introductions (5 mins) Review agenda and meeting objectives Status update Get input and confirmation on recommendations Identify areas that need additional follow-up Giesbrecht Schedule Overview (5 mins) Overview of schedule and work sequence status Preliminary BCE (30 mins) Overview of alternatives Inputs and assumptions Benefits and risks Discussion: Confirm what’s needed for getting to a decision. Stephens Infiltration (20 mins) Status update of field investigations work Overview of next steps and how information will be used Turk WWTP Impacts (20 mins) Overview of disinfection/treatment considerations Overview of site layout considerations Discussion: Confirm recommendations Tam or Stephens? Bureau of Reclamation Site Visit (3/13) Prep (10 mins) Discuss materials needed and logistics for the site visit. Zaroff Stakeholder Meeting (6/7) (15 mins) Confirm purpose and messaging: Next Steps Brown and Caldwell

Brown and Caldwell

Overview of changes to Pass/Fail Brown and Caldwell

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell

Conceptual Alternatives – focus now on post-digestion options and end use Brown and Caldwell

Revised Financial criteria TBL+ process TBL+ Criteria Revised Financial criteria TBL+ process Brown and Caldwell

Updated Financial Criteria Parameter Examples of Metric F1. Optimizes system value Provides balanced ROI using TBL+ criteria over 50 year life Compare the life-cycle cost of alternatives (e.g., cost of construction, land, mitigation, ongoing O&M expenses) with the monetized value of key benefits (e.g., reduced carbon emissions, soil tilth) F2. Affordability Consistent with long term financial, environmental and social goals of Wastewater utility   Illustrate how the ability to achieve desired environmental and social benefits is linked to the anticipated rate impacts for each alternative F3. Minimizes risk of end use market sensitivity Limits risk or maximizes benefits from commodity market changes of end use products Brown and Caldwell

TBL+ Comparison of Alternatives 8 E2 Global Impact 7 E1 Local Impact 6 S2 Assets E2 Global Impact 5 S1 Health & Safety S1 Health & Safety Number of Objectives Met 4 F2 Life Cycle $ F2 Life Cycle $ E2 Global Impact 3 F1 Capital $ F1 Capital $ E1 Local Impact E1 Local Impact E1 Local Impact 2 T2 Efficiency T2 Efficiency S2 Assets S2 Assets S2 Assets 1 T1 Reliability/ Performance T1 Reliability/ Performance S1 Health & Safety T1 Reliability/ Performance Ideal Alternative Alt. 1 Alt. 3 Alt. 4

Key Differentiators Identified in Detailed Analyses

Design Year Flows/Loads Basis Brown and Caldwell

Current Population Projection Range

Key Load Projection Assumptions Land capacity analysis (LCA) represents land use buildout of City and UGA. Changes to zoning would be required to continue growth Industrial loading (SIUs) is approximately 10% of total BOD/TSS load. Industrial load will increase based on employment growth through 2036 City/UGA will be 100% sewered by 2036 LWWSD growth projection consistent with 2009 Comprehensive Sewer Plan Per capita loads 0.20 ppcd BOD, 0.24 ppcd TSS

Preliminary Influent BOD Projection Land Capacity Analysis

Preliminary Influent TSS Projection Land Capacity Analysis

Confirmation of Key Assumptions to finalize flows and loads Land capacity analysis (LCA) represents current land use of City and UGA. Zoning would change to continue same rate growth beyond 2036 Industrial loading (SIUs) is approximately 10% of total BOD/TSS load. Industrial load will increase based on employment growth through 2036 (7%) City/UGA will be 100% sewered by 2036 Linear LWWSD growth projection consistent with 2009 Comprehensive Sewer Plan North Shore (+100 households by 2026) South Shore (+1650 households by 2026)

Team Discussion What is design year/load for Biosolids planning?

Incinerator Capacity Preliminary Peak 3-Day Loading Projection Begin 24/7 operation Combined incinerator capacity Land Capacity Analysis

Proposed Layout/Design Criteria Brown and Caldwell

General Redundancy Criteria Mechanical Equipment One redundant unit above peak loading condition (thickening, dewatering, process pumps, compressors, gas flares, etc.) Process Units No redundant unit – size based on service condition of one unit off line during max month condition (digesters) No redundant unit – size based on 2 units at 60% peak day load each (driers) No redundant unit – size based on optimized capacity (cogeneration, gas upgrading where flare backup is available) Brown and Caldwell

Solids Sizing Criteria Process Sizing Criteria Thickening Assume reusing existing GBTs and co-thickening Sized for peak day load with one unit out of service Digestion Assume TPAD for Class A option (including batch tanks) 4 digesters sized for: - Peak 2-week with all tanks available - Peak month with one tank out of service Digested Sludge Storage One tank sized for 1 day of storage (at peak day), assuming 24/7 operation of dewatering process Dewatering Assume reusing existing centrifuges Cake Storage Sized based on end use (land application = 3 days, dried product = 1 day, soil blending = 0-1 day depending on location of digestion) Dryer Assume 2 dryers, each sized for 60% of peak day load Product storage Storage for 120 days of product (except land application which is covered by cake storage above) Brown and Caldwell

Biogas Sizing Criteria Process Sizing Criteria Boilers 2 boilers sized to handle 60-100% of peak 2-week load Redundant unit or cogeneration serves as redundancy Redundant pump (peak day) for main heat loop CHP Engines 1 or 2 engines sized to handle max month No redundant unit Biogas Upgrading Sized for peak 2-week No redundant units Flares 2 flares sized to handle 50%+ each with 2x safety factor

Offsite Assessment Brown and Caldwell

Off-site Considerations Advantages Easier implementation of co-digestion Reduces trucking and neighborhood impacts to Fairhaven Economy of scale/regional option Could preserve future capacity for Post Point Liquids treatment Could open door to privatization options Disadvantages Land purchase Permitting Conveyance from Post Point Operations staff at 2 locations Brown and Caldwell

Documentation Goals Brown and Caldwell

Who’s the Audience? Brown and Caldwell

Public Outreach Brown and Caldwell

April 10th Council Meeting Overview of TBL+ criteria proposed for assessing alternatives Demonstrate link to City Legacy Statements and Strategic Commitments Brown and Caldwell

April 19th MNAC – Draft Fact Sheet Brown and Caldwell

Status on other Public Outreach Activities Official project name Website Other? Brown and Caldwell

Next Steps Action Items Site visits? TBL+ development Tacoma CTP (Digesters and TAGRO) CCWWTP (Digester and Dryer) TBL+ development Brown and Caldwell