City of Bellingham Biosolids Planning Core Team Meeting

City of Bellingham Biosolids Planning – Core Team Meeting 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 Giesbrecht 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) • • 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: Giesbrecht Status update of field investigations work Overview of next steps and how information will be used Next Steps Brown and Caldwell 2

Brown and Caldwell 3

Overview of changes to Pass/Fail Brown and Caldwell 4

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell 5

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell 6

Pass/Fail Criteria Updates From Last Workshop Brown and Caldwell 7

Conceptual Alternatives – focus now on postdigestion options and end use Brown and Caldwell 8

TBL+ Criteria Revised Financial criteria TBL+ process Brown and Caldwell 9

Updated Financial Criteria Parameter Examples of Metric F 1. Optimizes system value Provides balanced ROI using Compare the life-cycle cost TBL+ criteria over 50 year life 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) F 2. Affordability Consistent with long term Illustrate how the ability to financial, environmental and achieve desired social goals of Wastewater environmental and social utility benefits is linked to the anticipated rate impacts for each alternative F 3. Minimizes risk of end use Limits risk or maximizes market sensitivity benefits from commodity market changes of end use products Brown and Caldwell 10

TBL+ Comparison of Alternatives 8 E 2 Global Impact Number of Objectives Met 7 E 1 Local Impact 6 5 4 3 2 1 0 S 2 E 2 Assets Global Impact S 1 Health & Safety F 2 E 2 Life Cycle $ Global Impact F 1 E 1 Capital $ Local Impact T 2 S 2 Efficiency Assets T 1 Reliability/ Performance Ideal Alternative T 1 Reliability/ Performance Alt. 1 S 1 T 1 Health & Safety Reliability/ Performance Alt. 3 Alt. 4

Key Differentiators Identified in Detailed Analyses

Design Year Flows/Loads Basis Brown and Caldwell 13

Current Population Projection Range 160, 000 140, 000 Land Capacity Analysis Population (persons) 120, 000 100, 000 80, 000 60, 000 Historic City + UGA 2016 Comprehensive Plan Resolution 2015 -14 Low Resolution 2015 -14 Medium Resolution 2015 -14 High LCA = assuming Buildout ? 40, 000 20, 000 0 1996 2001 2006 2011 2016 2021 2026 2031 2036 2041 2046

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 45, 000 Maximum Month BOD Load, ppd 40, 000 Permit Capacity Land Capacity Analysis 35, 000 30, 000 25, 000 20, 000 15, 000 10, 000 2009 Comprehensive Sewer Plan Liquid Stream Facilities Plan - Resolution 2009 -10 2016 Comprehensive Plan 5, 000 0 1996 2001 2006 2011 2016 2021 2026 2031 2036 2041 2046

Preliminary Influent TSS Projection 50, 000 Land Capacity Analysis Maximum Month TSS Load, ppd Permit Capacity 40, 000 30, 000 2009 Comprehensive Sewer Plan Liquid Stream Facilities Plan - Resolution 2009 -10 2016 Comprehensive Plan 10, 000 0 1996 2001 2006 2011 2016 2021 2026 2031 2036 2041 2046

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 3, 000 Incinerator Loading Peak 3 D, lb/hr 2, 500 Begin 24/7 operation Combined incinerator capacity Land Capacity Analysis 2, 000 1, 500 1, 000 Measured P 3 D Data Projection Based on Population Growth (base 2016) Projection based on population (base 2012) CDM Projection 500 0 1996 2001 2006 2011 2016 2021 2026 2031 2036 2041 2046

Proposed Layout/Design Criteria Brown and Caldwell 21

General Redundancy Criteria Mechanical Equipment Ø One redundant unit above peak loading condition (thickening, dewatering, process pumps, compressors, gas flares, etc. ) Process Units Ø No redundant unit – size based on service condition of one unit off line during max month condition (digesters) Ø No redundant unit – size based on 2 units at 60% peak day load each (driers) Ø No redundant unit – size based on optimized capacity (cogeneration, gas upgrading where flare backup is available) Brown and Caldwell 22

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 Sized for peak day load with one unit out of service 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 23

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 2 x safety factor

Offsite Assessment Brown and Caldwell 25

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 Brown and Caldwell • Disadvantages • Land purchase • Permitting • Conveyance from Post Point • Operations staff at 2 locations 26

Documentation Goals Brown and Caldwell 27

Who’s the Audience? Brown and Caldwell 28

Public Outreach Brown and Caldwell 29

April 10 th Council Meeting • Overview of TBL+ criteria proposed for assessing alternatives • Demonstrate link to City Legacy Statements and Strategic Commitments Brown and Caldwell 30