Post Point WWTP – Improvements Required To Address The Aging Solids Stream Train Solids Stream Train incinerator (#1) built in 1972 Liquids Stream Train recently upgraded (2014) Opportunity for resource recovery Liquids just upgraded, but solids stream untouched as part of project. Because of aging, the incinerators need to be replaced. City taking the opportunity to look at replacement options beyond “in kind” and ones that offer resource recovery opportunity, which is in keeping with City environmental ethic.

A Prime Opportunity Recover Resources at Post Point As a result of regulation (CWA) around sending raw sewage straight to water bodies, wastewater treatment required and a decision needed as to what to do with it – recycle as biosolids, incinerate, or landfill it. Brown and Caldwell

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

Step 1 – Resulted in Four Short-listed Conceptual Alternatives that are Digestion-Based Digestion System Location (Biosolids Class) Post Digestion Location (Product Biosolids Class) Beneficial End Use Alternative 1 Post Point (Class B) NA Class B Land Application at permitted sites Alternative 2 Dryer at Post Point (Class A) Class A Dried Fertilizer Product Alternative 3 Post Point (Class A) Soil Blending Off-site (Class A) Class A Manufactured Topsoil Alternative 4 Off-site (Class A) Brown and Caldwell

Step 2 – Comparison of Preliminary TBL+ Results Technical Technical Technical Technical Technical Technical Financial Financial Financial Financial Financial Compatibility with Criteria Social Social Social Social Social Environmental Environmental Environmental Environmental Environmental 0% Ideal Post Point Class B Post Point Class A Dried Post Point Class A Soil Off-site Class A Soil

Step 2 – Comparison of Preliminary TBL+ Results 100% Technical Technical Technical 75% Financial Technical Financial Technical Financial Financial Compatibility with Criteria 50% Financial Social Social Social Social Social 25% Environmental Environmental Environmental Environmental Environmental 0% Ideal Post Point Class B Post Point Class A Dried Post Point Class A Soil Off-site Class A Soil

The Project Team Visited Area Class A Biosolids Programs with Local Distribution of Product “Sumner Grow” (City of Sumner) “Tagro” (City of Tacoma) Brown and Caldwell

Public Outreach Program Continues to Inform the Process May 23, 2017 – Community Workshop General support for moving away from incineration FAQs and responses now posted on City’s biosolids website July 31, 2017 – Follow-up Community Workshop Scheduled Update on project status Overview of preliminary TBL+ results