Brightwater Project - outfall pipe under tow; conveyance tunnel and treatment plant under construction Regional Carnation Treatment Plant Wastewater Services Plan Hidden Lake Sewer Improvement Project - odor control stack disguised as a tree snag in Boeing 2008 Annual Report Creek Park September 2009 Juanita Bay Pump Station Regional Wastewater Services Plan (RWSP) RWSP 2008 Annual Report September 2009 King Street Center, KSC-NR-0512 201 South Jackson Street Seattle, WA 98104 http://www.kingcounty.gov/wtd/ For comments or questions, contact: Debra Ross King County Wastewater Treatment Division 201 South Jackson Street KSC-NR-0512 Seattle, WA 98104-3856 206-684-1531 [email protected] This information is available in alternative formats on request at 206-684-1280 (voice) or 711 (TTY). Table of Contents Acronyms and Abbreviations ...................................................................................... v Executive Summary ................................................................................................ ES-1 Providing Needed Capacity in the Regional System ................................................................. ES-1 Brightwater Treatment System........................................................................................ ES-1 Conveyance System Improvements ................................................................................ ES-2 Creating Resources from Wastewater........................................................................................ ES-3 Biosolids Recycling......................................................................................................... ES-3 Reclaimed Water ............................................................................................................. ES-4 Energy Generation from Digester Gas ............................................................................ ES-5 Protecting Water Quality and Complying with Regulations...................................................... ES-5 Treatment Plants.............................................................................................................. ES-6 CSO Control and Sediment Management ....................................................................... ES-6 Source Control................................................................................................................. ES-7 Endangered Species Act Compliance.............................................................................. ES-7 Being a Good Neighbor ............................................................................................................. ES-8 Odor Control.................................................................................................................... ES-8 Public Involvement.......................................................................................................... ES-9 Tracking Costs ........................................................................................................................... ES-9 Chapter 1 Introduction ............................................................................................. 1-1 1.1 King County’s Wastewater Treatment System...................................................................1-2 1.2 Regional Wastewater Services Plan....................................................................................1-4 Chapter 2 Brightwater Treatment System .............................................................. 2-1 2.1 Brightwater System Construction .......................................................................................2-2 2.1.1 Treatment Plant Construction................................................................................2-2 2.1.2 Conveyance System Construction.........................................................................2-3 2.2 Mitigation Activities ...........................................................................................................2-6 2.3 Public Involvement Activities.............................................................................................2-7 2.4 Schedule for 2009 ...............................................................................................................2-8 Chapter 3 Conveyance System Improvements ...................................................... 3-1 3.1 Amendments to RWSP Conveyance Policies.....................................................................3-1 3.2 RWSP Projects in Design ...................................................................................................3-2 3.2.1 Kent/Auburn Conveyance System Improvements ................................................3-2 3.2.2 Black Diamond Infrastructure Upgrade ................................................................3-4 3.3 RWSP Projects in Construction ..........................................................................................3-5 3.3.1 Hidden Lake Pump Station Replacement and Sewer Improvement......................3-5 3.3.2 Juanita Bay Pump Station Replacement................................................................3-6 3.3.3 North Creek Interceptor.........................................................................................3-6 3.3.4 Bellevue Pump Station Upgrade ...........................................................................3-6 3.4 Schedule for 2009 ...............................................................................................................3-7 Chapter 4 Infiltration and Inflow Control ................................................................ 4-1 4.1 Initial I/I Reduction Project Progress..................................................................................4-2 4.1.1 Combined Bellevue and Issaquah Initial I/I Reduction Project.............................4-3 RWSP 2008 Annual Report i Table of Contents 4.1.2 Skyway Initial I/I Reduction Project .....................................................................4-4 4.2 Initial I/I Reduction Projects Schedule ...............................................................................4-5 Chapter 5 Combined Sewer Overflow Control ....................................................... 5-1 5.1 CSO Control Activities in 2008..........................................................................................5-1 5.1.1 Mercer/Elliott West CSO Control System ............................................................5-2 5.1.2 Henderson/Norfolk CSO Control System .............................................................5-2 5.1.3 2008 CSO Control Plan Update and 2011 CSO Program Review ........................5-2 5.1.4 Puget Sound Beach Projects..................................................................................5-4 5.1.5 Ballard Siphon Replacement Project and CSO Control ........................................5-5 5.1.6 CSO Treatment Technology Pilot Program...........................................................5-5 5.1.7 Evaluation of Green Stormwater Infrastructure ....................................................5-6 5.1.8 Coordination with the City of Seattle....................................................................5-7 5.1.9 Program Audit .......................................................................................................5-7 5.2 Sediment Management Activities in 2008 ..........................................................................5-7 5.2.1 Sediment Management Plan..................................................................................5-8 5.2.2 Harbor Island Superfund Site ................................................................................5-9 5.2.3 Lower Duwamish Waterway Superfund Site ......................................................5-10 Chapter 6 Odor Control Program ............................................................................ 6-1 6.1 Phased Retrofit of the West Point and South Plants ...........................................................6-1 6.2 Conveyance System Upgrades............................................................................................6-2 6.3 Brightwater Odor Control System ......................................................................................6-3 Chapter 7 Biosolids Recycling and Energy Recovery........................................... 7-1 7.1 Production and Use of Biosolids in 2008............................................................................7-2 7.2 Research Studies .................................................................................................................7-3 7.3 West Point Treatment Plant Digestion System Improvements ...........................................7-3 7.4 West Point Treatment Plant Influent Screening Improvements..........................................7-3 7.5 Transition to International Organization for Standardization 14001 ..................................7-4 7.6 Request for Information......................................................................................................7-5 7.7 Budget Proviso....................................................................................................................7-5 7.8 Producing Energy from Methane........................................................................................7-5 7.8.1 Energy Recovery at South Treatment Plant ..........................................................7-5 7.8.2 Energy Recovery at West Point Treatment Plant ..................................................7-6