Pilot Project Report

In December 1999 as part of the Regional Wastewater Services Plan (RWSP), the King County Council approved the development of a Regional Infiltration and Inflow (I/I) Control Program. The purposes of the program are to reduce the risk of sanitary sewer overflows and the cost of adding capacity to facilities that convey wastewater to County treatment plants.

In 2000, the County's Wastewater Treatment Division, in cooperation with the local component agencies that it serves, launched an ambitious six-year $41-million I/I control study. Completion of ten pilot projects in January 2004 marks a major milestone in the study. These projects tested the effectiveness of various sewer rehabilitation technologies in reducing I/I in local agency collection systems. The projects demonstrated that I/I can be effectively reduced, depending on the location and method of rehabilitation. In 2005, the County will use the results of the pilot projects, along with other information, to prepare a long-term regional plan for reducing I/I in local agency systems.

What's in the Pilot Project Report?

The Executive Summary of the Pilot Project Report, Regional Infiltration and Inflow Control Program, King County, Washington gives an overview of the I/I control program and the experiences gained from the pilot projects. The rest of the report provides detailed information on project selection, design, construction, costs, and results. The information in the report is technical. Its purpose is not only to record what was done but also to serve as the basis for additional studies on the costs and benefits of I/I control measures.

For more information, please contact Erica Jacobs at (206) 684-1138 or Erica.Jacobs@kingcounty.gov.

Table of Contents

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Executive Summary, issued October 2004 (895 KB)

Report, issued October 2004 (10.4 MB)

Title Page, Acknowledgements
Contents
Acronyms and Abbreviations
Chapter 1. Executive Summary (283 KB)
Chapter 2. I/I Pilot Project Selection (267 KB)
Chapter 3. Pilot Project SSES
Chapter 4. Rehabilitation Technology
Chapter 5. Pilot Project Design (277 KB)
Figures 5-2 to 5-25 (5.5 MB)
Chapter 6. Bidding and Administration
Chapter 7. Construction (335 KB)
Figures 7-1 to 7-55 (3 MB)
Chapter 8. Rehabilitation Effectiveness (401 KB)
Chapter 9. I/I Rehabilitation Project Costs and Lessons Learned
Glossary

Appendices, issued October 2004 (21.4 MB)

Title Page, list of Appendices 
Appendix A - I/I Pilot Project Candidate Nomination Forms (619 KB)
Appendix B - I/I Ronald Pilot Project Report (444 KB)
Appendix C - I/I Pilot Project Bid Tabulations (234 KB)
Appendix D - I/I Pilot Project Flow Monitoring (6 MB)
Appendix E - I/I Pilot Project Rainfall Monitoring (758 KB)
Appendix F - I/I Pilot Project Model Calibration (13.4MB)

Warranty Inspection, August 2006 --
Supplement to the Pilot Project Report