City of Tigard’s Drinking Water Supply

1. City of Tigard’s Drinking Water Supply August 2005 Presented by: Dennis Koellermeier, Public Works Manager

2. “Equity Position in a Water Source by 2007” City of Tigard Vision Task Force

3. Presentation Overview • System Overview • Water Purchase Options • Brief Historical Overview • Water Demand Projections • Long-term Supply Options • Cost Review • Evaluation Criteria

4. Tigard Water System Overview • Distribution System Improvements • ASR Development Projects • Long-term Water Supply Options

5. FY 05/06 Water Purchase Options

6. Bridgeport Connection Bradley Corner Capacity Increase Willamette River Supply Preliminary Engineering Report Water Supply Plan ASR No. 2 Operational City Begins Discussions with JWC Begin Negotiations with Lake Oswego City Residents Approve Requiring Public Vote for Use of Willamette Source ASR No. 1 Operational Baylor Street Connection Tigard Joins JWC 1990 1994 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 Beaverton Intertie City Renews Discussions with Lake Oswego Water Supply Plan Update Tigard Joins Local Providers Evaluating a Willamette River Supply Implementation Plan for the Formation of a Proposed Bull Run Regional Drinking Water Agency Phase I Regional Water Supply Plan Bull Run Regionalization Talks End & Portland Continues Contract Negotiations with Wholesalers Negotiations with Lake Oswego End City Joins Clackamas River Water Supply Consortium Discussions with Clackamas Supply Consortium End Water supply studies Capacity increase through new or existing interties and ASR capacity increases Water supply negotiations or group formation Other events City of Tigard Supply Source Development 15- Year Time-line

7. Perspective Overview – City of Portland City of Tigard – Long-term Water Supply Overview May 2005

8. City of Portland Supply • Supply Connections • Bradley Corner – City of Portland • Baylor Street Reservoirs – Tualatin Valley Water District • Current Status • Current Agreement for Supply Expires June 2005 • Key Issues • Costs • Capital and Cost of Water • Not SDC Eligible • Condition of Agreement • Outlook for City Ownership

9. Perspective Overview – Clackamas River Supply City of Tigard – Long-term Water Supply Overview May 2005

10. Clackamas River Supply • Supply Connections • Bonita Road Pump Station – City of Lake Oswego • Current Status • Current Agreement for Supply • Key issues • Advancing Beyond Preliminary Discussions • Conditions of Agreement • Cost • Outlook for City Ownership • Water Rights and Water Availability

11. Perspective Overview – Joint Water Commission Facilities City of Tigard – Long-term Water Supply Overview May 2005

12. Joint Water Commission • Supply Connections • City of Beaverton Intertie • Current status • Current Agreement for Supply • Key Issues • Cost • System Reliability • Schedule • Conditions of Agreement • Outlook for City Ownership

13. Perspective Overview – Willamette River Supply system City of Tigard – Long-term Water Supply Overview May 2005

14. Willamette River • Supply Connections • No Connection to Tigard’s System • Current Status • City of Wilsonville Supply since April 2002 • Original Construction included Oversized Facilities • Key Issues • Public Perception • Political Considerations • Public Vote Needed • Cost • Capital and Cost of Water • SDC Eligible • Raw Water Quality

15. Perspective Overview – Local ASR Users City of Tigard – Long-term Water Supply Overview May 2005

16. Local Groundwater and ASR • Existing City Wells • Groundwater Limited Area • No Potential for Expanded Local Supply • Aquifer Storage and Recovery (ASR) • City of Tigard • City of Beaverton • City of Tualatin • City of Portland

17. Tigard’s ASR System • Important Water Management Tool For The City • ASR Well No. 1 – 1.0 mgd Peak Day Production Capacity • ASR Well No. 2 • Estimated Peak Day Production Capacity – 2.5 mgd • Operational for the Summer 2006 Season • Additional ASR Wells • Exploratory Drilling for ASR No. 3 is Planned • May Add ASR No. 4 • Ultimate Estimated Local Capacity for ASR is 4 – 6 mgd

18. Relative Cost of Long-term Supply Options

19. $2.33 $2.50 $2.06 $1.80 $2.00 $1.31 $1.50 $1.00 $0.50 $0.00 City of Portland (Membrane Filtration) City of Portland (Ultra Violet Treatment) Joint Water Commission Willamette Treatment Plant Comparative Cost of Water ($/ccf) of Long-Term Supply Options

20. Source Evaluation Considerations • Previously used Criteria • Opportunities for City Ownership of Supply System • Water Supply Agreements & Contract Provisions • Required Improvements & Estimated Project Costs • Estimated Cost of Water • Water Rights • Water Quality • Supply Implementation Timing • Certainty of Supply

21. Potential Next Steps & Summary • Ongoing Participation in Portland Contract Negotiations • Consideration of Other Options • Clackamas River Supply • Joint Water Commission • Willamette River Supply • Gather Information and Generate Data on Options • Consider and Develop an Evaluation and Selection Criteria • Act to Advance or Discontinue Consideration of Option(s)