1 / 20

Water Supply Update

Water Supply Update. Joint IWB & City Council Meeting. City of Tigard Public Works Department Water Division April 20, 2004. W ater S upply U pdate. Tonight’s summary will include information on: Current status of water supply options Pilot results of ASR Well No. 2

maeko
Télécharger la présentation

Water Supply Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Water Supply Update Joint IWB & City Council Meeting City of Tigard Public Works Department Water Division April 20, 2004

  2. Water Supply Update • Tonight’s summary will include information on: • Current status of water supply options • Pilot results of ASR Well No. 2 • Site recommendations for ASR Well No. 3 • Location of 550-foot zone Reservoir No. 2 • Fluoride update

  3. Seeking a Water Supply • Supply capable of meeting: • Current demands – 14 MGD (peak day) • Future demands – 19.37 MGD (peak in 2050) • Options under review: • Joint Water Commission • Portland Water Bureau • Willamette River Treatment Plant

  4. Joint Water Commission • Tigard has been granted partnership into JWC • A “leasing” partner • Does NOT give Tigard water rights • Does NOT give Tigard ownership in JWC

  5. JWC Leasing Agreement • Summer Leasing Program • May 1 thru October 31 • Use of stored raw water (not “river flow”) • Lease “unused” facility capacity to others • Stored Raw Water (Hagg Lake) • 1,730 acre-feet leased to Tigard (563.72 million gallons) • Water Treatment Plant Capacity • 4.0 million gallons per day leased to Tigard • Transmission Line Capacity • 4.0 million gallons per day leased to Tigard

  6. Tualatin River Water Supply Project • Phase 1 - Feasibility study • COMPLETED • Phase 2 - Permits & Environmental Assessment • Currently underway • Scheduled for completion in approximately one year • Evaluating project reliability • May require partners to reduce initial volume request • Based on weather and size of watershed • Impact on Tigard? • Provide 100% of demand thru 2050

  7. Portland Water Bureau • Wholesale Water Contract: • Negotiations continue • Data indicates PWB will NOT be the least cost alternative • Contract renewal deadline • Executive session planned for June 8th, 2004 • All wholesale customers must decide by June 30, 2004 • Contact expires June 30, 2007

  8. PWB Minimum Purchase • Portland’s Minimum Purchase Plan • Requires Tigard to take/pay for 60% of annual need • JWC supply reduces Tigard’s need for Portland water • Penalty costs range from $100–300K annually • Consultants are developing strategy to minimize cost

  9. Willamette Treatment Plant • Continue to consider Willamette as an “option” • Preliminary meetings have been held with: • Tualatin Valley Water District, Sherwood & Tualatin • Items discussed included • Water quality test results • OSU’s report on fish deformities • Shift in attitude from “anti” Willamette River activists • Tualatin to host an Open House

  10. ASR Well No. 2 • Drilling of pilot hole completed April 7, 2004 • Total dept 1,012 feet below ground surface • Results confirm ASR No. 2 will be a productive well • Specific capacity calculations show 15 - 17 gpm/ft • Air lift has been conducted and confirmed • Drilling has been authorized to proceed • Ream well to an ultimate diameter of 24 inches

  11. ASR Well No. 3 • Staff continue work on location of 3rd ASR well • Two sites have been identified • Eagles View Subdivision (old Baggenstos site) • Preferred site • More headroom for storage • Historical data from domestic wells located at the site • Future reservoir parcel (SW 150th & Woodhue St.) • Eagles View HOA has declined our request

  12. 550 – Foot Zone Reservoir No. 2 • CUP application has not yet been resubmitted • Appears the reservoir is still included in plan • Due to delays, construction will not begin this summer • Alternative sites • Consultants have provided alternative sites • Staff work to review these alternative sites

  13. Fluoride Update • Communication Plan • Media resources used • City Newsletter • Press Releases • Bill Stuffers • Focus on Tigard • Website • Public response • Scheduled date of injection – May 17, 2004

  14. Questions?

More Related