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Future Water Supply - for the Ashley Valley

Future Water Supply - for the Ashley Valley. D. Gerard Yates Central Utah Water Conservancy District. Ashley Valley Water System Overview. 1982 operation 26,000 Acre Feet. Red Fleet Reservoir. Red Fleet Dam. Red Fleet Pump Station. 1985 operational

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Future Water Supply - for the Ashley Valley

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  1. Future Water Supply - for the Ashley Valley D. Gerard Yates Central Utah Water Conservancy District

  2. Ashley Valley Water System Overview

  3. 1982 operation 26,000 Acre Feet Red Fleet Reservoir

  4. Red Fleet Dam

  5. Red Fleet Pump Station 1985 operational 5 pumps / 2 - 8cfs (600 hp) 3 – 16cfs (1250 hp) (5/10 mgd)

  6. Uintah Water Conservancy District

  7. Tyzack Pipeline and Raw Water Bypass Chocolate Rock Pump Station - T2 & T3 1.5 mgd each

  8. Ashley Valley Water Treatment Plant (CUWCD)

  9. 2 Source WatersAshley Springs / Red Fleet

  10. Ashley Valley Water SID Treatment Plant

  11. 1 Direct Treatment Source2 Ways to Exchange

  12. Treatment Plant Overview • Two Water Treatment Plants serve the valley • Each plant has been in service for more than 25 years – delivering high quality water • Each plant has experienced increased demands and challenging raw water quality • Each plant has experienced production limitations during poor water quality events • Changes in drinking water regulations present challenges at each plant • Peak production at each plant is 6-7 MDG (CUWCD rated capacity was15 MDG – AVWSID plant rated capacity 8 MGD)

  13. Ashley Valley Water Treatment Plant Process Improvement Project

  14. General Plant Process Limitations • QUALITY (Lack the ability to sufficiently address increasing disinfection by-product formation) • QUANTITY (Lack the ability to treat degrading quality raw water (<5 NTU 75% of time, shut down if > 20 NTU for 3 hours or >30 NTU) • EFFICIENCY (Short “unit filter run volumes” result in higher operating costs and solids handling challenges – long hours for plant staff)

  15. Process Improvement Evaluation • Evaluate if the existing direct filtration process is suitable from a regulatory perspective for both sources • Evaluate the reliable plant capacity achievable with direct filtration • What new processes would be required to reliably produce at the plant rated capacity? • What new processes would be required to reliably meet present and future drinking water regulations

  16. Zeta Potential Pilot Plant Testing Dissolved Air Flotation Jar Testing U.V.

  17. Source Water Differences ?

  18. Site Constraints - geology 17 Acres – 20 MGD – ? Expansion to 30 MGD

  19. Direct or Conventional ?

  20. Filters / Under drains ?

  21. Solids Handling ?

  22. Finished Water Storage

  23. Disinfection By-Products ? Ashley Valley – Conventional & Blending Duchesne Valley – Ozone Utah Valley – Ozone & Conventional

  24. Data and Process Evaluation(Decision Making)

  25. Ashley Valley Plant Decisions • Reliably treat 20 MGD • Construct a new initial hydraulic mix and chemical feed system (lead and copper) • Construct a new floc / sedimentation process (direct to conventional) • Construct new deep-bed filters with full-rate filter to waste, a new underdrain system, and convert from declining rate filters to constant rate constant level

  26. Ashley Valley Decisions Continued… • Construct new a new “backwash” waste water clarifier • Install a chlorine scrubber

  27. Flocculation/Sedimentation

  28. 2 New Plate Settlers

  29. 6 Constant Level – Deep Bed Filters

  30. New Flash Mix

  31. New Backwash Clarifier

  32. New Chemical Feed System

  33. New Chlorine Scrubber

  34. Old Plant / New Plant 15 MGD - unreliable 20 MGD - reliable

  35. Plant Results to Date • The Ashley Valley Plant has been in operation for 9 months (with all Process Improvements Operational) and is meeting all goals and objectives. • The plant is rated for 20 MGD • One shift per day operation

  36. Ashley Valley Total Plant Production • Both plants peak daily average is 6.5MGD • AVWSID plant = 8 MGD • CUWCD plant = 20 MGD • 2012 production both plants = 7365 acre feet • 10 year average = > 30 percent production increase • Present growth rate in 10 years the valley will need an additional 2400 acre feet of treated water.

  37. Uintah County Population Growth2000-2010 = 22.6%

  38. Vernal City Water System 27% / 16%

  39. Ashley Springs is a limited supply Spring highest production = poor quality

  40. Red Fleet Reservoir (Brush Creek Spring) The Future Supply for the Valley • 2000 Acre Feet Presently Petitioned • 3300 Acre Feet – Presently Available (2400 needed within 10 years) • 12,000 Acre Feet – Additional Jensen Unit Water available with addition of the Burns Bench Pump Station.

  41. There is More Than One Way to Get a Drink of Water in the Ashley Valley Questions????

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