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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

Future Water Supply - for the Ashley Valley

D. Gerard Yates

Central Utah Water Conservancy District

red fleet pump station
Red Fleet Pump Station

1985 operational

5 pumps / 2 - 8cfs (600 hp) 3 – 16cfs (1250 hp) (5/10 mgd)

treatment plant overview
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)
general plant process limitations
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)
process improvement evaluation
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
slide17

Zeta Potential

Pilot Plant Testing

Dissolved Air Flotation

Jar Testing

U.V.

site constraints geology
Site Constraints - geology

17 Acres – 20 MGD – ? Expansion to 30 MGD

disinfection by products
Disinfection By-Products ?

Ashley Valley – Conventional & Blending

Duchesne Valley – Ozone

Utah Valley – Ozone & Conventional

ashley valley plant decisions
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
ashley valley decisions continued
Ashley Valley Decisions Continued…
  • Construct new a new “backwash” waste water clarifier
  • Install a chlorine scrubber
old plant new plant
Old Plant / New Plant

15 MGD - unreliable

20 MGD - reliable

plant results to date
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
ashley valley total plant production
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.
red fleet reservoir brush creek spring the future supply for the valley
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.
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