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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 reservoir

1982 operation 26,000 Acre Feet

Red Fleet Reservoir



Red fleet pump station
Red Fleet Pump Station

1985 operational

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



Tyzack pipeline and raw water bypass chocolate rock pump station t2 t3
Tyzack Pipeline and Raw Water Bypass Chocolate Rock Pump Station - T2 & T3

1.5 mgd each



2 source waters ashley springs red fleet
2 Source WatersAshley Springs / Red Fleet


Ashley valley water sid treatment plant
Ashley Valley Water SID Treatment Plant


1 direct treatment source 2 ways to exchange
1 Direct Treatment Source2 Ways to Exchange


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 Project

  • 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 Project

  • 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


Zeta Potential Project

Pilot Plant Testing

Dissolved Air Flotation

Jar Testing

U.V.



Site constraints geology
Site Constraints - geology Project

17 Acres – 20 MGD – ? Expansion to 30 MGD






Disinfection by products
Disinfection By-Products ? Project

Ashley Valley – Conventional & Blending

Duchesne Valley – Ozone

Utah Valley – Ozone & Conventional


Data and process evaluation decision making

Data and Process Evaluation Project (Decision Making)


Ashley valley plant decisions
Ashley Valley Plant Decisions Project

  • 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… Project

  • Construct new a new “backwash” waste water clarifier

  • Install a chlorine scrubber





New flash mix
New Flash Mix Project



Ne Project w Chemical Feed System



Old plant new plant
Old Plant / New Plant Project

15 MGD - unreliable

20 MGD - reliable


Plant results to date
Plant Results to Date Project

  • 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 Project 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.


Uintah county population growth 2000 2010 22 6
Uintah County Population Growth Project 2000-2010 = 22.6%


Vernal city water system 27 16
Vernal City Water System Project 27% / 16%


Ashley springs is a limited supply spring highest production poor quality
Ashley Springs is a limited supply Project Spring highest production = poor quality


Red fleet reservoir brush creek spring the future supply for the valley
Red Fleet Reservoir Project (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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