Download - Future Water Supply - for the Ashley Valley D. Gerard Yates Central Utah Water Conservancy District
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Future Water Supply - for the Ashley Valley
D. Gerard Yates
Central Utah Water Conservancy District
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Ashley Valley Water System Overview
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Red Fleet Reservoir1982 operation 26,000 Acre Feet
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Red Fleet Dam
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Red Fleet Pump Station
1985 operational5 pumps / 2 - 8cfs (600 hp) 3 – 16cfs (1250 hp) (5/10 mgd)
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Uintah Water Conservancy District
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Tyzack Pipeline and Raw Water Bypass Chocolate Rock Pump Station - T2 & T3
1.5 mgd each
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Ashley Valley Water Treatment Plant (CUWCD)
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2 Source WatersAshley Springs / Red Fleet
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Ashley Valley Water SID Treatment Plant
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1 Direct Treatment Source2 Ways to Exchange
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Treatment Plant Overview
Two Water Treatment Plants serve the valley Each plant has been in service for more
than 25 years – delivering high quality waterEach plant has experienced increased
demands and challenging raw water quality Each plant has experienced production
limitations during poor water quality eventsChanges 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)
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Ashley Valley Water Treatment Plant Process Improvement Project
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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)
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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
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Zeta Potential
Dissolved Air Flotation
U.V.
Pilot Plant Testing
Jar Testing
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Source Water Differences ?
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Site Constraints - geology
17 Acres – 20 MGD – ? Expansion to 30 MGD
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Direct or Conventional ?
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Filters / Under drains ?
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Solids Handling ?
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Finished Water Storage
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Disinfection By-Products ?
Duchesne Valley – Ozone Ashley Valley – Conventional &
Blending
Utah Valley – Ozone & Conventional
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Data and Process Evaluation(Decision Making)
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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
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Ashley Valley Decisions Continued…
Construct new a new “backwash” waste water clarifier
Install a chlorine scrubber
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Flocculation/Sedimentation
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2 New Plate Settlers
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6 Constant Level – Deep Bed Filters
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New Flash Mix
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New Backwash Clarifier
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New Chemical Feed System
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New Chlorine Scrubber
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Old Plant / New Plant
15 MGD - unreliable
20 MGD - reliable
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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 MGDOne shift per day operation
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Ashley Valley Total Plant Production
Both plants peak daily average is 6.5MGD AVWSID plant = 8 MGDCUWCD plant = 20 MGD2012 production both plants = 7365 acre feet10 year average = > 30 percent production
increase Present growth rate in 10 years the valley will
need an additional 2400 acre feet of treated water.
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Uintah County Population Growth2000-2010 = 22.6%
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Vernal City Water System 27% / 16%
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Ashley Springs is a limited supply Spring highest production = poor quality
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Red Fleet Reservoir (Brush Creek Spring)
The Future Supply for the Valley
2000 Acre Feet Presently Petitioned3300 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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There is More Than One Way to Get a Drink of Water in the Ashley Valley
Questions????