LAS VEGAS ON-CALL ENGINEERING SERVICES
� Introductions
� Purpose of Meeting
AGENDA
� Components of the Water System
� Major Issues
� Consultant Presentations on Alternatives
� Groundwater Supply
� Raw Water System Improvements
� Finished Water Facilities
� Reuse water
� Feedback / Comments
2
� CITY OF LAS VEGAS
INTRODUCTIONS
� MAYOR: Alfonso E. Ortiz, Jr.
� COUNCIL MEMBERS:
� Tonita Gurule-Giron
� Diane Moore
� Andrew Feldman
� David Romero
� CITY MANAGER: Timothy Dodge
� UTILITY DIRECTOR: Ken Garcia
3
CHUDNOFF CONSULTING
Mustafa Chudnoff
• Water Rights
• Potable & Reuse Demand Patterns
DANIEL B. STEPHENS
John Kay, P.G.
• Well (Capacity, Locating, Design)
• Groundwater Modeling
CONSULTANTS
SOUDER MILLER & ASSOCIATES
Francisco (Kiko) Martinez, P.E.
• Project Coordination
WHPACIFIC / URS
Tod Phinney, P.E.
• Surface Water Diversion
• Dam Structures
MOLZEN CORBIN
Ron Mosher, P.E.
• Advanced Water Treatment
• Transmission / Distribution
• Treated Water Storage/Pumping
• Reuse Water
4
PURPOSE OF MEETING
� Address the issues that affect the delivery of a
sustainable water supply to you
� Discuss the components of the water system
� What are the major issues?
� Present alternatives to solve the issues in the
short term and long term
�Feedback
5
COMPONENTS OF THE WATER SYSTEM
• Water Supply
• Gallinas River (Raw Water)
• Groundwater from the Taylor Well Field
• Raw Water Storage
• Peterson and Bradner Reservoirs
• Storrie Lake
6
COMPONENTS OF THE WATER SYSTEM
• Surface Water Treatment Plant
• Finished Water Distribution System
• Delivers Water to Your Tap via a System of
Pipelines, Valves, Pumps and Water Tanks
9
EXISTING FINISHED
WATER DISTRIBUTION SYSTEM
• Drought
MAJOR ISSUES
• Groundwater and surface water supplies are
limited
• Aging infrastructure
• Growth in population
• Funding
11
CONSULTANT PRESENTATIONS
ON ALTERNATIVES
� Groundwater Supply: Daniel B. Stephens –
John Kay
� Raw Water Supply and Storage:
WHPacific – Tod Phinney, P.E.
� Finished Water System and Storage:
Molzen-Corbin – Ron Mosher, P.E.
� Reuse: Molzen-Corbin – Ron Mosher, P.E.
12
GROUNDWATER SUPPLY
� DANIEL B. STEPHENS & ASSOCIATES, INC.
WHY DO WE NEED GROUNDWATER?
To provide safety net and augment shortages in
surface water supply:
1. Non-Drought Years
- Maintain an operational reserve
- Meet peak demand
- Meet increased demand as population
grows
2. Drought
- offset shortages in surface water
Groundwater Supply (acre-feet/year)
1500
1200
900
600
300
NON-DROUGHT GW DEMAND
Projected Average Year GW Requirements
Operational Reserve Supply Requirement Total Production Capacity
0
2010 2015 2020 2025 2030 2035 2040 2045 2050
Year
Groundwater Supply (acre-feet/year)
1500
1200
900
600
300
DROUGHT GW DEMAND
Projected Average Year GW Requirements
Operational Reserve Supply Requirement Total Production Capacity
0
2010 2015 2020 2025 2030 2035 2040 2045 2050
Year
EXISTING
GROUNDWATER
SUPPLY
Taylor Well Field
• Constructed in 1950’s
• Originally six operational
wells
• 1,500 acre-ft/year water
right
• Currently one operational
well
• 400 ac-ft/year capacity
HYDROGEOLOGIC SETTING
HYDROGEOLOGIC SETTING
A A’
West of TWF
Taylor
Well Field
East of TWF
Gallinas
River
ALTERNATIVES IDENTIFIED
1. Replace Wells in Taylor Well Field
2. New Wells West of Taylor Well Field
3. New Wells East of Taylor Well Field
4. Brackish Groundwater Desalination
5. Effluent Use for Aquifer Storage and Recovery
6. Effluent Exchange for Potable Supply
7. Groundwater Importation from Santa Rosa Area
8. Groundwater Importation from Ribera Area
EVALUATION OF ALTERNATIVES
� Cost
� Ability to meet supply needs
� Water rights issues
� Environmental Permitting
� Complexity of Operation
� Implementation Time
� Environmental Stewardship
GW SUPPLY PHASING
Implementation in 3 phases over next 40 years :
Phase 1: Replace Taylor Wells
Phase 2: To be determined
Phase 3: To be determined
Groundwater Supply (acre-feet/year)
1000
900
800
700
600
500
400
300
200
100
0
GW SUPPLY PHASING
Meeting Projected Average Year GW Requirements
Varying proportions of
Taylor Well Field and
Phase 2.
Taylor Well Field Phase 2 Phase 3
2010 2015 2020 2025 2030 2035 2040 2045 2050
Year
RAW WATER SYSTEM IMPROVEMENTS
� Raw Water Diversion, Conveyance, and Storage
(WHPacific)
� Raw Water Storage at Peterson and Bradner Reservoirs
(URS)
RAW WATER SYSTEM IMPROVEMENTS
� Raw Water Diversion, Conveyance, and Storage
(WHPacific)
� Raw Water Storage at Peterson and Bradner Reservoirs
(URS)
EXISTING RAW WATER SYSTEM
Pre-Sedimentation
Basin
EXISTING RAW WATER SYSTEM
EXISTING RAW WATER STORAGE
Community 1
(Wyoming)
Community 2
(Front Range,
Colorado)
Community 3
(Western Slope,
Colorado)
Community 4
(New Mexico)
Las Vegas
(New Mexico)
0.0 1.0 2.0 3.0 4.0
Annual Demand
(normalized to 1)
Total Storage
(as a factor of
Annual Demand)
ALTERNATIVES EVALUATED
� Peterson Reservoir $15,000,000 - 20,000,000
� Improvements – add up to 1,000 Ac-ft
� Bradner Reservoir $18,000,000
� Improvements – add up to 900 Ac-ft
� Storrie Lake Berm: $60,000,000
� Improvements and Acquisition – add ~2,200 Ac-ft
Flood: $24,000,000
� Lake Isabel and Lake David $32,000,000
� Acquisition – add ~1,000 Ac-ft (per foot depth)
� McAllister Lake $24,000,000
� Improvements – add ~190 Ac-ft (per foot depth)
RAW WATER SYSTEM IMPROVEMENTS
� Raw Water Diversion, Conveyance, and Storage
(WHPacific)
� Raw Water Storage at Peterson and Bradner Reservoirs
(URS)
PER ALTERNATIVES FOR PETERSON
AND BRADNER DAMS
EXISTING CONDITION (PLAN & PROFILE)
EL. 6786’
PETERSON DAM:
CONCRETE THIN ARCH (PLAN VIEW)
PETERSON DAM:
ROLLER COMPACTED CONCRETE (RCC) RAISE
(PLAN & PROFILE VIEWS
PETERSON DAM:
CONCRETE THIN ARCH RAISE (SECTION)
50’ TBD
(MAXIMUM 49’)
1204 AC-FT INCREASE ≈ $20 MILLION
500 AC-FT INCREASE ≈ $11 MILLION
250 AC-FT INCREASE ≈ $8 MILLION
FIX EXISTING DAM ≈ $0.5 - 4 MILLION
PETERSON DAM:
RCC RAISE (SECTION)
TBD
(MAXIMUM 49’)
1204 AC-FT INCREASE ≈ $16 MILLION
500 AC-FT INCREASE ≈ $10 MILLION
250 AC-FT INCREASE ≈ $7 MILLION
FIX EXISTING DAM ≈ $0.5 - 4 MILLION
BRADNER DAM:
EXISTING CONDITIONS (PLAN VIEW)
NORTH
BRADNER DAM:
904 AC-FT CAPACITY INCREASE (PLAN VIEW)
BRADNER DAM:
904 AC-FT CAPACITY INCREASE (SECTION)
TBD
(MAX 47’)
TBD
PRIMARY DAM
AUXILIARY DAM
NOT TO SCALE
FINISHED WATER FACILITIES
� MOLZEN-CORBIN
40
Finished Water Facilities
Preliminary Engineering Report
March 24, 2011
FINISHED WATER PER COMPONENTS
�Surface Water Treatment Plant
�Water Distribution System
�Finished Water Storage Tanks
�Effluent Reuse Facilities
FINISHED WATER PER
Surface Water Treatment Plant (SWTP) Issues:
� Seasonal taste and odor
� Consistent compliance with one part of the Drinking Water
Standards
� Minor plant improvements related to operation and
maintenance
� Alternative 1 - No Action
SWTP would not be able to consistently meet total
trihalomethane (TTHM) and total haloacetic acid (HAA5)
standards and the SWTP would continue to have operation
and maintenance issues
FINISHED WATER PER
Surface Water Treatment Plant
� Alternative 2 – Facility Improvements
� Priority 1 Improvements
� Reduce TTHMs and HAA5 to safely meet drinking water
standards and improve taste and odor problems
� Add oxidation treatment ($2,540,000)
� Add cover over clarifiers ($383,000)
� Priority 2 Improvements
� Improve operation and maintenance of Plant ($415,000)
� Filter building roof repair, filter building settlement correction,
alum tank cover, sludge pond modifications
FINISHED WATER PER
Surface Water Treatment Plant
� Alternative 3 (long term) - Facility modifications
to increase capacity assuming current source water
($4,260,000)
Water Distribution System Issues:
�Water loss (known and unknown locations)
�Fire protection
�Dead end lines
FINISHED WATER PER
�Operation and maintenance
� Alternative 1: No Action
System would continue to experience about 23% water loss,
water quality concerns would continue, and insufficient fire
protection capacity in some areas of the City would
continue
FINISHED WATER PER
Water Distribution System
� Alternative 2: System Improvements
� Continue Leak Detection and Repair program to address
existing leaks ($11,000,000 or $550,000/year)
� Phased Improvements to address fire protection, water
quality, and known operation and maintenance items
� Phasing will be determined in final PER based on input from
City staff and funding availability
FINISHED WATER PER
Finished Water Storage Tanks Issues:
�Three existing tanks are in need of inspection and
potential rehabilitation
� Alternative 1: No Action
� Cabin Site and Camp Luna tanks susceptible to failure
� Alternative 2: Inspection and Rehabilitation of
Existing Tanks
� Cabin Site estimated at $530,000
� Camp Luna estimated at $446,000
� Valencia rehabilitated in 2004, needs inspection ($15,000)
FINISHED WATER PER
� The City considers treated effluent to be a
valuable water resource
� Summary of Effluent Reuse
� 2009 effluent available for reuse: 0.60 MGD
� 2009 effluent reused: 0.2 MGD (February-November)
� 2020 projected available effluent: 0.70 MGD
� 2050 projected available effluent: 1.28 MGD
FINISHED WATER PER
� Potential uses of treated effluent
include:
• Replace a current potable use
• Exchange with any user of Gallinas water who is
willing to use effluent rather than surface water,
considering that treated effluent is consistently
available
• Supplement the City’s raw water supply
FINISHED WATER PER
� A decision tree was developed to aid in the
evaluation of possible effluent reuse options
� Several of the options, although seemingly logical, have a
“fatal flaw” that make the option not feasible for further
study (i.e., aquifer storage and recovery which would
require treating to Drinking Water Standards and
multiple injection wells 600 – 800 feet deep)
� All options without a “fatal flaw” are being studied in
more depth
� The results are short term and long term alternatives for
the City to pursue
FINISHED WATER PER
Short Term Alternatives for Effluent Reuse (Use # 1)
� Alternative 1: No Action
• Continue with irrigation of existing parks
� Alternative 2: Phased expansion of system
� Phase 1 - Expand existing facilities to irrigate more City parks
and ball fields ($2,500,000)
� Phase 2 - Construct facilities to create a gravity-fed system to
maximize daily effluent use ($689,800)
� Alternative 3: Non-phased expansion of system
� Construct Phase 1 and Phase 2 concurrently ($2,859,800 -savings
of $330,000)
FINISHED WATER PER
� Potential Long Term Alternatives for
Effluent Reuse (Uses #2 and #3)
� Alternative 1: Seasonally pump effluent to
McAllister in exchange for NM Game and Fish shares
of Storrie Lake project water
� Alternative 2: Pump estimated 0.4 to 0.6 mgd of
effluent to Storrie Lake for storage and maximize
utilization of this resource
� Alternative 3: Store/transfer water for use by the
acequias
FINISHED WATER PER
Any Long Term Alternatives for Effluent
Reuse will Address:
� Negotiations with agencies/entities to resolve
identified concerns (i.e., water quality, seasonal uses,
and dilution rates)
� Evaluation of treatment facilities to further improve
the quality of the effluent
� Facilities required to pump/store water
NEXT STEPS
� Public and Stakeholders provide comment
and feedback
� Complete Draft PER by June 2011
55
FEEDBACK / COMMENTS
56
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