wp mp-update-camp pendleton.-april_25_2013
TRANSCRIPT
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Report on Evaluation of Proposed Camp Pendleton
Seawater Desalination Project
Water Planning Committee
APRIL 25, 2013
Cesar Lopez Senior Water Resources Specialist
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Presentation Outline
Background Report on latest planning and technical
studies Off-Shore Technical Studies Site Development Evaluations Product Water Conveyance Analyses
Preliminary Cost Estimates
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Proposed Desalination Project
• 50 - 150 mgd seawater RO Project
• Phased implementation
• Unique, large coastal site at top of Aqueduct system
• 2 potential sites approved by the Base for further study
• Unlike Carlsbad, project would require new seawater intake and discharge facilities
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Potential Project Benefits to Camp Pendleton
• RELIABILITY – Drought-proof water supply located on the base
• WATER QUALITY – High quality product water – Potential blending opportunity
• OCEAN OUTFALL – Potential for dual-use outfall for treated wastewater and concentrate
from desalination plant
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Project Background
• Conceptual feasibility study completed
• Board added additional technical and environmental studies to CIP in 2009
• Planning MOU between SDCWA and MCBCP executed in 2010 established framework for cooperation during performance of studies
• Consultant contracts executed in 2011 for: • Technical Studies – Issues and impacts of offshore facilities • Site Development Evaluations – Plant and onshore infrastructure • Product Water Conveyance System Analyses
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Technical Studies Objectives
Intakes: • Determine viability of subsurface intake
• Permitting agencies will require evaluation of alternative intake methods
• Considered to have least impact to marine life
• Locate and configure open ocean intake • Can be designed to minimize marine impacts
Brine Discharge:
• Locate and configure discharge system
• Minimize marine impacts
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Technical Studies - Geologic / Hydrogeologic Investigations
• Conducted Geophysical Survey using seismic reflection
• Drilled exploratory boreholes
• Constructed test well and pump tested offshore aquifer
• Built Groundwater Model
Key Findings: • Large sub-seafloor ancient river channel
• Potential favorable geology to support large subsurface intake system
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Technical Studies - Marine Environment Investigations
• Physical Oceanography – Ocean currents – Wave pressure
• Water Quality Monitoring and Sampling
– Temperature – Salinity – Boron / Bromide – Etc.
• Marine Biology Monitoring and Sampling – Ichthyoplankton (larvae) – Phytoplankton (algae) – Demersal Species (fish) – Infauna Invertebrate (sea-floor habitants)
Key Findings: • Typical marine environment –
nothing unusual • No fatal flaws to siting open
ocean intake and discharge 8
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• Ancient river channel provides favorable geology for developing a sub-surface intake
• Open ocean intakes are feasible with low and manageable marine environment impacts
• Potential lower cost
• Oceanographic conditions (i.e. ocean currents, wave action) and marine habitat in project area are favorable for siting a brine discharge diffuser system at approx. 40 ft. depth
• Geotechnical conditions are suitable for soft-ground tunnel construction
Technical Studies – Key Conclusions
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Site Development Evaluations Objectives
• Analyze site access, traffic flow, space availability and security • Determine optimal and reliable treatment processes for project
• For maximum utilization, consider producing “untreated” water
• Determine power requirements, supply source and transmission
• Screened Open Ocean
• Subsurface
Prepare water for desalination process
• Conventional or membrane process
• Desalination Process
• Re-hardening • Disinfection
Residual
• Treated Water System • Untreated Water System
Pre-treatment
Intake System
Reverse Osmosis
Post Treatment
Key Treatment Process Design Elements
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MCTSSA Site Rendering
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SRTTP Site Rendering
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• Both sites are viable for construction and operation
• SRTTP Site offers the best site access
• “Untreated” water production possible • Maximum plant utilization • Eliminates any potential overlap with treatment plant production • Increased cost of “re-treatment” • Cost savings likely due to reduced chemical requirements and potential
elimination of second pass RO
• Phase 1 (50 mgd) project can be supported by existing power supply infrastructure.
• Future phases would require new power supply infrastructure ($91 - $164 million)
Site Evaluations – Key Conclusions
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Product Water Conveyance Analyses
• 19 – 21 miles 72 inch diameter pipeline
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Product Water Conveyance Key Conclusions
• The southern alignment provides the best opportunity for efficient integration into the Water Authority Aqueduct system
• Shorter alignment • Best alignment for both untreated and treated water integration • least direct impact to MCBCP
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Elev
atio
n (ft
)
Length (ft)
Pipeline Reach
HGL of Pipeline 4EL 1242
150 MGD – EL 1300100 MGD – EL 127250 MGD – EL 1254
2A 2B 2C 2D 2E 2F 2G
Proposed Forebay and Pump StationEL 650Proposed Desalination
Facilities and Pump StationEL 60
150 MGD – EL 892100 MGD – EL 767
50 MGD – EL 686
Ground Profile
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Capital Cost Summary
50 mgd Initial Phase
Plant Site
Seawater Intake
Desalination Plant
Brine Discharge
Conveyance System
Total
MCTSSA $218 - $360 $670 - $698 $184 $328 $1,428 - $1,542
SRTTP $241 - $369 $636 - $663 $207 $317 $1,429 - $1,529
Based on supply integration into the untreated system. Costs include oversizing buried project components for the 150 mgd ultimate capacity.
Costs in million $
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Cost Estimate Summary
Plant Production Capacity 50 mgd 150 mgd
Capital Costs (million$) Desalination Plant 1,110 – 1,260 2,320 – 2,900 Conveyance 317 – 328 350 – 360 Annual O&M Costs (million$) 61 - 70 174 - 200
Total Unit Cost ($ per AF) 2,750 - 3,100 2,070 - 2,450
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Questions?
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