1 update ocean desalination feasibility studies karl seckel assistant general manager
TRANSCRIPT
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Update
Ocean Desalination Feasibility Studies
Karl Seckel Assistant General Manager
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South Orange County ChallengesSouth Orange County Challenges
Region is 95% dependent on imported water to meet potable demand
Single water treatment plant and two pipelines supply imported water to more than 500,000 residents and businesses
Limited groundwater, surface water
Emergency outage of the imported water delivery system could cause significant problems for residents, businesses, and the economy
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Planned Reliability Improvements Planned Reliability Improvements
System Reliability Improvements
– Lined and covered reservoirs
– Interconnections
– Ocean desalination
Supply Reliability Improvements
– Water recycling
– Water use efficiency/conservation
– Groundwater recovery projects
– Ocean desalination
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Planned Reliability Improvements (cont’d)
Planned Reliability Improvements (cont’d)
Ocean desalination is one part of the solution – and provides two benefits:
– A reliable local water source
– Emergency water supply during outages of the imported delivery system
Camp Pendleton Ocean Desal
Dana Point Ocean Desal
Orange County Cross Connector
Groundwater EmergencyService
Coastal Junction Pump Connection IRWD to South County Pump Station
IRWD to JTM P
PP
D
D
Diemer Filtration Plant
GW
Coastal Pipeline to SD County
Central PoolAugmentation Project Alignments
P
P
Lake Mathews
Projects Further Out in Time:
Camp Pendleton Ocean Desal
Central Pool Augmentation Project
Coastal Pipeline to SD County
Orange County Cross $30 25+ ConnectorGW Emergency $15 15Service
Coastal Junction $2 20Pump Connection
IRWD to JTM $16 50
IRWD to SCPS $23 50
Dana Point Ocean Desal $? ?
Total $166 135±(1)
(1) Project Capacities are not all additive
Cost Capacity Component $M CFS
SOUTH ORANGE COUNTYWATER RELIABILITY PROJECTS
SOUTH ORANGE COUNTYWATER RELIABILITY PROJECTS
Upper & Lower $80 32Chiquita Reservoirs
Upper Chiquita Reservoir
Lower Chiquita Reservoir
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Dana Point Ocean DesalinationDana Point Ocean DesalinationSubsurface Intake System No entrainment/impingement impacts
Reduces ocean construction impacts
Improved chance for permitting approval
Pretreatment – natural sand and gravel filtration could eliminate need for costly pre-filtration step
Questions to be Answered: Capacity of intake system
Which technology to use for well intake
Power source for treatment plant
Use of existing outfall system for brine discharge
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Working with Federal, State and Local AgenciesWorking with Federal, State and Local Agencies U.S. EPA U.S. Bureau of Reclamation U.S. Fish and Wildlife Service U.S. Army Corps of Engineers California Department of Water Resources California State Lands Commission California Department of Parks and Recreation California Department of Fish and Game California Coastal Commission San Diego Regional Water Quality Control Board County of Orange City of Dana Point South Coast Water District Metropolitan Water District of Southern California
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Phase 1 Exploratory Test Boring SitesPhase 1 Exploratory Test Boring Sites
Bore Hole//Monitoring Well
Bore Hole
Future Desalination Site
SOCWA Outfall
B3
B1
B2/M1
B4/M2
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Dana Point Phase 1 Hydrogeology ConclusionsDana Point Phase 1 Hydrogeology Conclusions
The permeability of the aquifer formation looks promising
Need information on the formations under ocean floor
Further testing needed to:
– Estimate production capacityof the aquifer
– Analyze water quality
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Phase 2 Near Shore Test Drilling ApproachPhase 2 Near Shore Test Drilling Approach
Ocean SurfaceLand Surface
Fres
h W
ater
200 to 250 feet ±
Slant test well
Infiltration
Drill Rig
Ocean Bottom
Main Aquifer 40 to 130 feet ±
Salt
Wat
er
23o
Temporary Vault
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Full Scale Slant Well ConceptFull Scale Slant Well Concept
Subsurface Slant Wells & Collector
Intake System SOCWA Outfall
Future Desalination Plant Site
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Slant Well Intake System ConceptSlant Well Intake System Concept
P
OceanDesal Plant
gravity flow intocaisson forocean water intake
screened slant wellburiedbeachcaisson or pipecollector
pumpto plant
ocean surface
tunneled pipeline
1500 feet± from beach
pressuredifferential
Drill Rig
ocean floor
beach
land
natural filtration
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Questions or Comments?
Karl Seckel Assistant General Manager