Montecito Water District Desalination Facilities Status Update

Montecito Water District
Desalination Facilities
Status Update
Board of Directors Meeting
March 17, 2015
Desalination Studies Update
1)
Desalination Feasibility Study
2)
Desalination Technical Support
3)
Desalination Site Alternatives
4)
Cemetery Site Alternative
1) Non-invasive Test Program
2) Test Well & Test Drain
3) Conceptual desalination plant
5)
Next Steps
Desalination Feasibility Study (Oct 2014)
1)
Desalination Plant Sites (10)
2)
Seawater Intake Sites (5)
3)
Concentrate Discharge Alts (6)
4)
Conveyance Alternatives
5)
“Base Case”
6)
Cost Estimates
1)
Desalination Feasibility Study
Base Option
MWD Yard Site
2)
Seawater Intake Site
3)
Feedwater Conveyance
4)
Brine Conveyance
5)
Concentrate Discharge Site
(Miramar or MSD)
6)
Energy, O&M, Financing
7)
Cost Estimates
• 2.5 MGD – 4.0 MGD plant
• 8 Options from $68M to $85M (capital)
• Excludes ROW acquisition
Desalination Technical Support
1)
Offshore Geology Review
2)
DWR Well Log Analysis
3)
Stakeholder Communications
4)
Additional tasks as directed by the General
Manager or Board, including:
a. MSD coordination
b. Santa Barbara Desalination Project
evaluation
c. Project funding/cost analyses
Desalination Site Alternatives
• MSD Site
–
MSD “treatment plant site planning study” due next month
• MWD Yard Site
–
–
Cultural Site Survey
Biological Site Survey
• Cemetery Site
–
–
Intake Program Project Description
Cemetery Site - Development of Non-Invasive Testing Plan
Feed Water
Pump
Ocean Intakes
Ocean Outfall
Cemetery Site Overview
• Seawater Intake Site
–
–
–
–
Hydrogeologic review
Test Intake Program
Ultimate Project Configuration
Construction & Operation Effects
• Desalination Plant Site
– Site Configuration
– Construction & Operation Effects
Cemetery Site- Non-invasive Testing
• Non-invasive Agency
Permits/Approvals
– Permit Application to State Lands
Commission for Non-Invasive Testing
– Permit Application to California Coastal
Commission for Non-Invasive Testing
– Notice of Exemption to County of Santa
Barbara for Non-Invasive Testing
– Preparation of Marine Wildlife
Contingency Plan for Non-Invasive
Testing
– Preparation of Hazards Response Plan
for Non-Invasive Testing
– Cultural Site Survey & Technical
Memorandum in Support of NonInvasive Testing
– Biological Site Survey & Technical
Memorandum in Support of NonInvasive Testing
Intake Facilities Overview
• Two Types of Seawater Intakes Considered
– Slant Wells
– Seafloor Drains
• Test Intake Program
– Side by Side Comparison to Determine Best Intake Technology
• Ultimate Project Facilities
– Installation of Additional Intakes
Slant Wells
• Drilled at 15-25 Degree Angle (From Horizontal)
• Submersible Pump Installed to Extract Seawater
• Special Non-Corrosive Well & Pump Materials
Collector Pipeline to
Desalination Plant
Seafloor Drain (Neodren)
• Flexible Non-Corrosive Permeable Pipe Installed by
Horizontal Directional Drilling (HDD)
• Installed 10 to 20 feet Below Seafloor
• Submersible Pump in Each Drain
Test Seafloor Drain
• Approximately 1,000 to 1,500 ft. Long
• Installed Using Horizontal Directional Drilling (HDD)
• Up to 17” Diameter Permeable Pipe
• Installed to a Depth of 10 ft. to 20 ft. Below Seafloor
• Submersible Pump w/ Capacity of 1,100 gpm
• Drainhead Enclosed in Below-Grade Concrete Vault w/
Access Hatch Flush with Ground Surface
Additional Site Features
Discharge Pipeline
• 1,500 ft. Long, 18 inch Diameter HDPE Pipe
• Installed Using (HDD) – Same Technology as
Seafloor Drain
• Includes 8 ft. Diameter Concrete Manhole
Flush with Ground Surface
• Ultimately Concentrate (Brine) from Reverse
Osmosis Treatment Plant Conveyed by Pipe
Test Program Layout
Seafloor Drain Configuration
2.5 MGD Project
Assuming Seafloor Drain Best Technology
Converted Test Seafloor Drain
1.4 MGD
Three Additional Seafloor Drains 4.2 MGD
Total Feed Water
5.6 MGD
Seafloor Drain Configuration
Potential Desalination Plant Site
• Approx. 2.4 Acres
• Relatively Flat Site
• Close Proximity to
Intake/Discharge
• Site Allows for 2.5
MGD Plant w/ Space
for Expansion
Conceptual Layout of Plant
Recommended Implementation Plan
1) Non-invasive Testing – Having received Cemetery site access approval, these
studies would be completed in April/May, depending on regulatory agency
permit approval process.
2) Initiate Permitting & Design for Test Seafloor Drain (June 2015)
3) Initiate Permitting of Montecito Desalination Facility (June 2015)
a) Initiate a formal outreach with stakeholders
b) Site Alternatives for evaluation in CEQA document
c) CEQA/NEPA compliance and regulatory permitting
d) Utility & agency permitting and ROW
4) Develop Financing/Funding Plan (June 2015)
5) Construct Test Seafloor Drain (early 2016)
a) Producing test drain water Summer 2016
6) Initiate Procurement Process for Desalination Plant (November 2015)
7) Initiate Design of Intake, Discharge & Conveyance Facilities (Jan 2016)
Questions