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
Desalination Feasibility Study Base Option 1) 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
1) Offshore Geology Review 2) DWR Well Log Analysis Desalination Technical Support 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 Non- Invasive Testing Biological Site Survey & Technical Memorandum in Support of Non- Invasive 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