MASTER PLAN

Master Plan

The West Basin Municipal Water District (West Basin) is one of 26 member agencies of the Metropolitan Water District of Southern California (MWD) and provides wholesale water service to approximately 1 million people on the coastal plain of the Los Angeles area. West Basin also provides regional management of the area’s water resources through production and distribution of recycled water, extensive public education, and customer water conservation programs. These activities combined have significantly reduced West Basin’s dependency on imported water. To further that reduced dependency, West Basin is integrating desalinated ocean water as a portion of their local water supply portfolio through a “stepwise approach” which has included extensive pilot testing, demonstration testing of full-scale processes, conducting numerous technical studies, and development of a comprehensive program master plan.

Piloting: Over an eight year period, West Basin conducted ocean water desalination pilot testing at the El Segundo Power Generating Station in El Segundo, California and assessed the feasibility of turning ocean water into drinking water. Various water treatment technologies (i.e., High rate pre-screening, microfiltration/ultrafiltration, reverse osmosis, etc.) were piloted and extensive water quality monitoring of the raw ocean source water, discharge concentrate, and product water quality was performed. As a result of this testing, West Basin concluded that ocean water desalination could be a viable alternative water supply and additional research was needed to further develop it as a future water supply resource.

Demonstration Project: West Basin is currently conducting larger scale testing at their Ocean Water Desalination Demonstration Facility (OWDDF) at the SEA Lab in Redondo Beach, California. The OWDDF was completed in 2010 and has been operating continuously. The OWDDF is providing West Basin with the opportunity to build on the operational protocols and challenges from piloting to establish environmentally-effective and sustainable intake technologies, determine an approach to energy usage and optimization/minimization, develop process optimization protocols, determine operational requirements, establish target water quality goals, and evaluate concentrate discharge management options. The OWDDF includes an evaluation of passive screening and subsurface intake systems, energy consumption and optimization analysis and an intensive brine discharge study. The results of the two to three year demonstration project will be used as the foundation for development of a full-scale design, permitting, and operations approach.

Comprehensive Planning: West Basin continues developing ocean water desalination as a reliable and local water supply source and is defining and assessing the critical components of a full-scale ocean water desalination program. The assessment results and desalination program requirements are documented in this Ocean Water Desalination Program Master Plan (PMP).

West Basin’s Ocean Water Desalination Program Master Plan

The purpose of West Basin’s Ocean Water Desalination Program Master Plan (PMP) is to define the overall desalination program scope and the key project components. These critical components consist of supply availability, water demands, siting alternatives, intake and discharge facilities, treatment process engineering and technological requirements, conveyance and distribution requirements, system integration and treated water quality requirements, environmental and permitting requirements, power supply development, capital and O&M costs, project delivery, and operational requirements.

Report Organization

The PMP document is comprised of a number of technical memoranda (TM), which address each of the critical program components providing detailed narrative, analysis, calculations, exhibits, drawings, and conclusions. The PMP document is divided by TM such that each component can be referenced by section. This report division (and an objective of the PMP) is intended to be used as a technical study for the California Environmental Quality Act (CEQA)/Environmental Impact Report (EIR) process and in support of the basis of design development for the full-scale project. The PMP includes the following sections:

  • TM 1: Conceptual System Design and Program Requirements (CSDPR) –This section defines alternatives for all key project components; assesses and prioritizes these alternatives; and provides recommendations for narrowing the selection of key project components (intake, pretreatment, reverse osmosis desalination system, post-treatment and product delivery).

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  • TM 2: Power Supply Development (PSP) – This section provides an estimate for the electrical power consumption for the desalination plant and evaluates several power supply alternatives (conventional onsite generation, renewable onsite generation, and direct purchase from Southern California Edison [SCE]).

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  • TM 3: Project Entitlements and Acquisition (PEAP) – This section identifies the significant key project entitlements, such as land purchase or lease agreements, needed for program implementation and provides a plan and schedule for their acquisition.

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  • TM 4: Environmental Review Plan (ERP) – This section defines and scopes the environmental impact investigation requirements, including data obtained through technical studies related to facilities and equipment. The ERP is intended to provide a “roadmap” for the environmental review process and outline the critical issues and decision points within that process.

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  • TM 5: Project Permitting Plan (PPP) – This section lists the major regulatory permits that may be required by West Basin in order to complete the desalination project. Critical issues for each permit are identified, along with additional data and studies needed in order to prepare the permit. Content for permit applications and suggestions for negotiations of permit provisions and conditions are also discussed. Finally, this plan defines the scope and budget for the implementation of the engineering support studies needed for project permitting.

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  • TM 6: Facility Operations & Maintenance Plan (OMP) – This section identifies operational requirements, resources, staffing, management and other considerations that will be necessary to operate and maintain an ocean water desalination facility in West Basin’s service area. These parameters are optimized based on experiences gained from other desalination projects, as well as current Ocean Water Desalination Demonstration Facility (OWDDF) operation and constraints anticipated at selected sites. Operational and maintenance strategies, as well as their associated costs, are presented in an effort to assist West Basin in planning these activities for a full-scale facility.

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  • TM 7: Project Costs & Funding Plan (PFP) – This section provides an overview of complete project costs for all plant sizes and capacity buildout scenarios. It also outlines potential sources of project funding (internal, federal, state, regional, public private partnerships), assesses the viability of funding structures, and discusses the sequence and schedule of borrowings.

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  • TM 8: Project Delivery (PDP) – This section provides an overview of Alternative Project Delivery options (Design-Bid-Build, Design-Build, Design- Build Operate, Construction Manager at Risk, Design Build Own Operate Transfer, Alliance) and highlights the advantages and disadvantages of each. It also provides a more detailed comparison of Design-Bid-Build, Design-Build, and Design-Build-Operate, including an analysis of cost and schedule impacts and contractor procurement requirements for project delivery.

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