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EBMUD/ZONE 7 Regional Reliability Intertie

Project URL link
Sponsoring Agency EBMUD / Zone 7 / CCWD / SCVWD / SFPUC / ACWD
Subregions ('East Bay', 'South Bay', 'West Bay')
Counties Alameda, Contra Costa, Santa Clara
Watershed Tributary
Public or private land? ('Public',)
Location (lat/lon) 37.722999075738464, -121.94248080253601
Start Date Currently in progress
End Date 12/31/2017
Location Description This project is located where the EBMUD and Zone 7 service area are contiguous in San Ramon, California.
EBMUD/ZONE 7 Regional Reliability Intertie

This project is a new intertie between Zone 7 and EBMUD's service area, which is one of the last critical components to improving regional water supply reliability. Not only will the intertie facilitate the exchange of water supplies between the Bay Area's five largest water agencies, including future water supplies (e.g., Bay Area Regional Desalination and water transfers), but it is also critical lifeline to Zone 7 - Zone 7 has no other interties. This project also connects the southeastern part of EBMUD's service area to a water source during a catastrophic event (e.g., earthquake).

The Bay Area’s major water agencies are working together to develop a regional solution to improve the water supply for over 6 million residents and thousands of businesses and industries. This Bay Area Regional Reliability (BARR) Partnership includes Alameda County Water District, Contra Costa Water District, East Bay Municipal Utility District, Santa Clara Valley Water District, San Francisco Public Utilities Commission, and Zone 7 Water Agency.

A critical need identified by the BARR Partnership is to work cooperatively to inter-connect their water systems with interties to leverage existing facilities and, if needed, build new ones (e.g., desalination, infiltration, treatment, or storage) to bolster regional water supply reliability to protect against droughts and emergencies, while preparing for climate change. For example, after disruptions in regular water supply sources or during planned outages of critical systems, the BARR Partnership could wheel temporary water supplies through these interties to ensure adequate amounts of water are available to help meet health and safety needs, while minimizing customer curtailments.

BARR Partners have already completed several interties: EBMUD-SFPUC and SFPUC-SCVWD in 2002, and EBMUD-CCWD in 2007. An intertie between EBMUD and Zone 7 is one of the last remaining interties necessary to link all of the agencies associated with the BARR Partnership. This intertie not only provides an essential lifeline for Zone 7 during a catastrophic event (e.g., record drought, earthquake in the Delta, or loss of the South Bay Aqueduct), but also allows Zone 7 to wheel or share regional groundwater and surface water resources with other agencies. The intertie also reduces Zone 7’s reliance on both the State Water Project and diversions from the Sacramento-San Joaquin Delta.

Depends on available grant funding
Drinking Water Supply
Water Quality Improvement
Water Reuse/Recycling
Stormwater Improvements
Groundwater Benefits
Infiltration
Habitat Protection and Restoration
Flood Protection
The intertie between EBMUD and Zone 7 helps the BARR Partnering agencies increase regional water reliability and long-term sustainability by leveraging (i.e., allow wheeling and exchanges of 10 to 25 MGD, or 11,200 to 28,000 AF annually) of existing groundwater and surface water resources to meet regional needs. The project also provides a vital lifeline to Zone 7 Water Agency during a catastrophic loss of the Delta or the South Bay Aqueduct due to record drought or major earthquakes. The intertie also reduces Zone 7’s reliance on the State Water Project and/or diversions from the Sacramento-San Joaquin Delta.
This project will complete one of the last remaining components necessary to help address long-term drought and emergency preparedness by providing treated water deliveries to numerous water agencies and cities in the Bay Area, particularly, as it is one of many transfer points for water supply exchanges between the five largest water agencies in the Bay Area. Increasing the number of transfer points enhances inner-agency connections, which will encourage the efficient use of water supplies on a regional basis. Additionally, this intertie will be available to provide water to Bay Area agencies during a natural disaster, emergency, or extended system shutdown; thereby, improving the water supply reliability for the entire region.
Land use planning requires assurances that water supplies are available and reliable for existing and future customers. This project enhances water supply reliability by integrating the management of drinking water supplies between the two agencies, while facilitating exchanges and transfers between the Bay Area's five larges water agencies. EBMUD, due to its location in the Bay Area, is critical for delivering water supplies to neighboring water districts, specifically Zone 7. For example, supplies from this EBMUD/ZONE 7 intertie can be delivered to SFPUC and then to SCVWD or the Bay Area Water Supply and Conservation Agency (BAWSCA) members, or to CCWD through a new treated water intertie with EBMUD. As a result of this project, land use planning efforts throughout the Bay Region have improved water supply reliability.
This project could lead to additional partnerships with three other water agencies (CCWD, SFPUC, and SCVWD) that would improve regional water supply reliability during a catastrophic event (e.g., earthquake).
Yes.

Part 2 - Detail

The Bay Area’s major water agencies are working together to develop a regional solution to improve the water supply for over 6 million residents and thousands of businesses and industries. This Bay Area Regional Reliability (BARR) Partnership includes Alameda County Water District, Contra Costa Water District, East Bay Municipal Utility District, Santa Clara Valley Water District, San Francisco Public Utilities Commission, and Zone 7 Water Agency.

Interties to Leverage Existing Bay Area Infrastructure for Drought, Emergencies, and Climate Change

A critical need identified by the BARR Partnership is to work cooperatively to inter-connect their water systems with interties to leverage existing facilities and, if needed, build new ones (e.g., desalination, infiltration, treatment, or storage) to bolster regional water supply reliability to protect against droughts and emergencies, while preparing for climate change. For example, after disruptions in regular water supply sources or during planned outages of critical systems, the BARR Partnership could wheel temporary water supplies through these interties to ensure adequate amounts of water are available to help meet health and safety needs, while minimizing customer curtailments.

Essential Intertie: EBMUD/Zone 7 Regional Reliability Intertie

BARR Partners have already completed several interties: EBMUD-SFPUC and SFPUC-SCVWD in 2002, and EBMUD-CCWD in 2007. An intertie between EBMUD and Zone 7 is one of the last remaining interties necessary to link all of the agencies associated with the BARR Partnership. This intertie not only provides an essential lifeline for Zone 7 during a catastrophic event (e.g., record drought, earthquake in the Delta, or loss of the South Bay Aqueduct), but also allows Zone 7 to wheel or share regional groundwater and surface water resources with other agencies. The intertie also reduces Zone 7’s reliance on both the State Water Project and diversions from the Sacramento-San Joaquin Delta.

Project Components

This project will construct a 10 to 25 million gallons per day (MGD) intertie, including a rate control station, between EBMUD’s East of Hills water system and Zone 7’s water system.

True
Multiple: Bay Area Regional Reliability Interties, Bay Area Regional Desalination

2011 Water Supply Evaluation - http://www.zone7water.com/2011-water-supply-evaluation

Bay Area Regional Desalination Project - http://www.regionaldesal.com/

DRAFT Technical Memorandum, Zone 7/EBMUD Potential Emergency Intertie and Conjunctive Use Projects, Preliminary Evaluation. April 14, 2003. Available upon request.

 

The intertie between EBMUD and Zone 7 helps the BARR Partnering agencies increase regional water reliability and long-term sustainability by leveraging (i.e., allow wheeling and exchanges of 10 to 25 MGD, or 11,200 to 28,000 AF annually) of existing groundwater and surface water resources to meet regional needs. The project also provides a vital lifeline to Zone 7 Water Agency during a catastrophic loss of the Delta or the South Bay Aqueduct due to record drought or major earthquakes. The intertie also reduces Zone 7’s reliance on the State Water Project and/or diversions from the Sacramento-San Joaquin Delta.

If this project is not implemented, then the six largest Bay Area water agencies would not be able to coordinate water supply management during catastrophic events or develop future water supplies to help improve regional water supply reliability. Additionally, Zone 7 will continue to be reliant on only two sources of supply during a catastrophic event (e.g., earthquake in the Delta or loss of the South Bay Aqueduct), and EBMUD's southeastern service area would not have access to additional sources of supply during a similar event.

A critical need identified by the BARR Partnership is to work cooperatively to inter-connect their water systems with interties to leverage existing facilities and, if needed, build new ones (e.g., desalination, infiltration, treatment, or storage) to bolster regional water supply reliability to protect against droughts and emergencies, while preparing for climate change. For example, after disruptions in regular water supply sources or during planned outages of critical systems, the BARR Partnership could wheel temporary water supplies through these interties to ensure adequate amounts of water are available to help meet health and safety needs, while minimizing customer curtailments.

 

BARR Partners have already completed several interties: EBMUD-SFPUC and SFPUC-SCVWD in 2002, and EBMUD-CCWD in 2007. An intertie between EBMUD and Zone 7 is one of the last remaining interties necessary to link all of the agencies associated with the BARR Partnership. This intertie not only provides an essential lifeline for Zone 7 during a catastrophic event (e.g., record drought, earthquake in the Delta, or loss of the South Bay Aqueduct), but also allows Zone 7 to wheel or share regional groundwater and surface water resources with other agencies. The intertie also reduces Zone 7’s reliance on both the State Water Project and diversions from the Sacramento-San Joaquin Delta.  

 

True
False
False
Increases Water Supply Reliability
Advances/ Expands Conjunctive Management of Multiple Water Supply Sources
Increases Water Use and/or Reuse Efficiency
Provides Additional Water Supply
Promotes Water Quality Protection
Reduces Water Demand
Advances/Expands Water Recycling
Promotes Urban Runoff Reuse
Addresses Sea Level Rise
Addresses other Anticipated Climate Change Impact (e.g. through water management system modifications)
Improves Flood Control (e.g. through wetlands restoration, management, protection)
Promotes Habitat Protection
Establishes Migration Corridors
Re-establishes River-Floodplain Hydrologic Continuity
Re-introduces Anadromous Fish Populations to Upper Watersheds
Enhances and Protects Upper Watershed Forests and Meadow Systems
Other (Please Describe)
Increases Water Use Efficiency or Promotes Energy-Efficient Water Demand Reduction
Improves Water System Energy Efficiency
Advances/Expands Water Recycling
Promotes Urban Runoff Reuse
Promotes Use of Renewable Energy Sources
Contributes to Carbon Sequestration (e.g. through vegetation growth)
Other (Please Describe)
(low) - (high)
Drought Preparedness
Use and Reuse Water More Efficiently
Climate Change Response Actions (Adaptation to Climate Change, Reduction of Greenhouse Gas Emissions, Reduce Energy Consumption)
Expand Environmental Stewardship
Practice Integrated Flood Management
Protect Surface and Groundwater Quality
Improve Tribal Water and Natural Resources
Ensure Equitable Distribution of Benefits
Reduce Reliance on the Bay-Delta
Reduce Water Demand
Improved Operational Efficiency and Transfers
Increase Water Supply
Improve Water Quality
Improve Flood Management
Practice Resources Stewardship
Other Strategies (Please Describe)
Groundwater Management Plan
Urban Water Management Plan
Water Meter Requirements
Groundwater Monitoring Requirements
AB 1420 Compliance
BMP Compliance
CEQA Compliance
Water supply reliability, water conservation and water use efficiency
Stormwater capture, storage, clean-up, treatment, and management
Removal of invasive non-native species, the creation and enhancement of wetlands, and the acquisition, protection, and restoration of open space and watershed lands
Non-point source pollution reduction, management and monitoring
Groundwater recharge and management projects
Contaminant and salt removal through reclamation, desalting, and other treatment technologies and conveyance of reclaimed water for distribution to users
Water banking, exchange, reclamation and improvement of water quality
Planning and implementation of multipurpose flood management programs
Watershed protection and management
Drinking water treatment and distribution
Ecosystem and fisheries restoration and protection
Reduced Reliance on the Bay-Delta
Projects that directly address a critical water quality or supply issue in a DAC
Urban water suppliers implementing certain BMPs as on page 17 of Guidelines
Be designed to manage stormwater runoff to reduce flood damage (PRC §5096.827)
Be consistent with the applicable Regional Water Quality Control Plans (Basin Plans) (PRC §5096.827)
Not be a part of the State Plan of Flood Control (SPFC) (PRC §5096.827)

Project team

Part 3 - Benefits