CC 2021-11-23 Water Alternatives Study_PP PresentationWater Supply Alternatives Study Update
City of Arroyo Grande
Presenter:
JJ Reichmuth, PE
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Objectives of Study
Summarize previous studies
Document efforts implemented since 2004 Water Supply Alternatives Study Report
Provide preliminary list of available water options
Identify the most promising options
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Supplemental Water Needs
City water supplies include Lopez Water, Santa Maria Valley Groundwater Basin (groundwater), and Pismo Formation (groundwater)
2020 water demand was 24% lower than predicted
City has sufficient water through buildout per 2015 UWMP
However, securing 250 AFY would reduce groundwater usage and further protect the basin
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Summary of 2004 Study
Short term alternatives (within 5-year period)
Intermediate alternatives (over 10-year period)
Long-term alternatives (10-15-year timeframe)
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Update to 2004 Study
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Update to 2004 Study
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2021 Water Supply Alternatives
State Water
Oceano CSD
Interagency Connections
Nacimiento Water Project
Central Coast Blue
Recycled Water “Scalping Plant” Concept
Stormwater Capture
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Oceano CSD
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State Water
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Interagency Connections
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Nacimiento Water
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Central Coast Blue
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Recycled Water “Scalping Plant” Concept
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Stormwater Capture
SLO County Stormwater Resource Plan (2020) identified opportunities to capture stormwater and dry weather runoff.
Benefit of 26 AFY identified across five projects among Arroyo Grande, Pismo Beach, Grover Beach, Oceano, and other local areas.
Total cost cannot be determined at this time.
Low benefit across the entire area
Projects could be pursued as new development occurs or existing basins are upgraded in future
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The recommended short term alternatives are:
Partner with OCSD on a short-term water supply agreement:
A temporary agreement would be required.
Purchasing OCSD water as a permanent supply could be affected by OCSD and City regulations.
OCSD has been able to enter into short-term agreements in the past for sale of their State Water entitlement.
Ballot measure in 2016 - allows the City to purchase State Water on an emergency basis.
Purchasing State Water under non-emergency conditions would require a new ballot measure to be passed.
Recommended Alternatives
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Pursue an emergency connection with Golden State Water Company:
The City’s water service area is located within 300 feet of GSW water infrastructure.
Both the City and GSW are CalWARN members, which promotes mutual aid during water emergencies, and could help the development of an emergency interconnection;
A water supply interconnection could benefit the City, GSW and NCSD to allow transfer of water from Lopez Project contractors through the City’s water system;
Further negotiations, analysis of cost infrastructure and maintenance and operation are required.
Recommended Alternatives cont’d
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The recommended long term alternative is:
Continue participation in Central Coast Blue:
The City anticipates purchasing 25% of the water produced by the CCB project.
Pismo Beach City Council unanimously approved increasing its share of the Project from 20% to 39%, leaving no portion of the Project unsubscribed.
The Cities of Arroyo Grande, Grover Beach, and Pismo Beach are preparing agreements to address cost sharing and operations of the Project.
In light of the City’s pursuit of the CCB Project, staff recommends prioritizing it as the main source of additional permanent water supply.
Recommended Alternatives cont’d
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Next Steps
Each of these alternatives, if pursued, will require:
- additional and more detailed evaluation of design/infrastructure, permit requirements, cost analysis, and a framework for agreements/negotiations with agencies and/or private property
owners.
It is recommended by staff that:
- each of the three alternatives listed above are evaluated further and pursued to the preliminary negotiation and agreement stage.
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Next Steps
Continue engagement in Central Coast Blue. Pursue exchange of recycled water for Lopez and/or State Water
Initiate MOU with GSWCR for emergency interconnection
Begin initial discussions with GSWCR and NCSD for purchase of excess supplemental water
Negotiate with OCSD on temporary water supply agreement and explore long-term water purchase separately
Approach potential agricultural customers to discuss exchange of recycled water for reduced pumping (“Scalping Plant” Concept)
Continue to engage with County staff in case Nacimiento or State Water is available in future.
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Questions?
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Recommended Alternatives
Short Term
Partnering with OCSD
Pursuing emergency connection with GSWCR
Long Term
Participation in Central Coast Blue
Negotiation with OCSD for long-term water purchase
Negotiation with GSWCR and NCSD for supplemental water after emergency GSWCR connection is pursued
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