monterey peninsula water supply project presentation june 2012

7/31/2019 Monterey Peninsula Water Supply Project Presentation June 2012

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Monterey Peninsula Water Supply Project -Presentation toMonterey Co. Water Resources Agency

June 25, 2012


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Monterey Peninsula Water Supply Project

Our application before the California Public Utilities

Commission is extensive. To signup for project updates or

view the application, visit our project website:

www.watersupplyproject.org

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Presentation Topics

MPWSP Basics

How GWR fits into our Project

Where are we now

Design of MPWSP Intake System to Minimize Intake of InlandGroundwater

Desalinated Water Supply to SV User

Seawater Intrusion Control Benefits

Reclaimed Water Salinity Control

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MPWSP Basics

Desalination and ASR facilities required to replace partial lossof supplies from Carmel River and Seaside GroundwaterBasin.

5.4 MGD to 9.0 MGD (5,500 to 9,000 AFA) desalination plant,depending on implementation of MRWPCAs GWR project.

Desalination plant to be located near landfill entrance.

13.2 to 22 MGD slant intake system (6 to 8 Wells) on coastline

Brine discharge to MRWPCAs existing outfall

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Role of GWR

Independent Project by MRWPCA

Groundwater Replenishment (GWR) which takes secondarywastewater effluent and processes it through an Advanced

Water Treatment facility is a great opportunity for thePeninsula by:

Lower overall Carbon Footprint

Reduce Loadings to Monterey Bay

Creates vast underground storage reservoir

CAWs desal plant will be sized nearly in half if GWR can be

implemented.

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Where are we now?

Submitted Application to CPUC on April 23, 2012, seekingapproval to design, build and place into rates a 9,006 AFAdesal plant.

Application includes CEQA review by CPUC.

Application also seeks permission to make desal plant smaller(5,506 AFA) if the GWR project can be realized in time. Thedecision to implement GWR will be based on several factors,

including: cost, schedule, and public acceptance.

ALJ expected to issue scoping memo soon which will layoutCPUC schedule.

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Intake being Considered


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Intake Wells

Objectives:

Limit intake of water from inland sources to the extent

practicable

All water taken from beneath the seafloor beyond the shoreline.

Method:

Slant Wells, with screens placed under the seafloor and in 180-

foot formation.

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Slant Well Estimated Depression Contours

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Extensive technical analysis of

the potential effects and

impacts of the slant wells on

local and regional groundwater

conditions in the SVGB was

performed by Geoscience andLuhdorff & Scalmanini as part

of the CEQA review for the

Regional Water

Project. These are two of the

leading groundwater

consulting firms in the State.

CPUC is revisiting as part of

their review of the project.


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Test Slant Well

Currently working on Test Slant Well to be located on Cemexproperty at southern end.

Monitoring wells to be located 200 250 feet north of test

slant well and would be used to verify geology prior toinstallation of slant well.

We will work with MCWRA to develop a comprehensivemonitoring program.

Test well program is needed to gather more information as togeology, salinity, configuration, etc.

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Agency Act & Water Rights

CAW will return 100% of all groundwater captured to theSVGB basin. Proposed action is consistent with Agency Actand California Water Rights Law.

Options for Return to Basin: 1) CSIP

2) Drill injection well on CAW property, and

3) Make available for beneficial use to MCWRA or other party.

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Desalinated Water to be Returned to Basin

Examples:

Assume 9,000 AFA plant capacity

Assume 0% ground water capture (future 2030 condition)

Annual return to be 9,000 * (% GW ) = 0 AFA







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CSIP Impacts if this Return to Basin Option Used

Objectives:

Increase water available to CSIP for agricultural irrigation

Reduce Salinity of CSIP irrigation water

Method: Returning a portion of desalinated water to CSIP will increase

supply and reduce salinity of CSIPs irrigation water

Adjusting salinity of desal supply will reduce salinity of CAWs

combined water supply and reduce the salinity of wastewater

generated by CAWs customers.

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Salinity of Water Supply

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Post Desal


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Existing Salinity

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FOR ILLUSTRATION PURPOSES


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Proposed Salinity

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FOR ILLUSTRATION PURPOSES

with GWR Chlorides ~60mg/l


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Questions

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monterey peninsula water supply project presentation june 2012

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