Zone 7 Water Agency Zone 7’s Salt Management Plan Past, Present & Future May 9, 2012 Kurt Arends, P.E. AGM Engineering and Operations Zone 7 Water Agency.

Zone 7 Water Agency

Zone 7’s

Salt Management PlanPast, Present & Future

May 9, 2012

Kurt Arends, P.E.AGM Engineering and OperationsZone 7 Water Agency

Salt Management Plan History May 2012

Presentation Outline

• Who is Zone 7 Water Agency

• Existing Salt Management Plan

• Challenges

• SMP Outcome

• Implementation progress

• Current SMP efforts

Salt Management Plan History May 2012

About Zone 7: Service Area

Delta

Dublin

San Ramon

Pleasanton

LivermoreDSRSD

Pleasanton

Livermore

Cal Water

• Service Area: 430 mi2

• Wholesale water to approx. 220,000 residents in Dublin, Pleasanton, Livermore and the parts of San Ramon

• Service to four retailers

• 3,500 acres of Agricultural

• Groundwater Basin Manager

• Regional Flood protection for Eastern Alameda County

Salt Management Plan History May 2012

Who is Zone 7?

Average Surface Water Supply:

87% of Supply viaSouth Bay Aqueduct

13% of Supply viaArroyo del Valle

Arroyo Valle

South Bay Aqueduct

Salt Management Plan History May 2012

Who is Zone 7?

Groundwater:

Groundwater BasinManager

(over 40 years)

126,000 acre-feetof Operational

Storage

Current SustainableYield: 13,400 acre-feet

Arroyo Mocho

Arroyo Valle

Arroyo Las

Positas

Salt Management Plan History May 2012

About Zone 7: Water Facilities

DV WTP40 mgd

PP WTP19 mgd

SBA

WELLS40 mgd

DoughertyReservoir

Salt Management Plan History May 2012

Challenges in early 1990s

• Additional water supply needed to meet projected demands

• Need to expand wastewater export capacity

Zone 7 and the two wastewater management agencies co-sponsored a Water Recycling Study

Salt Management Plan History May 2012

Water Recycling Study -1992

• Zone 7, City of Livermore and Dublin San Ramon Services District Completed the Study

• Recognized recycled water as a viable source

• Recognized need to protect the Groundwater Basin Water Quality

• Master Water Recycling Permit from RWQCB

• Master Permit required Salt Management Plan

Salt Management Plan History May 2012

Sources of Salt

• Stream inflows

• Subsurface groundwater inflow from fringe basins

• Urban and Agricultural Irrigation with imported water

• Adding Irrigation with Recycled Water

Salt Management Plan History May 2012

Salt Management Plan Process (1994-1999)

• Zone 7 was Lead Agency

• Developed through a collaborative process

• Formed a Technical Advisory Group

• Groundwater Management Advisory Committee

• Data compilation, analysis and presentations 1994 through 1999

• In 1999, Zone 7 Board approved a Salt Management Strategy

Salt Management Plan History May 2012

Challenges during the SMP development (1994-99)

• Technical challenges

– Mass balance approach

– How to Include All Salt Sources

• Economic Challenges/Who should pay?

– Users over the Main Basin vs outside the Main Basin

– Existing users vs future users

– Result: Groundwater Basin beneficiaries should pay

Salt Management Plan History May 2012

Challenges during the SMP development (1994-99)

• Other challenges

– Implementation impacts and benefits

o water rates

o delivered water quality

– Growth vs no growth

• TAG and GMAC helped formulate policy goals and recommendations to our Board

Salt Management Plan History May 2012

Adopted SMP Policy Goals -1999

• Mitigate existing and future salt loading

• Maintain or Improve delivered water Quality

• Provide comparable delivered water quality to all retailers

• Provide a mechanism to offset salt loading associated with recycled water use

• Minimize O&M cost through adaptive management process & long term goals

Developing Policy goals helped screen salt management strategies

Salt Management Plan History May 2012

Analyzed SMP Strategies

• Increased conjunctive Use (The Core Strategy)

• Wellhead Demineralization w/ brine export

• Demineralize Recycled water and Inject into GW Basin – Failed due to public opposition

• Delta Fix - lower TDS import water (may improve

salt balance but not in Zone 7 control)

• High TDS GW export via streams – Failed due to potential downstream impacts

Salt Management Plan History May 2012

Zone 7 Board Approval and Implementation

• In August 1999 Zone 7 Board approved SMP

– Increased conjunctive use with wellhead demineralization

• Strategy:

– Mitigate existing and future salt loading

– Maintain or Improve delivered water quality

– Annual salt management decisions made through operations planning to provide flexibility to minimize cost and achieve long term goal

Salt Management Plan History May 2012

RWQCB Approval of SMP and Water Recycling

• In June 2004, the Three co-permittees submitted the Salt Management Plan for RWQCB approval

• In September 2004, RWQCB Approved the SMP

Salt Management Plan History May 2012

SMP Implementation Progress

• Initiated increased conjunctive use in 2000

• In 2003 Initiated the planning and permitting for

Wellhead Demineralization Facility

• In 2005 prepared GWMP for the Basin and incorporated the 2004 SMP by reference

Salt Management Plan History May 2012

SMP Implementation Progress

• In 2009 Wellhead Demineralization Facility came online

– 6.1 MGD permeate, 1.5 MGD brine– Capital Cost ~$36M and O&M cost ~$1.5M/year– Up to 3,000-4,000 tons net salt removed/year

• Full SMP Implementation needs additional recharge capacity

– Use of Chain of Lakes after 2030

Salt Management Plan History May 2012

Mocho Demineralization Plant

Mocho Demineralization Plant

Salt Management Plan History May 2012

Mocho Demineralization Plant

Produces 6.1-million gallons per day of permeate water by Reverse Osmosis to be blended with bypass GW

Salt Management Plan History May 2012

Recent SMP Related Developments

• In 2009, SWRCB Issued Recycled Water Use Policy requiring

– Basins with Recycled water to have an approved SMP by May 2014

– SMPs to include Nutrient Management plans and CEC Monitoring plans

• Zone 7 has RWQCB approved SMP (since 2004)

Salt Management Plan History May 2012

Recent SMP Related Developments

• Zone 7 SMP needs amendment to include

– Nutrient Management Plans

– Monitoring plan for CEC

– GW Basin Recharge area map

• Plans to amend the SMP by January 2014

– Working with RWQCB and other sister agencies

– Held workshop with RWQCB and agencies

– Coordinating with agencies on consistent approach