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


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


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


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


About Zone 7: Water Facilities

DV WTP40 mgd

PP WTP19 mgd

SBA

WELLS40 mgd

DoughertyReservoir


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


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


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 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


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


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


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


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


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


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


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


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


Mocho Demineralization Plant




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


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)


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

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.

Documents

salt management plan

salt management plan

salt management plan

salt management strategy

s salt management plan

salt balance

recycled water slide

water agency slide