Drought Operations

Water Operations Department

August 11, 2015

Water Supply Briefing

• Current Water Supply

•WY15 Drought Operations

•Drought Operations Plan

• Future Water Supply

2

Ernst Schuetz

Current Water Supply Reservoir Storage

3

Total System Storage

365,000 acre-feet (59% of avg, 48% of capacity)

Aug 9, 2015 Average Capacity

WY15 Drought Operations Freeport Regional Water Project

• Coordinated operation – Sacramento County Water Agency

– U.S. Bureau of Reclamation

• 90 million gallons per day

• Plan to deliver 40 TAF of supplemental supply in WY15

4

• State Water Resources Control Board notice posted on April 23, 2015

• Curtailment of post-1914 appropriative right diversions from San Joaquin River watersheds

• Reduced EBMUD storage by 24,000 acre-feet

• Reduced cold water storage for fish habitat preservation

5

WY15 Drought Operations Mokelumne River Curtailment

WY15 Drought Operations Curtailment

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24,000 AF

June 30

7

*Projected storage on September 30, 2015

WY15 Drought Operations Total System Storage Projections

Runoff

Total System Storage*

Without CVP & Transfers

With CVP & Transfers minus

Gainsharing

215 TAF 300 TAF 330 TAF

8

WY15 Drought Operations Estimated Supplemental Water Supplies

Supply

Estimated Quantity (AF)

Total Cumulative

Quantity (AF)

WY2

015 1. CVP Contract – 25% Allocation 33,250 33,250

2. Placer County Water Agency Transfer 7,000 40,250

WY2

016

3. Placer County Water Agency Transfer 5,000 45,250

4. Glenn-Colusa Irrigation District Transfer 0 45,250

5. Sycamore Mutual Water Company Transfer 5,000 50,250

6. Reclamation District 1004 Transfer 8,250 58,500

WY15 Drought Operations Supplemental Supply – Transmission

SACRAMENTO RIVER

MOKELUMNE RIVER

9

10

WY15 Drought Operations Drought Operations Constraints

• Operate water system to meet competing priorities • Manage water system for water supply • Manage water system to comply with Joint Settlement

Agreement requirements for cold water management • Manage reservoirs for water quality

• Taste and Odor Challenges

• Seasonal algae blooms in terminal reservoirs • Significant change in volume in Pardee Reservoir

• Facility issues

• Reverse flows in the Sacramento River • Maintenance and repairs

WY15 Drought Operations Supplemental Supply – Treatment & Distribution

•Deliver water to San Pablo and USL Reservoirs

•Maximize Sobrante and USL Water Treatment Plant production

•Meet all drinking water standards

11

WY15 Drought Operations Treatment Constraints

• Taste and Odor events happen more frequently and are more severe during drought

• Warm weather and poor water quality can lead to algal blooms

• Most of the time, the ozone systems at the treatment plants can handle it

• Increased geosmin levels require reductions in water treatment plant production

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WY15 Drought Operations Supplemental Supply – Treatment & Distribution

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0

50

100

150

200

250

300

350

400

450

500Ja

n-09

Jul-0

9

Jan-

10

Jul-1

0

Jan-

11

Jul-1

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Jan-

12

Jul-1

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Jan-

13

Jul-1

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Jan-

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Jul-1

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Jan-

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Jul-1

5

geos

min

, ng/

L

Raw Water Geosmin, Sobrante Water Treatment Plant

Typical ozone dose is effective up to 50 ng/L.>50 ng/L, extra measures are needed

Peroxide system added

Drought Operations Plan Taste and Odor Management

Short-term

• Ongoing monitoring program

• Adjust chemical doses at plants

• Change inlet gates

• Decrease plant production

Long-term

• Upgrading the ozone systems

• Installing Hypolimnetic Oxygenation System in San Pablo Reservoir

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Drought Operations Plan Taste and Odor Management - Continued

As water levels get lower, options become limited

• Algae live near the surface (sunlight)

• Inlet gate changes are an option when water levels are high enough

• Two inlet gates are needed to lower Pardee Reservoir elevation

• No ozone at the Mokelumne Aqueduct treatment plants (Walnut Creek, Lafayette, Orinda)

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Drought Operations Plan Pardee Reservoir Schematic Cross-Section

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Unit #1 & 2 ~EL375’

Unit #3 & Sluice ~EL260’

Pardee Tower (Mokelumne Aqueduct

Intake)

EL550’ Gate

EL520’ Gate

EL490’ Gate EL460’ Gate

(Not to Scale)

Spillway Crest EL567.7’

MOKELUMNE RIVER

PARDEE DAM

PARDEE RESERVOIR

Drought Operations Plan Pardee Reservoir Schematic Cross-Section

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Unit #1 & 2 ~EL375’

Unit #3 & Sluice ~EL260’

Pardee Tower (Mokelumne Aqueduct

Intake)

EL550’ Gate

EL520’ Gate

EL490’ Gate EL460’ Gate

(Not to Scale)

Spillway Crest EL567.7’

MOKELUMNE RIVER

PARDEE DAM

PARDEE RESERVOIR

Drought Operations Plan WY15 Drought Actions

FREEPORT

CONSERVATION RECYCLING

INTERTIES

Drought Operations Plan Water Supply Management Program (WSMP) 2040

• Identifies and recommends solutions to meet dry-year water needs

• Solution includes conservation, recycling and supplemental supply

19 Year 1 Year 2 Year 3

35 TAF

65 TAF 65 TAF

165 TAF of CVP water over three consecutive years

Drought Operations Plan Drought Stages

Stage 0 1 2 3 4

Demand Reduction

Voluntary 0-15%

Voluntary 0-15%

Mandatory up to 15%

Mandatory >=15%

Supplemental Supplies

Up to 35,000 acre feet

35,000-65,000 acre feet

> 65,000 acre feet

Rates and Charges

Normal rates

Normal rates

Normal rates

+ 8%

drought surcharge

Normal rates

+ 20%

drought surcharge

supersaver

recognition*

excessive use penalty*

Normal rates

+ 25%

drought surcharge

supersaver

recognition*

excessive use penalty*

*Supersaver recognition and excessive use penalty not subject to Prop 218 requirements. 20

Drought Operations Plan Planning for 2016 and 2017

Stage 4 Drought

• Making system improvements to bring in more supplemental supplies from transfers (increase from 65 to 100 TAF)

• Identifying options for future water transfers

• Accelerating improvements to reduce taste and odor issues

• Working collaboratively with the Bureau of Reclamation and our partners

21

Drought Operations Plan Supplemental Supply – Transmission

SACRAMENTO RIVER

MOKELUMNE RIVER

90MGD

35MGD

35MGD 20MGD

10MGD 15MGD

100MGD

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Drought Operations Plan Supplemental Supply Rate of Diversion Improvements

Facility Rate of Diversion (MGD) (TAF)

Briones PP 15 8

Walnut Creek WTP 10 to 20 11

San Pablo WTP 20 to 25 14

Sobrante WTP 35 36

USL WTP 35 36

Total 105 23

Drought Operations Plan San Pablo WTP - Improvements

Project Cost Complete

Repair and Rehabilitate WTP $3.5M Oct. 2015

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Drought Operations Plan New Treatment Test of FSCC Water

• Current Permit specifies conventional water treatment, consistent with plants taking supply from Sacramento river

• Special monitoring characterized FSCC water

quality in 2012, and continues through 2015 • New water treatment study at pilot scale started

in 2014 and finished in 2015 • May result in expansion of treatment plant

options and ability to take full allocation of supplemental supply

• Discussions with DDW underway

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Drought Operations Plan Sobrante WTP - Improvements

Project Cost Complete Reason

Replace Ozone System $12M Mid- 2017 - System Upgrade - Maintain Higher Plant

Production

San Pablo Res. Hypolimnetic Oxygenation System (HOS)

$3.7M Mid- 2018 - Taste and Odor Control - Maintain Higher Plant

Production

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Drought Operations Plan Upper San Leandro WTP

Project Cost Complete Reason

Replace Trac-Vac Solids Removal System

$2.7M Early-2017 - System Upgrade - Maintain Higher

Plant Production

Replace Ozone System $12M Mid-2018 - System Upgrade - Maintain Higher

Plant Production

Solids Handling Improvements $2.0M Early-2018 - Reduce water waste

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Drought Operations Plan Supplemental Supply Rate of Diversion Improvements

San Pablo WTP

Walnut Creek WTP

Briones Reservoir

Existing

20-25 MGD

10-20 MGD

15 MGD

70 MGD

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Future Water Supply 4 Year Storage Decline

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30 TAF Encroachment

300 TAF Deficit

330 TAF (4th lowest)

25 TAF SS 15 TAF Conservation

40 TAF SS

45 TAF Conservation 155 TAF Actions

455 TAF Deficit w/o

Actions

Future Water Supply Total System Storage – as of September 30

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630 TAF 624 TAF

571 TAF

542 TAF

404 TAF

330 TAF

311 TAF 300 TAF

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Future Water Supply Potential for El Nino

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Looking Forward to a Snowy Winter in Water Year 2016!

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Making Plans for a Dry 2016