Water Advisory Committee of Orange County June 7, 2013

Water Advisory Committee of Orange County

June 7, 2013

Background

System Reliability

Diemer Plant Reliability

Conveyance and Distribution System Reliability

Seismic Vulnerability Study

Special district of the State of California

Formed in 1928, under authority of MWD Act

Primary purpose: provide supplemental water at

wholesale rates to its member agencies

26 member public agencies

14 cities

11 municipal water districts

one county water authority

COLORADO RIVER AQUEDUCT LOCAL GROUNDWATER METROPOLITAN WATER DISTRICT SERVICE AREA LOS ANGELES AQUEDUCTS LAKE OROVILLE Bay-Delta STATE WATER PROJECT LAKE SHASTA

MWD Service Area

Six-County Service Area:

5,200 square miles

Population: 19 million

Gross Domestic Product:

$1 Trillion

Projected growth:

~220,000 people/year

MWD provides 40 to

60 percent of

Southern California’s

water supply

The mission of the Metropolitan Water District of

Southern California is to provide its service area with

adequate and reliable supplies of high-quality water to

meet present and future needs in an environmentally

and economically responsible way.

System Capacity Water Supply

Infrastructure Reliability

Emergency Response

MWD service connections with full backup capability

Water Treatment Plants

87% (299) of MWD’s service connections have full backup capability

Treatment Plants

MWD service connection demands without backup capability

> 20 cfs 5 to 20 cfs < 5 cfs

Water Treatment Plants

17% (45) of MWD’s service connections have limited or no backup capability

Infrastructure Reliability Maintenance Management Program Infrastructure Protection Plan Special Investigations/ Condition Assesments Vulnerability Assessments Routine Monitoring, Inspection & Maintenance CMMS (Maximo)

Water System Operations (WSO) Engineering Service Group (ESG)

Is designed to maintain our facilities in a state of readiness

to ensure system deliveries

Major Rehabilitation, Replacement and Upgrade Projects (Since 2001)

Containment Plant Maintenance _Facility

66 KV Sub

Station Vehicle Maintenance _Center

Completed

Yorba Linda Power Plant Modifications Electrical System Improvements Chemical System Upgrades On-going Filter Valve Replacement Up-coming Basin Rehabilitation

Diemer North Access Road Valley View Avenue CHSP Discovery Ctr Carbon Canyon Road

Emergency road to Diemer WTP

Access to main plant’s

facilities, lagoons and

pipelines

Improved security

Fire break

Evaluate vulnerability to hazards

Seismic events Flooding

Vehicle impact

Assess impact to facility operation

Propose mitigation options

Hydraulic surge Equipment failure Fire

Example: Electrical Reliability Improvements

Provide new 66kV power supply from Edison (completed) Provide critical systems with dual power sources

Upgrade emergency generators Upgrade grounding system

Replace obsolete equipment

66 Kv Transmission Towers 66 kV sub-station

East WW Tank Seismic Upgrade

FWR Seismic Upgrade

South West Pad Stabilization WWRP #2 Slope Stabilization ORP Site Preparation West WW Tank Seismic Upgrade

Filter Outlet Conduit Seismic Upgrade Filter Bldgs

Seismic Upgrade

Admin Bldg Seismic Upgrade

Entrance Fill Slope Stabilization Design / Construction On-Going Study Completed North Slope Remediation

Benching of Native Soil RCC Placement

In a major seismic event

Concrete cracking could occur

Foundation caissons may displace outward Extended shutdown required for repairs Reservoir would remain intact

Fill Bedrock Colluvium New Retaining Wall Thicken Floor Slabs Caissons

New Retaining Wall Thicken Floor Slab

Seismic Retrofit

Install new retaining wall

Thicken 3 sections of slab

In a major seismic event:

Soil below tank could

slide & leave voids

under tank

Foundation caissons

could rotate & shear

Risk to tank foundation

Bedrock Foundation Caissons New Retaining Wall Tank Section

Seismic Retrofit & Upgrades

Install new shear walls & plates

Recoat tank

New Retaining Walls

Finished Water Reservoir

Anchor bolts and plates installed at base to transfer seismic forces to foundation

Ozone Facilities

ORP Ozone Generators Contactors Building

Capital Investments

Other 12 18

Projects Going Forward

Seismic Upgrades ($33 M)

Filter Outlet Conduit $ 11.5 M

Administration Building 6.6 M

Finished Water Reservoir South Slope 5.5 M & East Washwater Tank

Filter Buildings No. 1 & 2 9.4 M

Infrastructure Improvements ($136 M)

Basin Rehabilitation $ 50.2 M

Electrical Improvements 30.2 M

Filter Valve Refurbishment 26.0 M

Washwater Reclamation Plant 13.6 M

Chemical Feed System Improvements 4.5 M

Chemical Tank Farm Improvements 1.8 M

Other 9.7 M

Other ($18M)

Total pipeline length = 830 miles PCCP 163 mi Other 79 mi Steel 354 mi Reinf. Conc. 234 mi

Cross Section

60-inch Diameter PCCP

Concrete Encasement Disturbed Soil Crack

PCCP

Broken Back

Inspections initiated in 2000

Visual - broken back cracks

Electromagnetic – broken prestressing wires 3rd _{set of inspection (5 year cycle)}

Stray Current Testing

Surveyed every 1 to 2 years

Repairs completed on individual distressed pipe

segments

99.1% No Wirebreaks

0.6% Repaired

0.3% Wirebreaks; continue monitoring

PCCP Lines

All Other Distribution Lines

ORANGE COUNTY SERVICE AREA

Robert B. Diemer Water Treatment

Plant

Allen McColloch Pipeline 2nd _{Lower Feeder}

Irvine Cross Feeder Yorba Linda Feeder

Pipeline Repaired

Length (ft) Repair Dates

Total Repair Costs Allen-McColloch Pipeline 831 1999, 2002, 2003, 2010,

2012 $11,381,141 Auld Valley Pipeline &

San Diego Pipeline No. 4 90 2004, 2012 $560,000 Box Springs Feeder 491 2003,2007,2011 $6,642,491 Calabasas Feeder 520 2010, 2005, 2011 $5,012,678 Foothill Feeder 60 2007, 2012 8,865,637 Lake Skinner Outlet Conduit

& San Diego Pipeline No. 5 166 2010, 2006 $5,176,612 Rialto Pipeline 255 2004, 2005, 2006, 2007 $12,309,508 Second Lower Feeder 4,620 2002, 1996, 2011 $6,850,000 Sepulveda Feeder 321 2008, 2006, 1998, 1995,

1978 $6,919,083 West Valley Feeder No.1 240 2006 989,000

Infrastructure Rehabilitation and Replacement Projects

Expenditures (FY01/02 to FY11/12)

OC-88 Pump Station Improvements $ 14.6 M

Allen-McColloch Pipeline Repairs 11.4

Service Connection Improvements 1.0

EOCF No. 2 – Pressure Relief Structure 0.9

Other 2.6

Total $ 30.5 M

Planned/In Progress (FY12/13 to FY16/17)

Orange County Feeder Relining $ 36.0 M

Distribution System Infrastructure Protection 5.2 Orange County C&D Electrical Improvement 3.4 Allen-McColloch Stray Current Drain Station 1.3

Other 7.2

Assessment

Assess access, erosion, security issues Review right-of-way encroachments

Recommend infrastructure improvements & R/W

Regional Environmental Documentation & Permitting

Programmatic EIR

Resource agency permitting Program-wide mitigation

Improvements

Right-of-way resolution Acquisitions

Design & construction

Program Implemented 3 Phases

6 regions (Orange, West San Bernardino, Los Angeles. Riverside, San Diego, Colorado River Aqueduct)

Diemer Plant Allen-McColloch Pipeline Santiago Lateral Lower Feeder East OC Feeder No.2 Orange County Feeder 2nd _Lower Feeder Lower Feeder West OC Feeder East OC Feeder No.1

Distribution System Infrastructure Protection

Access Road

near Mud

Canyon

Erosion Over

Lower Feeder

Lower Feeder

Alignment

Santiago

Lateral

Access Road

Metropolitan

right-of-way

_{Portion of pipeline}

outside of

right-of-way

2008 USGS Study

97% probability of an earthquake of Magnitude 6.7

or greater in So. California within the next 30 years

37% probability of an earthquake of Magnitude 7.5 or

greater in So. California within the next 30 years

San Andreas Fault

Potential Effects of So Cal Seismic Events on MWD Deliveries

Task 1

Identify Seismic Faults

Task 2

Estimate Earthquake Damage + Time to Restore Service

Task 3

Assess Impacts on Water Delivery

Task 4

High-Level Estimated Outage Durations

Facility Earthquake Moderate (M 6.7)

Extreme Earthquake

(> M7.0)

MWD - CRA 1 month 6 months

DWR Up to 6 months 6 + months

MWD - Conveyance &

Distribution to 2 months 1 week to 3 months 1 week MWD – Treatment Plants Up to 1 month Up to 6 months

Impacts on Diemer Water Service Area

Fault Components Damaged

Estimated Repair

Duration _{Conclusions *}

Diemer Pipelines Whittier

(M 7.2)

Diemer Water Treatment Plant Yorba Linda Feeder

Lower Feeder (Raw Water)

Up to 6 months months 1 to 2 Regional and Local Flexibility Important Peralta Hills (M 6.7)

Diemer Water Treatment Plant East OC No. 2

AMP 1 week 1 week to 1 month

Local Flexibility Important * Regional Flexibility / Emergency Response

Partial backup from common pool area (Jensen) Raw water bypass capability at Diemer

Upgraded emergency response capabilities

* Local Flexibility

Reliability Projects (e.g., Baker WTP, Upper Chiquita Reservoir) Member agency interconnections

The “unthinkable” occasionally happens

2011 Great East Japan Earthquake and Tsunami 2011 Christchurch, New Zealand earthquakes

Vulnerability Study

Re-evaluate potential impact of extreme seismic events on water delivery capability

CRA

Tunnels

Conveyance and Distribution System

Continue to coordinate with DWR on seismic

assessment of the California Aqueduct