Water Advisory Committee of Orange County June 7, 2013

Transcription

1 Water Advisory Committee of Orange County June 7, 2013

2 Background System Reliability Diemer Plant Reliability Conveyance and Distribution System Reliability Seismic Vulnerability Study Next Steps

3 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 Governed by 37-member Board of Directors

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

5 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

6 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.

7 Water Supply System Capacity Emergency Response Infrastructure Reliability System Flexibility

8 Water Treatment Plants 87% (299) of MWD s service connections have full backup capability MWD service connections with full backup capability

9 Treatment Plants Water Treatment Plants <10 cfs 17% (45) of MWD s service connections have limited or no backup capability 117 cfs 0 cfs 107 cfs MWD service connection demands without backup capability > 20 cfs 5 to 20 cfs < 5 cfs 119 cfs 310 cfs

10 Is designed to maintain our facilities in a state of readiness to ensure system deliveries Infrastructure Reliability Maintenance Management Program Infrastructure Protection Plan Routine Monitoring, Inspection & Maintenance CMMS (Maximo) Special Investigations/ Condition Assesments Vulnerability Assessments Water System Operations (WSO) Engineering Service Group (ESG)

11 Whittier Fault

12 Major Rehabilitation, Replacement and Upgrade Projects (Since 2001) Completed On-going Up-coming North Access Road Chlorine Containment Plant Maintenance Facility Basin Rehabilitation Chemical System Upgrades Thickeners Yorba Linda Power Plant Modifications 66 KV Sub Station Solids Handling Vehicle Maintenance Center Filter Valve Replacement Electrical System Improvements New Plant Entrance

13 Emergency road to Diemer WTP Access to main plant s facilities, lagoons and pipelines Improved security Fire break Carbon Canyon Road CHSP Discovery Ctr Diemer North Access Road Valley View Avenue

14 Construction

15 Evaluate vulnerability to hazards Seismic events Flooding Vehicle impact Hydraulic surge Equipment failure Fire Assess impact to facility operation Propose mitigation options

16 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 sub-station equipment 66 Kv Transmission Towers

17 North Slope Remediation WWRP #2 Slope Stabilization Filter Bldgs Seismic Upgrade Filter Outlet Conduit Seismic Upgrade East WW Tank Seismic Upgrade Admin Bldg Seismic Upgrade FWR Seismic Upgrade Completed Design / Construction On-Going Study West WW Tank Seismic Upgrade ORP Site Preparation Entrance Fill Slope Stabilization South West Pad Stabilization

18 Benching of Native Soil RCC Placement Stabilized South Slope Ozone Buildings

19 In a major seismic event Concrete cracking could occur Foundation caissons may displace outward Extended shutdown required for repairs Reservoir would remain intact Thicken Floor Slabs Fill Colluvium New Retaining Wall Bedrock Section of South Wall Caissons

20 New Retaining Wall Thicken Floor Slab Seismic Retrofit Install new retaining wall Thicken 3 sections of slab

21 In a major seismic event: Soil below tank could slide & leave voids under tank Foundation caissons could rotate & shear Risk to tank foundation New Retaining Wall Fill Bedrock Foundation Caissons Tank Section

22 Finished Water Reservoir New Retaining Walls Seismic Retrofit & Upgrades Install new shear walls & plates Recoat tank

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

24 Ozone Facilities ORP Ozone Generators Contactors Building ORP LOX Tank Farm

25 Category Capital Investments Expenditures FY 01/02 to FY 11/12 ($M) Planned FY 12/13 to FY 16/17 ($M) Seismic Upgrades $ 87 $ 33 Infrastructure Improvements Oxidation Retrofit Program Other Total $ 522 $ 208

26 Projects Going Forward Seismic Upgrades ($33 M) Filter Outlet Conduit Administration Building Finished Water Reservoir South Slope & East Washwater Tank Filter Buildings No. 1 & 2 Infrastructure Improvements ($136 M) Basin Rehabilitation Electrical Improvements Filter Valve Refurbishment Washwater Reclamation Plant Chemical Feed System Improvements Chemical Tank Farm Improvements Other Other ($18M) Yorba Linda Power Plant Modifications $ 11.5 M 6.6 M 5.5 M 9.4 M $ 50.2 M 30.2 M 26.0 M 13.6 M 4.5 M 1.8 M 9.7 M $ 18.0 M

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

29 Cross Section Prestressed Steel Wires Mortar Coating Broken Prestressing Wires Concrete Core Mortar Lining Steel Cylinder

30 60-inch Diameter PCCP

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32 Concrete Encasement Crack PCCP PCCP Broken Back Disturbed Soil

33 Inspections initiated in 2000 Visual - broken back cracks Electromagnetic broken prestressing wires 3 rd set of inspection (5 year cycle) Stray Current Testing Surveyed every 1 to 2 years Repairs completed on individual distressed pipe segments Collaboration w/ PCCP owners & AWWA

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35 2 nd Lower Feeder Robert B. Diemer Water Treatment Plant PCCP Lines All Other Distribution Lines Yorba Linda Feeder ORANGE COUNTY SERVICE AREA Allen McColloch Pipeline 99.1% No Wirebreaks 0.6% Repaired Irvine Cross Feeder 0.3% Wirebreaks; continue monitoring

36 Pipeline Repaired Length (ft) Allen-McColloch Pipeline 831 Auld Valley Pipeline & San Diego Pipeline No. 4 Repair Dates 1999, 2002, 2003, 2010, 2012 Total Repair Costs $11,381, , 2012 $560,000 Box Springs Feeder ,2007,2011 $6,642,491 Calabasas Feeder , 2005, 2011 $5,012,678 Foothill Feeder , ,865,637 Lake Skinner Outlet Conduit & San Diego Pipeline No , 2006 $5,176,612 Rialto Pipeline , 2005, 2006, 2007 $12,309,508 Second Lower Feeder 4, , 1996, 2011 $6,850,000 Sepulveda Feeder , 2006, 1998, 1995, 1978 $6,919,083 West Valley Feeder No ,000 TOTAL 7,534 $64,706,150

37 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 Total $ 53.1 M

38 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

39 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)

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

41 Distribution System Infrastructure Protection Access Road near Mud Canyon Erosion Over Lower Feeder Lower Feeder Alignment

42 Access Road Santiago Lateral

43 Metropolitan right-of-way Portion of pipeline outside of right-ofway

44 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

45 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 San Andreas Fault Task 4 Identify Potential Mitigation

46 High-Level Estimated Outage Durations Facility Moderate Earthquake (M 6.7) Extreme Earthquake (> M7.0) MWD - CRA 1 month 6 months DWR Up to 6 months 6 + months MWD - Conveyance & Distribution 1 week to 2 months 1 week to 3 months MWD Treatment Plants Up to 1 month Up to 6 months

47 Fault Whittier (M 7.2) Peralta Hills (M 6.7) Impacts on Diemer Water Service Area Components Damaged Diemer Water Treatment Plant Yorba Linda Feeder Lower Feeder (Raw Water) Diemer Water Treatment Plant East OC No. 2 AMP Estimated Repair Duration Conclusions * Diemer Up to 6 months 1 week Pipelines 1 to 2 months 1 week to 1 month Regional and Local Flexibility Important 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 Member agency wells

48 The unthinkable occasionally happens 2011 Great East Japan Earthquake and Tsunami 2011 Christchurch, New Zealand earthquakes Disaster planning should consider extreme events

49 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 Continue R&R and seismic upgrade programs

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