th annual weftec conference built to last - orange county ......built to last – rehabilitating 5...
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Built to Last – Rehabilitating 5 Miles of Sewer Force Main in Newport Beach, CA
87th Annual WEFTEC Conference
September 30, 2014
Dan Bunce, P.E., PMP and Victoria Pilko, PMP
Orange County Sanitation District (OCSD) BackgroundVictoria Pilko, PMP
OrangeCountyOrangeCounty
Ocean Pipeline
Reclamation Plant No. 1
Treatment Plant No. 2
NewportNewportBeachBeach
FountainFountainValleyValley
Santa AnaSanta Ana
Los Los AlamitosAlamitos
Buena Buena ParkPark
FullertonFullerton
TustinTustin
Garden GroveGarden Grove
La HabraLa HabraBreaBrea
PlacentiaPlacentia Yorba LindaYorba Linda
AnaheimAnaheimAnaheimAnaheim
OrangeOrange
La PalmaLa PalmaCypressCypress
WestminsterWestminster
IrvineIrvine
StantonStantonVillaVillaParkPark
CostaCostaMesaMesa
HuntingtonHuntingtonBeachBeach
SealSealBeachBeach
OCSD Service Area572 miles of sewers200 million gallons per day15 pumping stations2 treatment plants
471 square miles
2.6 million population
21 cities
3 special districts
Wastewater Conveyance Summary
• Full secondary treatment was achieved in 2011 Headwork capacity P1 = 280 MGD,
P2 = 317 MGD Outfall pumping capacity (Long
outfall 480 MGD, Short outfall 240 MGD)
• Disinfection of final effluent began in 2002
• 23 megawatts of power generation - enough to power 20,000 houses
• 750 average wet tons of biosolidsare processed per day
OCSDcollects/treats about 198 million gallons of wastewater every day.
The flow received is about 80% municipal and 20% industrial.
Newport Force Main Project BackgroundVictoria Pilko, PMP
6
Newport FM is a very Critical Element of the OCSD Collection System
Project ChallengesDan Bunce, P.E., PMP
Holistic Rehabilitation was Needed Consequences of Failure are Too High
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Community Impacts
EnvironmentalImpacts
EconomicImpacts
9
Major Businesses Along the Alignment
Bike Community
10
Vehicle, Bike, and Pedestrian Traffic Needed to be maintained
11
Technical Challenges
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Sewer Pressure Cured-in-place-pipe (CIPP ) used for 50% of the Rehabilitation
• Needed to maintain hydraulic capacity
• Full structural solution was required
• Minimize use of corrosive material
• Limited industry experience in Pressure Sewer CIPP Applications
Other Technical Challenges
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Bridge and Deep Storm Drain Crossings required Microtunnel
Hydraulic Constraints
Innovative Solutions NeededDan Bunce, P.E., PMP
Focused Disciplines Needed to Deliver the Innovation• Urban Trench Pipeline Design
• Pressure Sewer Cured-in-Place-Pipe Engineers
• Tunneling Design Engineers
• Geotechnical Engineers
• Groundwater Dewatering Engineers
OCSD called this the “Dream Team”
The Design Team
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Segment Analysis
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Considered Multiple Renewal Solutions
• Trenchless Rehabilitation• Slipline• CIPP
• Tunneling New Pipe• HDD• Microtunnel• Jack & Bore
• Open-cut New
The Innovation Resulted in Key Improvements:• Full Redundant Force Main System
• Public and Worker Safety
• Increased System Reliability
• Reduced Community Impact
• Ease of Maintenance
Built to Last for the Next 50 Years
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#1: Redundancy Built into the System
Step 1:Construct a connection from Lido PS to North Force Main
Step 2:Remove Crossovers and Valves
Step 3:Upsize 4000 ftof South Force Main to eliminate bottleneck
Savings of $2M Net Present value (NPV)
#2: Common Trench Replacement
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• 30 year old HDPE Sliplinedin older VCP Gravity pipe
• Uncertain DR and details on installation
• Pipe was constructed under the sidewalk in front of several businesses and driveways
• Pipe is in close proximity to high pressure gas and water lines
#3: Replacement vs Rehabilitation using Business Case Evaluation
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Existing North Force Main
Alternative 1: Construct a New Pipe in a New Alignment Now
Alternative 2: Defer Construction of New Pipe for 5-10 years
#3: Replacement vs Rehabilitation using Business Case Evaluation
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Approximately $750k in Savings by replacing now Considering Risk Cost
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Consequence of Failure Cost Annualized Risk CostEmergency Response, Isolation and Cleanup
$ 509,600 $ 47,393
Community Disruption $ 100,000 $ 9,300
Potential Fines $ 500,000 $ 46,500
Potential Property Damage/Loss of Business Claims
$ 3,000,000 $ 279,000
Acknowledgements
Additional Core Design Team Members: • Sharon Yin, Project Engineer (OCSD)• Martin Dix, Construction Phase Project Manager (OCSD)• Mark Briggs, Project Design Manager (BC)• Jason Gornall, Senior Pipeline Engineer (BC)• Kelly Derr, CIPP Specialist (BC)• Cherylle Barrido, Specifications and Lead Construction
Support (BC)• Ed Kampbell, CIPP (Jason Consultants)• David Kuan, Traffic Control Engineering, Inc.• Kleinfelder, Geotechnical Engineering• Shannon & Wilson, Groundwater Dewatering Design
Acknowledgements
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Existing North Force Main
Questions ?
Dan Bunce, P.E., PMP and Victoria Pilko, PMP
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