Built to Last Rehabilitating 5 Miles of Sewer Force Main in Newport Beach, CA September 30, 2014

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1 87 th Annual WEFTEC Conference Built to Last Rehabilitating 5 Miles of Sewer Force Main in Newport Beach, CA September 30, 2014 Dan Bunce, P.E., PMP and Victoria Pilko, PMP

2 Orange County Sanitation District (OCSD) Background Victoria Pilko, PMP

3 OCSD Service Area 572 miles of sewers 200 million gallons per day 15 pumping stations 2 treatment plants 471 square miles 2.6 million population 21 cities 3 special districts Reclamation Plant No. 1 Treatment Plant No. 2 Buena Park La Palma Cypress La Habra Brea Fullerton Anaheim Los Stanton Alamitos Garden Grove Seal Westminster Beach Fountain Valley Huntington Beach Costa Mesa Ocean Pipeline Placentia Santa Ana Newport Beach Tustin Yorba Linda Anaheim Villa Park Orange Irvine Orange County

4 Wastewater Conveyance Summary OCSD collects/treats about 198 million gallons of wastewater every day. The flow received is about 80% municipal and 20% industrial. 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 megawatts of power generation - enough to power 20,000 houses 750 average wet tons of biosolids are processed per day

5 Newport Force Main Project Background Victoria Pilko, PMP

6 Newport FM is a very Critical Element of the OCSD Collection System 6

7 Project Challenges Dan Bunce, P.E., PMP

8 Holistic Rehabilitation was Needed Consequences of Failure are Too High Environmental Impacts Economic Impacts Community Impacts Brown and Caldwell 87th Annual WEFTEC Conference 8

9 Major Businesses Along the Alignment 9

10 Bike Community 10

11 Vehicle, Bike, and Pedestrian Traffic Needed to be maintained 11

12 Technical Challenges 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 Brown and Caldwell 87th Annual WEFTEC Conference 12

13 Other Technical Challenges Bridge and Deep Storm Drain Crossings required Microtunnel Brown and Caldwell 86th Annual WEFTEC Conference 13

14 Hydraulic Constraints

15 Innovative Solutions Needed Dan Bunce, P.E., PMP

16 The Design Team 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 Brown and Caldwell 87th Annual WEFTEC Conference 16

17 Segment Analysis Considered Multiple Renewal Solutions Trenchless Rehabilitation Slipline CIPP Open-cut New Tunneling New Pipe HDD Microtunnel Jack & Bore Brown and Caldwell 87th Annual WEFTEC Conference 17

18 Built to Last for the Next 50 Years The Innovation Resulted in Key Improvements: Full Redundant Force Main System Public and Worker Safety Increased System Reliability Reduced Community Impact Ease of Maintenance Brown and Caldwell 87th Annual WEFTEC Conference 18

19 #1: Redundancy Built into the System Step 2: Remove Crossovers and Valves Step 1: Construct a connection from Lido PS to North Force Main Savings of $2M Net Present value (NPV) Step 3: Upsize 4000 ft of South Force Main to eliminate bottleneck

20 #2: Common Trench Replacement Brown and Caldwell 87th Annual WEFTEC Conference 20

21 #3: Replacement vs Rehabilitation using Business Case Evaluation 30 year old HDPE Sliplined in 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 Existing North Force Main Brown and Caldwell 87th Annual WEFTEC Conference 22

22 #3: Replacement vs Rehabilitation using Business Case Evaluation Alternative 1: Construct a New Pipe in a New Alignment Now Alternative 2: Defer Construction of New Pipe for 5-10 years Brown and Caldwell 87th Annual WEFTEC Conference 23

23 Approximately $750k in Savings by replacing now Considering Risk Cost Consequence of Failure Cost Annualized Risk Cost Emergency 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 Brown and Caldwell 87th Annual WEFTEC Conference 24

24 Acknowledgements

25 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 Existing North Force Main Brown and Caldwell 87th Annual WEFTEC Conference 26

26 Questions? Dan Bunce, P.E., PMP and Victoria Pilko, PMP