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Concept to Construction: Asset Management In Project Design Highline Water District

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Concept to Construction: Asset Management In Project Design Highline Water District

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    1. Concept to Construction: Asset Management In Project Design Highline Water District Matthew J. Maring, P.E. AWWA PNWS Conference May 1, 2008

    2. Initial Project Design Concept Transmission Capacity Improvements 4600’ 16” Diameter Mains Dead-End Main Looping Improvements 6500’ 8” Diameter Mains New Pressure Zone Creation 7 PRVs and 12 Isolation Valves $4.7M Total Estimated Capital Cost

    3. Asset Management Project Approach Asset Management Predesign Review Business Case Evaluation Hydraulic Modeling Analysis Alternative Design Approaches Identify, Optimize, Assess, Compare Identify Preferred Design Solutions Detailed Design Construction

    4. Business Case Evaluation Process Form Expert Team – Highline and BC Staff Problem Definition Level of Service Definition Data Collection, Problem Characterization Alternative Development Brainstorming Alternative Performance Evaluations Hydraulic Modeling Analysis Alternative Performance, Cost, and Risk Comparison Preferred Solutions ? Detailed Design

    5. Business Case Difference Lifecycle Cost – A dollar is a dollar Capital, O&M, R&R, Risk Costs Triple Bottom Line Lifecycle Costing Financial Community/Social Environmental Preferred Solution = Lowest Lifecycle Cost that Meets Level of Service Decisions Justified, Documented, Repeatable Publically Defensible and Transparent

    6. Problem Definition Problem 1: Transmission Capacity Low Pressures Limited Fire Flow Problem 2: Dead-End Mains Water Circulation and Turn Over Low Pressures Limited Fire Flow Problem 3: High Pressure Areas Frequent Main Breaks

    7. Level of Service Definition Peak Hour Demand Pressures > 30-40 psi Max Day Demand + Fire Flow > 20 psi Dead-End Mains Address Pressures and Fire Flows Correct where Financially Preferable High Pressures and Main Breaks Distribution Leakage Standards Correct where Financially Preferable Goal: Max Static Pressures < 100 psi

    8. Data Collection and Problem Characterization Hydraulic Model System Performance Minimum Pressures, Fire Flows Water Main Breaks 3 to 4 Times More Frequent in High Pressure Areas $6K+ Average Cost per Break Repair Labor, Materials, Equipment Lost Water, Insurance Claims/Deductibles Reduce High Pressure Breaks to “Normal” Levels = $18K Annual Savings Dead-End Main Flushing is “Cheap”

    9. Future Model Scenario: Existing System Pressure and Fire Flow Performance

    10. High Pressure Area Raw Main Break Data

    11. High Pressure Area Main Break Comparison

    12. Main Breaks: High Pressures or Acidic Soils?

    13. Alternative Development Problem 1: Low Pressures and Fire Flows Pipe and Pump Improvements Various Sizes and Combinations Problem 2: Dead-End Mains Looping Alternating and Continuous Problem 3: High Pressure Areas New Pressure Zone PRV Quantity and Locations Isolation Valve Quantity and Locations

    14. Alternative Performance and Hydraulic Modeling

    15. Alternative Performance and Hydraulic Modeling

    16. Alternative Performance New Zone Area Pressures, Before and After

    17. Lifecycle NPV Cost Comparison Lifecycle Net Present Value (NPV) Analysis Capital (Design, Construction, CM) O&M, R&R, Risk Costs Amount Invested Today to Fund All Current and Future Asset Costs

    18. Risk Cost Considerations Risk Cost = (Probability) x (Consequence) Example A: (Annual Number of Main Breaks) x (Average Break Repair Cost) Example B: (Likelihood of Insurance Claim) x (Insurance Deductible + Staff Costs) Benefit Cost = (Probability) x (Avoided Consequence) Example C: (Avoided Number of Main Breaks) x (Average Break Repair Cost)

    19. Preferred Solution for Detailed Design Transmission Capacity Improvements 1800’ 12” Diameter Mains Pump Station Upgrades Dead-End Main Looping Improvements 2700’ 8” Diameter Mains (Alternating) New Pressure Zone Creation 3 PRVs Supply 50 psi Pressure Reduction Existing Valves Provide Zone Separation

    20. Preferred Solution Delivers Optimal Performance and Cost Savings

    21. Avoided Risk Costs Demonstrate Project Value High Pressure Areas Main Breaks $0.5M Lifecycle NPV Repair Cost New Pressure Zone Creation $0.4M Lifecycle NPV Cost $0.5M Lifecycle NPV Avoided Repairs $0.1M Savings Over Status Quo

    22. Asset Management Approach Success Business Case Evaluation and Hydraulic Modeling Analysis Approach Results: Cost Savings $2.6M Capital Costs = 53% $2.3M Lifecycle Costs = 45% Higher Overall Level of Service Takes Advantage of Existing Assets Pump Station Upgrades vs. New Water Mains New Pressure Zone Pays for Itself $0.4M Lifecycle Cost vs. $0.5M Avoided Lifecycle Main Break Repair Costs

    23. Acknowledgements Highline Water District: Matt Everett, General Manager Tom Keown, Engineering and Operations Manager Mike Becker, Operations Supervisor Dave Stanley, Field Supervisor Dan Sleeth, Maintenance Lead

    24. Questions?

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