Rehabilitate or Replace 10 Years of the Trenton Water Works Experience

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1 Rehabilitate or Replace 10 Years of the Trenton Water Works Experience Michael L. Altland, PE

2 TWW System & Service Area Outline Previous Cleaning and Lining Programs Replace Versus Rehabilitate Construction Issues

3

4 Background TWW Distribution System 28 MGD Average Demand Surface Water ( Delaware River) 4 Pressure Zones 5 Municipalities

5 Background 683 Miles of Main 4-36 Majority CI or DI Very limited other materials

6

7

8 Historic Program TWW System Chart of Lined and year Map of area

9 Decades of Rehab

10

11 Annual Footage FT/yr 37+ Miles Total

12 Rehab $/Year Total new plus rehab > $30 Million

13

14 Identifying Priority Areas Hydraulic Model Updated regularly to included latest projects Fire Flow analysis Increase 4 to 8 Looping mains

15 Model C Values Indicator of Internal Roughness

16 Identify Priority Areas Customer Complaints Pressure Red Water

17 Priority Areas Main Breaks

18 Priority Areas Water Quality Results DBP Samples UDF Results

19 Priority Areas Road Reconstruction Drainage Projects

20 Priority Areas Road moratoria

21 Rehabilitate/ Replace 4 Main Question C&L Abandon in Place and Install New

22 Rehabilitate C&L Pros Limited excavation If low demand area, not increasing residence time $ 70/lf vrs $125/lf new

23 Lined Pipe Limited exterior corrosion

24

25 Rehabilitate/ Replace Replacement Pros Improved Fire Flow Service Replacement (especially galvanized) Driven Services Eel Traps

26 C&L 4 Vrs. 8 Relay

27 Service Transfers Field Issues Replacement Only

28 Fire Hydrants/ Runouts

29 6 Valves Valve Replacements Rehabilitation

30 Valve Replacements New Functioning Valves

31 Field Leak Replace Defective Main

32 8 Relay/ Replacement Note Temporary Bypass in Place

33 Summary Rehabilitation Required Miles Unlined - Major Capital Investment - Most Cost Effective Method Still Rehab

34 Thank You and Questions? Mike Altland, PE (973)

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