1. Innovative Approach to Water Main Renewal
Yogesh Shah, P. Eng.
Director of Engineering Infrastructure
City of Cambridge
CNAM 2014 Conference
Toronto, Ontario
May 20-24, 0214

2. Agenda State of Water Infrastructure 2009 Water and WW financial plan
Water Main Rehabilitation pilots
Decision Model – Reconstruction vs Replacement
Projects
Summary & KPI

3. Transportation & Public Works
City of Cambridge
Population – 130,000
Water distribution
Transportation & Public Works
Public Works
(Operations)
Asset Management
Engineering

4. State of Infrastructure : Water 2009
Water Main Breaks
50 per year – repair cost $0.5 million
8-9 breaks per 100km
90% breaks - Cast Iron Pipes
Water Service Breaks

5. State of Infrastructure : Water 2009
24.6% Non-revenue water ($3M)

6. Water and WW Financial Plan 2009
Backlog identified as
Thin-walled CI water pipes (28 km)
100mm (4”) water pipes (30km)
More than 3 WM breaks per block in last 10 years
Estimated backlog ($54M)
$4.5M Debentures (debt financing) in 2011
9-10% rate increases for 5 years – Financial Plan
Capital budget increased from $3.2M to $8M in 5 years to provide sustainable funding

7. Moving Plans to Action Water Leak Investigation Program
Insufficient staff resources for project management
Limited In-house expertise for WM rehabilitation
Hired consultant
to formulate strategy
project management
Water Main Rehabilitation pilot project
AMEC and Robinson

8. Moving Plans to Action – Pilot 1 CIPP
Guelph Ave Collector road in Core area
300 mm Cast Iron / Ductile Iron 780m
Scope extended to get better pricing
Cement Mortar Lined CI/DI
FerPal Infrastructure
15 Trenches – 1 every 50m
Cost $800/m – 40 Days
No road work

9. Moving Plans to Action – Pilot 2 SIPL
Pine Street – Residential Street
150mm(6”) Cast / Ductile Iron - 500m
Poor road condition - no service breaks
SIP Polyurea lining by ACURO
Brantford – Caesar
Envirologics

10. Moving Plans to Action – Pilot 2 SIPL
Same day return to service
Equipment failure
Re-establishment of services requires robotic drilling (6/32 required excavation)
Unknown pipe condition
Coal Tar
Blown stone cleaning
20 working days

11. Pine Street – Pilot 2 SIPL
Grinding damage to exterior threaded portion of Main stop
Ongoing monitoring for leak detection

12. Pine Street – Pilot 2 SIPL
Dripping and pooling of spray on liner at top and bottom
$485K for $980/m

13. Moving Plans to Action-Decision Model
Experience from CIPP and SIPL Pilots
Services and number of Access Pits
Residential Street vs Industrial Area
Depth of pipe and Construction Access
Social and traffic impact (Local vs Collector road)
Condition of other Infrastructure
Streets resurfaced

14. Moving Plans to Action- Reconstruction
Replacement of pipe is preferred over rehabilitation
Pipe size < 200mm(8”)
Residential streets with many service connections
Condition and potential impact to infrastructure (Sanitary / Storm)
Pavement structure condition

15. Moving Plans to Action- Rehabilitation
Rehabilitation of pipe is preferred over replacement
Pipe size >= 200mm(8”)
Industrial area with fewer service connections
Collector road with high traffic volume
Average road condition due for resurfacing
Trenching is not feasible (pipes in easement with no service connections)
Sanitary and Storm pipes are in good condition

16. Rehabilitation Projects

17. Reconstruction Projects

18. Services

19. Summary 5.2km Pipes rehabilitated at $974/m
Includes Hydrant, Valve replacement, Trench restorations
Few services replaced
No road resurface work included
4.6km Pipes $873/m
Includes Hydrant, Valve replacement
Reconstruction/resurfacing of road included
Services replaced – trenchless preferred
Over 20km Pipes replaced as part of full reconstruction projects

20. KPI Toronto WM break - Global News Cambridge
14.5 breaks per 100km (winter 2013/14)
7.4 breaks per 100km previous 5 year average
Cambridge
18 breaks/100km last winter as per projection (8-9 breaks/100km in 2009)
7.4 breaks/100km for winter 2013/14
39 breaks instead of projected 94 breaks
5.2 breaks/100km for 2013

21. KPI 18.9% Non-revenue water use (24.6% in 2009)
Annual savings of $1.3M
7% Rate Increase as per revised financial plan Sept 2013

22. Questions? Contact: Yogesh Shah Director of Engineering Infrastructure