City of Greater Sudbury Lining Program Overview Brittany

City of Greater Sudbury Lining Program Overview Brittany Hallam, P. Eng. D&C Operations Engineer City of Greater Sudbury May 16, 2018

What is Structural Lining? • Cured-in-Place Pipe (CIPP) – Gravity and pressure pipe – Resin impregnated fabric – Cured by hot water or steam – Fully structural – Smoother surface – Minimum Design Life: 50 Years

Trenchless Rehabilitation - Benefits • Limit Traffic Disruptions:

Trenchless Rehabilitation - Benefits • Hard to Reach Areas:

Trenchless Rehabilitation - Benefits • Cost and Time:

CGS Background • 942 km of water mains and 778 km of sanitary sewer mains • Increasing age of infrastructure • Current average age: 48 yrs • Large infrastructure funding gap

CGS Watermain Lining Program • 2011 - Test project • 2015 - First 3 Year Contract • 2018 - ~$6 Million

CGS Watermain Lining Program • Choosing locations for lining: – Break frequency – Operational concerns (ie. Discoloured water, low pressure) – Resurfacing projects – Access restrictions

When to Line vs. Replace a Watermain • • • Adequate flow No significant growth projections Limited bends and fittings Sanitary in good or linable condition High traffic areas or inaccessible areas

Watermain Lining • Access pits at hydrants, valves, fittings, and bends • 175 meter runs on most mains • 200 meter runs on 6’’ mains • 4’’ to 24’’ diameter mains • Successfully completed projects to line 30’’, 36’’ and 48’’ mains • Line through 22 ½º and some 45º bends • ~$900 to $1, 000 per meter on 200 mm

Watermain Lining • Steps: 1) Temporary By-pass 2) Access Pits 3) Perimeter Valve Installation 4) Pipe Cleaning 5) CCTV Inspection – pre lining 6) Liner Installation 7) Reinstatement of Services 8) CCTV Inspection – post lining 9) Disinfection 10) Reconnection & Restoration

CGS Sanitary Sewer Lining Program • 2015 – First 3 Year Contract • 2016 – 5. 6 km Lined • 2017 – 11 km Lined

CGS Sanitary Sewer Lining Program • Choosing locations for lining: – Condition Assessment Program – I&I Studies – Watermain Projects – Operational Priority (ie. Multiple spot repairs) – Resurfacing Projects – Access Restrictions

Sanitary Sewer Lining • Manhole to Manhole • No excavation • Cracks, fractures, holes, minor offsets • 150 mm to 500 mm • ~$170 per meter on 200 mm

Sanitary Sewer Lining • Cautionary Tale: – Main collapse in the process of liner curing

Pros and Cons of a Multi Year Lining Contract • Pros: – Early Project Start-up – Ability to Add Locations – Time Saved not Tendering – Building Relationship with Contractor

Pros and Cons of a Multi Year Lining Contract • Cons: – Difficulty with Contract Structure – Unforeseen Added Costs – Less Control Over Contract Schedule

Overview • CGS lining programs are growing exponentially • Multi-year contracts are one of many tools to accelerate these programs • Familiarize yourself with the process before putting out a contract

Questions?