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Trenchless Sewer Rehabilitation
The City of White Rock retained Kerr Wood Leidal to develop
and implement a city-wide sanitary sewer rehabilitation program
designed to reduce inflow and infiltration (I&I).
Program's Components and Goal
The program's goal is to meet the GVRD Liquid Waste Management
Plan's objectives for I&I reduction. This comprehensive
program includes flow monitoring, field inspection, system modelling,
I&I characterization, rehabilitation and post-rehabilitation
assessment.
System Assessment and Repairs
The 8-hectare rehabilitation area consists of benched and sloped
development, containing some 7,000 metres of AC, PVC, and VT
pipe ranging in size from 150 to 375 millimetres in diameter.
KWL assessed the condition and performance of the sewer system
via CCTV inspection of the sewers and flow monitoring. It then
identified specific pipes requiring repair and the appropriate
repair techniques. These included relining (segmental and manhole-to-manhole),
grouting (mainline joint and service interface), and open trench
point repairs.
The rehabilitation work consisted of the following:
- relining of 460 metres of pipe, plus 6 segmental
point repairs
- testing and/or grouting of 5,100 metres of pipe,
including 250 service interfaces
- excavated point repairs at 23 locations.
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Contract Administration
Contracts for the repair work were awarded based on rehabilitation
technique. KWL recommended that follow-up pressure testing be
awarded to a different contractor to ensure independent verification
that the work was completed as specified.
Next Phase
KWL will continue the flow monitoring program to assess the
effectiveness of the rehabilitation work. The results will also
be used to identify and prioritize future rehabilitation projects,
ensuring that the City of White Rock progresses towards compliance
with the GVRD's Liquid Waste Management Plan in a well-planned
and efficient manner. |
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