The day consisted of a morning session onsite to seal the leaks using a pumping system and Prime Resins "Prime Flex" polyurethane grouts.  An afternoon classroom session was held at a separate facility to host a technical presentation and lunch.

Steps used to seal the Vernon manhole chamber:

1. The manhole chamber appeared to have two separate leaks:
   Leak A - approximately 5 gallons per minute gushing leak where a pipe penetration met the 20” PVC base invert
   Leak B - 0.5 gallon per minute leak under stair rails
2. Leak A - seal the 5 GPM leak using Prime Resins 920 Hydrophobic. We came to a the consensus that the water was likely traveling along the 8” pipe that penetrated the invert.
3. Without knowing the thickness of the poured concrete bench, we decided to drill above the pipe and have the product react with the water and travel down to the leak location.
4. After injecting approximately 1 to 2 gallons of grout with no sign of resin in leak we determined that this drill location did not intercept the flowing water. The resin did flow in without any resistance, so we suspect that we filled a void and stabilized some of the surrounding soil.
5. Second drill attempt was just above the leak on the bench angling down towards the flowing water. Once again, no sign of resin in water flow.
6. At this point we determined that the water was actually following the 20” invert pipe, not the intersecting pipe.
7. Our third attempt was to drill through the 20” invert pipe. We immediately started seeing resin in the water flow.
8. Using Oakum and Prime Flex 900 to reduce the leak, we were able to quickly stop this leak by forcing the 920 to travel through the invert allowing it to expand 3000% and seal all leaks at that location.
9. Leak B - Seal the leak under the stairwell. One drill hole and approximately 0.5 liters of resin was all we needed to seal this leak.
10. Leak C - As we were monitoring the original leak the water migrated to another defect within the chamber causing a leak at the base and precast barrel.
11. We injected approximately 1 gallon at this location. We observed the resin seal this leak as well seal other defects within the base. Small amounts of resin were appearing in multiple locations.

Steps used to seal this Kelowna manhole chamber:

1. The manhole chamber appeared to have one major leak gushing approximately 6 gallons per minute where a pipe penetration met the invert.
2. Seal the 6 GPM leak using Prime Resins 920 Hydrophobic. We came to a the consensus that the water was likely traveling along the pipe that penetrated the invert.
3. Without knowing the thickness of the poured concrete bench, we decided to drill above the pipe and have the product react with the water and travel down to the leak location.
4. After injecting approximately 4 gallons of Prime Resins product with no sign of resin in leak we determined that this drill location did not intercept the flowing water. The resin did flow in without any resistance, so we suspect that we filled a void and stabilized some of the soil surrounding the chamber.
5. Second drill attempt was just above the leak on the bench angling down towards the flowing water. Once again, no sign of resin in water flow.
6. Third attempt we applied the stinger valve in the flowing water.
7. We used the remaining 1 gallon of 920 to create a backing in the void.
8. We injected 5 gallons of Prime Resins HydroGel directly into the leak. As the hydrophilic product began flashing, the gushing leak started to slow down.
9. Using Oakum and Prime Flex 900 to reduce the other leaks appearing under the pipe penetration, we were able to quickly stop this leak by forcing the HydroGel to travel throughout the manhole bench, allowing it to seek all water sources and sealing all leaks at that location.
10. Interesting point to note: the HydroGel material was emerging through multiple defect points around the chamber.

Steps used to seal this Burnaby manhole chamber:

1. The manhole chamber appeared to have one primary leak at approximately 2 gallons per minute and two others at approximately 0.5 gallons per minute each. These leaks were positioned at the meeting of PVC and concrete and resulted from incompatible material.
2. Our consensus was that the water was traveling between the invert and PVC.
3. Without knowing the thickness of the poured concrete bench, we decided to drill directly into the pipe and have the HydroGel (hydrophilic) grout chase the water and create a flexible compression seal between the PVC and concrete.
4. We injected 1 to 2 gallons of Prime Resins product through a single hole. Immediately we started seeing the milky colored resin appear at multiple locations. This was the sign that we had indeed hit the source of the water flow!
5. Using Oakum and Prime Flex 900 to dam other leaks that were appearing, we were able to quickly seal the entire bench using only HydroGel. Hydrophilic grouts seek out water and offer the ability to seal multiple leaks with a single injection point.