In the sanitary line, the top hat liner was placed at each lateral location after installing the mainline CIPP.
The challenge we had as contractors was estimating costs. Implementation was difficult.
Mostly based on condition and/or history. Can have trouble after the first bend on occaision (not all cameras are created equal)
The WSSC presentation focused on the system as a whole and not 1 project - anything mentioned would be an average and may not be accurate when looking at a small portion of the system.
Multiple methods (typically cored with a saddle tap or point repaired with factory style wye).
Very minor wrinkles can be found within the mainline but not enough to stop useage
This is obviously important - all forms should be dealt with when possible.
5285 Westview Drive
Frederick, MD 21703