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Can you use trenchless technology on a bellied line? Is it just putting a new line into the same problem? Does it need to be dug up and repaired?

Trenchless technology cannot be used on a bellied line because the sleeve will simply follow the existing pipe and end up with a belly. The line has to be dug up at the belly and repaired with a new section of pipe to correct the belly. There are other techniques for running a new line alongside the existing sewer line with directional boring or with a pneumatic gopher. Both of these technologies, however, might encounter problems with rocks or underground cables if they are in the path of the bore.

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