On this job, we had to remove the original 4” pipe that was installed incorrectly and not grouted into the catch basin. This caused water to leak and in turn collapsed part of the roadway. We installed a new 6” pipe and properly grouted the pipe to the catch basin using hydraulic concrete.
The original pipe had been improperly compacted with large rocks around the pipe. If large rocks are not removed before the compaction process, the pipe can be damaged as well as create voids around it.