Question:
How can we protect the underground pvc soil waste pipes? If plain cement concrete encasing is must, what depth from the road level, should we encase the pipe lines?
Answer:
PVC under roads should be at least 2 to 3 feet deep. Make sure the PVC pipe has a bed of crushed rock or coarse sand underneath it to maintain proper grade. Back fill with crushed rock or clean sand and gravel. This material should be installed from the bottom of the trench to the bottom of the pavement and should be compacted to 95% of proctor density.