That's a good one Roger!
I had a very bad experience one time. The engineer spec'd GRC for the service and would not allow PVC.
A large parking area drained into the service trench, even after backfilling our service counduit made a very nice drain for the parking lot. And of course it drained right into our brand new service equipment.
We dug the trench out twice before we were able to stop the water. First time we tried to seal the couplings with a rubber sealant........that didn't work. Second time we encapsulated the coupling in bentonite (sp?) that did the trick.
Since that time I've avoided using GRC underground, but I'm looking at a job now where it's in the spec again.
GJ
