Be prepared to wash down the inside of the dome (EVERYTHNG) with a water hose. Tie a good lead on the wires in your conduit, and pull the wire back a couple of feet. Rent a small buster, and a saw. Bust out around the conduit before you cut, and try not to cut the conduit. It's not a question of PVC being easy to repair-you can't repair it unless you have something to glue to. Once your saw cuts are made, a couple of boards for isolation spacers and (hopefully) a sack of ready mix to patch the busted out portion. Wash down the inside of the dome. Other than taking everything out of the dome, busting out the entire pier and repouring, I don't see any other way... Hubert