Is there any code requirements that conduit can not touch other pipes? It is underground PVC conduit up against pvc cold water pipe so i am not worried about dissimilar metals or vibration.
This would be a good place to interject a rule of thumb norm(as I know it) usually written into General Specifications in a lot ofindustrial facilities.
6" clearance when crossing and 12" clearance when running parrallel both AG and UG
This usually has in mind a possible aid in digging up an UG run and if hot temp line to not induce heat into conductors.