ECN Forum Forums Code Related Discussion NEC & other Code issues ditch depth under "pavers"??

300.5 uses the words "concrete" and "slab". That can't be confused with pavers. I won't say your AHJ won't go along but I am not sure how.
RNC is only 6" anyway so he might consider 2" of paver as being part of the 6" cover. Keep it 5' away from the water if at all possible.