I am working on a lightning protection project that is assessing the protection of an existing industrial facility. The building is OLD, and no one/no document seems to be able to show the grounding layout of the building (specifically below grade). In addition, every inch of ground surrounding the building for a good distance is concrete. We have about eight down comers from the building per our lightning protection plan. The building is also over 60' tall, so a ground ring is required per 780.

A suggestion has been given that the contractor will have to "score" the concrete around the entire building, bury the ground ring and rods, and then fill. Is this the best way to go about retrofitting a building with lightning protection? It seems like such a labor intensive process. Does anyone have a better method for doing this sort of work?

Any suggestions would be appreciated!!
--Nate from Baltimore