? regarding service entrance grounding electrodes

[Wao nahele kane]

Though they (inspectors) may accept grounding through ground rods in solid lava... I wouldn't accept it for my house. I'd establish a vast amount of surface contact with Lava in order to establish enough conductance to Earth ground. As Royal and myself have pointed out, the rebar in your foundation, rafting pad (if used) and or even a steel bar and or steel mesh re-enforced driveway pad will establish a vast permanent conductive surface contact with the lava and the concrete will conduct electricity from the rebar to the lava. Concrete does coduct electricity mostly due to it's moisture absorbtion qualities and the mineral content of the mix, so, if you can imagine all that steel surface area tied together and then properly clamped to a copper grounding conductor imbeded in concrete that uses a large surface area contacting the poor conductive lava, then you have a good reliable ground extablished with solid bonds at all the conductive surface areas. Anyhow.. that's how I planned to have our ground established as we have very little soil and none of it is deeper than a foot at best. To get even better results you can have a small amount of soils (just enough to fill the voids) brought in to mix with the substrate you place under your driveway or rafting pad.
Just a thought to avoid having to pay a crew to come in and drill holes that might not be reliable.

E ho'a'o no i pau kuhihewa.