I have my new house dried in and I'm ready to have temporary electric service installed. The problem is that the house is built on solid shale and driving the grounding rod may be a problem. Is it legal by code to simply lay the grounding rods in the conduit trench before backfilling (it's underground service)? Can I try to drive them horizontally between layers? I'm also worried about making a good earth connection. Any tips or tricks?
The pix below show the "soil" conditions. In 021 I'm setting the footer forms. In 036 we're digging the frost footer.