I have question for you all reguarding a recent situation. I just completed installing a 600a 3phase 208v service. The customer decided to redue there driveway/parking lot. They found the old galv water main was leaking undergound and decided to replace this with PVC. Now my new service has no grounding other than 2 grounding electrodes. There is no building steel as the building is 200 yrs old, wood and stone. What would be the next best solution? Grounding ring is out as there is no way to loop around this structure.

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