Drawing detail for site lighting calls for 10' x 3/4" ground rods at concrete bases for parking lot lighting and bollard style walkway lighting for new retail building construction project. Detail also shows #8 bare copper bonding metal pole to ground rod. I assume engineer called for this to limit potential lightning damage. Crew installed 8' x 5/8" ground rods into poured bases by mistake. We do have equipment grounding conductors pulled in with circuit conductors. My question is: Will 8' ground rods with #8 copper be sufficient for intent or do we need to go back and install 10' x 3/4" with # 8 copper. I question the size of the #8 grounding conductor also. Thanks for feed back.