Replacing subpanel in detached building - yet another ground/neutral question
Ok, just got off the phone with a guy from our regional building department.  The conductor that is buried with the gas line is NOT meant to electrically connect the metal pipe in the garage with the main service line (&amp; therefore house, which has metal pipe from meter).  The conductor is a tracer and is only there to assist in locating the gas line.  It should not be connected to the pipe at either end.

So with a plastic pipe on the gas, there is no alternate conductive path back to the house, so I'm good on Requirement 2.  I just bond the neutral &amp; ground at the sub-panel and put in two grounding rods (which should have been there for the old system as well).