(a) Whenever the operator performs a leakage survey, as required by section 255.706 or 255.723 of this Title, said survey is to include all known underground gas piping beyond the outlet of the customers's meter, excluding customer piping in industrial complexes.

(b) A building used exclusively for metering and/or regulating gas is not considered the customer's building for purposes of compliance with this requirement.

(c) In the case of nonresidential customers, the customer may accept responsibility for the required leakage survey; however, the operator must maintain appropriate records and verify that the leakage survey was completed.