R6‑18 CHANGE IN CHARACTER OF SERVICE
The following procedure shall be followed whenever there is a material change in the character of the gas service:
(1) Changes under the Control of the Utility. - The utility shall make such changes only with the approval of the Commission, and after adequate notice to the customers.
(2) Changes Not under the Control of the Utility. - The utility shall maintain the proper combustibility of the gas supplied at the heating valve and specific gravity existing at the customers' meters (See Rule R6‑34(b)).