(a) In this section, "distribution gas pipeline facility" means a pipeline facility that distributes gas directly to end-use customers.
(b) A distribution gas pipeline facility operator may not install as part of the operator's underground system a cast iron, wrought iron, or bare steel pipeline.
(c) The railroad commission by rule shall require the operator of a distribution gas pipeline facility system to:
(1) develop and implement a risk-based program for the removal or replacement of underground distribution gas pipeline facilities; and
(2) annually remove or replace at least eight percent of underground distribution gas pipeline facilities posing the greatest risk in the system and identified for replacement under the program.