Section 144-232-2-201.0 - GRANDFATHER CLAUSE:201.1Open loop geothermal heat exchange license endorsements: Current master and journeyman well driller licensees shall be grandfathered for open loop endorsement for a period of 180 days from the effective date of these rules geothermal heat exchange well rules, May 25, 2011. Appropriate application must be made on forms provided by the Commission prior to the expiration of the grandfathering period.201.2Closed loop geothermal heat exchange license endorsements: Current master and journeyman well driller licensees with current IGSHPA certification shall be grandfathered for closed loop endorsement for a period of 180 days from the effective date of these geothermal heat exchange well rule, May 25, 2011.. Appropriate application must be made on forms provided by the Commission prior to the expiration of the grandfathering period.201.3Master closed loop geothermal heat exchange installers: A grandfathering period of 180 days from the effective date of these geothermal heat exchange well rules, May 25, 2011, shall be provided for master closed loop geothermal heat exchange installers. To qualify, evidence of a minimum of 10 completed closed loop geothermal heat exchange wells and current IGSHPA certification must be provided to the Commission along with appropriate application prior to the expiration of the grandfathering period.10-144 C.M.R. ch. 232, § 2-201.0