(a) A gas leak record, identified by number, shall be used to depict the entire history of a leak from the time of discovery through the follow-up inspection.

(b) The record shall contain information as to the nature of the repair and follow-up results.

(c) Leaks shall only be classified or reclassified by a responsible and experienced individual whose name shall appear on the record.

(d) The gas leak record shall contain an adequate number of readings from the sample points tested during the leakage investigation to depict the extent of hazardous gas migration, expressed in percent gas-in-air or percent LEL found at the time of classification, reclassification if applicable, surveillance investigations, during leak repair activities, after completion of repairs, and at any follow-up inspections.