§ 133.23 Investigation to determine the source and responsible party.

(a) The State official shall promptly make a thorough investigation to determine the source of the incident and the responsible party.

(b) Upon completion of the investigation, the State official shall forward the results of the investigation and copies of the supporting evidence identifying the source and the responsible party to both the cognizant OSC and the NPFC official specified in § 133.25(c).