020-17 Wyo. Code R. § 17-18
All UST system owners and/or operators shall maintain records in accordance with Section 13 demonstrating compliance with all applicable requirements of this part. These records shall include the following:
(a) Performance Claims: All written performance claims pertaining to any release detection system used, and the manner in which these claims have been justified or tested by the equipment manufacturer or installer, shall be maintained for three (3) years, from the date of installation;
(b) Test Results: The results of any sampling, testing, or monitoring shall be maintained for at least three (3) years; and
(c) Calibration, Maintenance and Repair: Written documentation of all calibration, maintenance, and repair of release detection equipment permanently located on-site shall be maintained for the operational life of the tank in accordance with W.S. 35-11-1416(a)(vi). Any schedules of required calibration and maintenance provided by the release detection equipment manufacturer shall be retained for the operational life of the tank.
020-17 Wyo. Code R. § 17-18