020-17 Wyo. Code R. § 17-19
Owners and/or operators of storage tank systems shall orally report to the department within twenty-four (24) hours all releases or suspected releases in accordance with Section 22 and follow the procedures of Section 22. Owners of sites where storage tanks were formerly located shall also report within seven (7) days after discovering any new evidence of a release. These reports shall be made for any of the following conditions:
(a) Released Regulated Substances: The discovery by owners and/or operators or others of released regulated substances at the storage tank site or in the surrounding area (such as the presence of free product or vapors in soils, basements, utility lines, nearby surface water and/or groundwater);
(b) Unusual operating conditions: Unusual operating conditions observed by owners and/or operators (such as the erratic behavior of product dispensing equipment, the sudden loss of a regulated substance from the storage tank system, or an unexplained presence of water in the storage tank), unless system equipment is found to be defective but not leaking, and is immediately repaired or replaced; and
(c) Monitoring results: Monitoring results from a release detection method required under Section 14 through 17 that indicate a release may have occurred unless the monitoring device is found to be defective, and is immediately repaired, recalibrated or replaced, and additional monitoring does not confirm the initial result.
(d) Off-site Impacts. Owners and/or operators of storage tank systems, and owners of former storage tank sites, shall follow the applicable procedures in Section 20 or 21 to determine if the storage tank system is the source of off-site impacts. These impacts include the discovery of regulated substances (such as the presence of free product or vapors in soils, basements, utility lines, nearby surface water and groundwater) that have been observed by the department or brought to its attention by another party.
020-17 Wyo. Code R. § 17-19