(1) Owners and operators, any person who installs or removes an UST, or who performs subsurface investigations for the presence of regulated substances, and any person who performs a tank tightness or line tightness test pursuant to ARM 17.56.407 or 17.56.408, must report suspected releases to a person within the department or to the 24-hour Disaster and Emergency Services duty officer available at telephone number (406) 324-4777 within 24 hours of discovery of the existence of any of the following conditions:
(a) visual or olfactory observations, field monitoring results or other indicators of the presence of regulated substances in soil or nearby surface or ground water, or the presence of free product or vapors in basements, sewer or utility lines;
(b) the sudden or unexplained loss of product from the tank system;
(c) a failed tightness test, performed in accordance with subchapter 4, unless the tank system is found to be defective but not leaking and is immediately repaired or replaced;
(d) sampling, testing, or monitoring results from a release detection method, performed in accordance with subchapter 4, that indicate a release may have occurred, unless the release detection or monitoring device is found to be defective and is immediately repaired, recalibrated, or replaced, and subsequent monitoring, sampling, or testing indicates that the system is not leaking;
(e) the presence of product in the tank secondary containment system;
(f) erratic behavior of product dispensing equipment or automatic release detection equipment unless the equipment is found to be defective but not leaking, and is immediately repaired or replaced;
(g) an unexplained presence of water in the tank or liquid in the interstitial space between the tank and the tank secondary containment;
(h) inconclusive results from a tank tightness test, performed in accordance with subchapter 4, unless the tank system is found to be defective but not leaking;
(i) sampling, testing, or monitoring results from a release detection method, required under subchapter 4, that are inconclusive and cannot rule out the occurrence of a release, unless the monitoring device is found to be defective and is immediately repaired, recalibrated, or replaced, and subsequent monitoring, sampling, or testing indicates that the system is not leaking;
(j) analytical results from soil samples that exceed 200 milligrams per kilogram for extractable petroleum hydrocarbons (EPH); and
(k) activation of a leak detection equipment monitoring alarm, or activation of flow restriction mode for a mechanical line leak detector, unless:
(i) within 24 hours of the occurrence of the condition, the condition is investigated, the cause of the condition is discovered, corrected, and a release to the environment or to secondary containment has not occurred;
(ii) the leak detection system is returned to a fully operational condition within 24 hours; and
(iii) records documenting the cause of the condition and the investigative and corrective actions undertaken in response to the condition are maintained for a one-year period at the facility, or at a readily available alternative site, where the records may be provided for inspection by the department upon request.
(2) Messages left on answering machines, received by facsimile, e-mail, voice mail, or other messaging device are not adequate 24-hour notice. For further assistance, the department's release reporting hotline may be reached at 1 (800) 457-0568.