OAR 340-150-0470: Other Methods of Release Detection

(1) An owner and permittee may use a release detection method for an UST or underground piping not otherwise specified in OAR 340-150-0410 through 340-150-0465 if: (a) The device is able to detect a 0.2 gallon per hour leak rate with a probability of detection of at least 95 percent and a probability of false alarm of no more than 5 percent for all portions of the UST or underground piping that routinely contains a regulated substance; (b) The method is an approved leak detection method or equipment as listed by a national organization (e.g., the National Work Group on Leak Detection). (2) An owner and permittee must monitor the UST and underground suction piping for a release at least every 30 days and record the results for each month. (3) An owner and permittee must monitor pressurized underground piping for a release daily and record the results daily for each month. (4) An owner and permittee must: (a) Report to the department any release detection test results indicating the possibility of a release (i.e., test failure or alarm) within 24 hours as a suspected release (OAR 340-150-0500) and immediately begin investigation in accordance with 340-150-0510; and (b) Immediately investigate all larger-than-normal or reoccurring variations in monitoring results and, if the variation cannot be accounted for, report such variations to the department as a suspected release without waiting to obtain a second confirmation of data. (5) An owner and permittee must retain at a minimum the most current 12 consecutive months of release detection records.