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 (Release Detection Requirements and Methods for Underground Piping) through 340-150-0465 (Interstitial Monitoring Release Detection Method) 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 (Reporting Suspected Releases)) and immediately begin investigation in accordance with 340-150-0510 (Suspected Release Investigation and Confirmation Steps); 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.
Source:
Rule 340-150-0470 — Other Methods of Release Detection, https://secure.sos.state.or.us/oard/view.action?ruleNumber=340-150-0470
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