340-150-0420 Release Detection Requirements for Hazardous Substance UST Systems (1) An owner and permittee of an UST system containing a hazardous substance other than petroleum must provide release detection that meets the requirements of this rule. (2) Secondary containment systems. An owner and permittee may use the provisions of 40 CFR § 265.193, “Containment and Detection of Releases” to comply with this section of the rule. Secondary containment systems must be designed, constructed and installed to: (a) Contain regulated substances released from the UST system until they are detected and removed; and (b) Prevent the release of regulated substances to the environment at any time during the operational life of the UST system. (3) Multiwalled USTs must be designed, constructed and installed to: (a) Contain a release from any portion of the inner tank within the outer wall; and (b) Detect the failure of the inner wall. (4) External liners (including vaults) must be designed, constructed and installed to: (a) Contain 100 percent of the capacity of the largest tank within its boundary; (b) Prevent the interference of precipitation or groundwater intrusion with the ability to contain or detect a release of regulated substances; and (c) Surround the tank completely (i.e., it is capable of preventing lateral as well as vertical migration of regulated substances). (5) Underground piping must be equipped with secondary containment that satisfies the requirements of section (2) of this rule (e.g., trench liners, jacketing of double walled pipe). In addition, underground piping that conveys regulated substances under pressure must be equipped with an automatic line leak detector in accordance with OAR 340-150-0410(2). (6) An owner and permittee must monitor the UST system for releases every 30 days and record the results for each month. (7) An owner and permittee must retain at a minimum the most current 12 consecutive months of release detection records. (8) An owner and permittee must report to the department any release detection failure indicating the possibility of a release within 24 hours as a suspected release (OAR 340-150-0500) and immediately begin investigation in accordance with 340-150-0510. (9) An owner and permittee may use an alternative method of release detection if the proposed method is approved by the department in writing before installation of the UST system or addition of the release detection method. To obtain approval from the department, an owner and permittee must submit the following information for review: (a) Technical, scientific data and reports that demonstrate that the proposed alternate method can detect a release of the stored hazardous substance as effectively as any of the methods allowed in OAR 340-150-0450 through 340-150-0470 can detect a release of petroleum; and (b) Information on the effective corrective action technologies, health and environmental risks and chemical and physical properties of the stored substance and the geologic characteristics of the UST facility. [Publications: Publications referenced are available from the agency.] Statutory/Other Authority: ORS 466.706 - 466.835, 466.994 & 466.995 Statutes/Other Implemented: ORS 466.746 & 466.765 History: DEQ 6-2003, f. & cert. ef. 2-14-03