OAR 340-150-0510
Suspected Release Investigation and Confirmation Steps

(1) Following the discovery of a suspected release of a regulated substance, an owner and permittee must immediately initiate investigation and confirmation of the suspected release as this rule requires. This investigation must be completed within seven days or as DEQ otherwise approves or directs.
(2) Upon expiration of the 7-day period or other period DEQ approves, an owner and permittee must notify DEQ of the investigation results by submitting to DEQ:
(a) A written description of the system test that confirmed a release did not occur, including any test results; or
(b) A written plan of action to complete the suspected release investigation system test or site assessment. Any plan of action must include a schedule for completion.
(3) System test.
(a) An owner and permittee must conduct tightness testing to determine whether a leak exists in any portion of the UST or the underground piping that routinely contains a regulated substance.
(b) An owner and permittee must investigate the cause of a release into any secondary containment unit including, but not limited to, underground piping, turbine sumps, transition sumps and dispenser pans by conducting tests in accordance with manufacturer requirements or as DEQ directs. All regulated substances (product) or product and water mixture must be removed from the containment system and properly disposed of in accordance with all state, federal and local requirements.
(c) If the suspected release was reported due to any of the conditions described in OAR 340-150-0500 (Reporting Suspected Releases)(1)(b), (c), or (d) and the system test results do not indicate that a release has occurred, further investigation is not required, unless DEQ directs otherwise.
(d) If the suspected release was reported due to any of the conditions described in OAR 340-150-0500 (Reporting Suspected Releases)(1)(a) or the system test results indicate that a release occurred, an owner and permittee must repair or modify the UST system and begin corrective action under sections (4) and (5) of this rule.
(4) Site assessment.
(a) An owner and permittee must conduct a site assessment per OAR 340-150-0180 (Site Assessment Requirements). An owner and permittee must measure for the presence of a release where contamination is most likely to be present based on all information available. In selecting sample types, sample locations and measurement methods, an owner and permittee must consider the nature of the stored substance, the type of initial alarm or cause for suspicion, the type of backfill, the depth to groundwater and other factors appropriate for identifying the presence and source of the release. The requirements for sample collection, analytical tests and methods contained in OAR 340-122-0205 (Cleanup Rules for Leaking Petroleum UST Systems: Purpose) through OAR 340-122-0360 (Cleanup Rules for Leaking Petroleum UST Systems: Reporting Requirements) must be used. DEQ may require that a sampling plan be submitted for approval before conducting any sampling on a case-by-case basis. In addition:
(b) If the results of the site assessment conducted under subsection (4)(a) of this rule does not indicate that a release has occurred, further investigation is not required unless specifically directed by DEQ.
(c) If the site assessment results indicate that a release has occurred, an owner and permittee must begin corrective action under section (5) of this rule.
(5) If the suspected release investigation confirms that a release has occurred, an owner and permittee must report the confirmed release to DEQ within 24 hours of confirmation and comply with the following release reporting, site investigation and corrective action requirements:
(a) For petroleum USTs: OAR 340-122-0205 (Cleanup Rules for Leaking Petroleum UST Systems: Purpose) through 340-122-0360 (Cleanup Rules for Leaking Petroleum UST Systems: Reporting Requirements).
(b) For USTs containing non petroleum regulated substances: OAR 340-122-0010 (Purpose) through 340-122-0115 (Definitions), except that releases must be reported as OAR chapter 340, division 142 requires.
(6) DEQ may require that an owner and permittee perform additional actions not specifically listed in this rule on a case-by-case basis to address actual or potential threat to human health or the environment.

Source: Rule 340-150-0510 — Suspected Release Investigation and Confirmation Steps, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-150-0510.

340‑150‑0001
Purpose and Scope 340‑150‑0006
Applicability and General Requirements 340‑150‑0008
Exemptions and Deferrals 340‑150‑0010
Definitions 340‑150‑0020
UST General Permit Registration Certificate Required 340‑150‑0021
Termination of Temporary Permits 340‑150‑0052
Modification of Registration Certificates For Changes in Ownership and Permittee 340‑150‑0080
Denial, Suspension or Revocation of General Permit Registration Certificates 340‑150‑0102
Termination of General Permit Registration Certificates for Installation, Operation and Temporary Closure 340‑150‑0110
UST General Permit Registration, Annual Compliance and Other Fees 340‑150‑0135
General Requirements for Owners and Permittees 340‑150‑0137
UST Systems with Field-Constructed Tanks and Airport Hydrant Fuel Distribution Systems 340‑150‑0140
Requirements for Sellers of USTs 340‑150‑0150
Depositing Regulated Substances in USTs 340‑150‑0152
Requirements for Distributors of Regulated Substances for Deposit into USTs 340‑150‑0156
Performance of UST Services by Owners or Permittees 340‑150‑0160
General Permit Requirements for Installing an UST System 340‑150‑0163
General Permit Requirements for Operating an UST System 340‑150‑0167
General Permit Requirements for Temporary Closure of an UST System 340‑150‑0168
General Permit Requirements for Decommissioning an UST System by Permanent Closure or Change-in-Service 340‑150‑0180
Site Assessment Requirements 340‑150‑0200
Training Requirements for UST System Operators and Emergency Response Information 340‑150‑0210
Training Requirements for UST Operators 340‑150‑0250
Expedited Enforcement Process 340‑150‑0302
Installation of Used USTs 340‑150‑0310
Spill and Overfill Prevention Equipment and Testing Requirements 340‑150‑0315
Periodic operation and maintenance walkthrough inspections 340‑150‑0320
Corrosion Protection Performance Standards for USTs and Piping 340‑150‑0325
Operation and Maintenance of Corrosion Protection 340‑150‑0350
UST System Repairs 340‑150‑0352
UST System Modifications and Additions 340‑150‑0354
UST System Replacements 340‑150‑0360
Requirements for Internally Lined USTs 340‑150‑0400
General Release Detection Requirements for Petroleum UST Systems 340‑150‑0410
Release Detection Requirements and Methods for Underground Piping 340‑150‑0420
Release Detection Requirements for Hazardous Substance UST Systems 340‑150‑0430
Inventory Control Method of Release Detection 340‑150‑0435
Statistical Inventory Reconciliation Method of Release Detection 340‑150‑0440
Manual Tank Gauging Release Detection Method 340‑150‑0445
Tank Tightness Testing for Release Detection and Investigation 340‑150‑0450
Automatic Tank Gauging Release Detection Method 340‑150‑0465
Interstitial Monitoring Release Detection Method 340‑150‑0470
Other Methods of Release Detection 340‑150‑0500
Reporting Suspected Releases 340‑150‑0510
Suspected Release Investigation and Confirmation Steps 340‑150‑0520
Investigation Due to Off Site Impacts 340‑150‑0540
Applicability to Previously Closed UST Systems 340‑150‑0550
Definitions for OAR 340-150-0555 and 340-150-0560 340‑150‑0555
Compliance Dates for USTs and Piping 340‑150‑0560
Upgrading Requirements for Existing UST Systems 340‑150‑0600
Delegation of Program Administration 340‑150‑0620
Approval of More Stringent Performance Standards
Last Updated

Jun. 8, 2021

Rule 340-150-0510’s source at or​.us