OAR 340-150-0180
Site Assessment Requirements

(1)

An owner and permittee must complete a site assessment to measure for the presence of a release where contamination is most likely to be present at the UST facility and must submit results of the assessment to DEQ when any of the following events occur:

(a)

Decommissioning (OAR 340-150-0168 (General Permit Requirements for Decommissioning an UST System by Permanent Closure or Change-in-Service)); or

(b)

Request for Extension of Temporary Closure Certificate (OAR 340-150-0167 (General Permit Requirements for Temporary Closure of an UST System)); or

(c)

Underground piping is modified, decommissioned by removal, or abandoned; or

(d)

Dispensers are moved, modified, decommissioned or abandoned unless the dispenser has under dispenser containment (UDC).

(2)

In selecting sample types, sample locations and measurement methods, an owner and permittee must consider the method of closure, the nature of the stored substance, the type of backfill, the depth to groundwater, and other factors appropriate for identifying the presence of a release.

(3)

For USTs containing petroleum, the owner and permittee must measure for the presence of a release by following the sampling and analytical procedures specified in 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) and section (5) of this rule.

(4)

For USTs containing regulated substances other than petroleum, including waste oil tanks, petroleum USTs to be closed in-place, and USTs to undergo a change-in-service, an owner and permittee must submit a written site assessment plan (i.e., sampling plan) to DEQ and receive DEQ approval before beginning permanent closure or change-in-service. The plan must include the following information:

(a)

A site diagram, drawn to scale, that identifies:

(A)

The location of all USTs and underground piping, dispenser islands, buildings and nearby properties;

(B)

All surface water bodies within 1⁄4 mile of the UST facility;

(C)

Any potential conduits for spreading contamination that may exist (e.g., water or sewer lines); and

(D)

All proposed sample locations, clearly marked.

(b)

A list of analytical procedures and sample collection methods to be used;

(c)

General information about the sample collector and UST facility;

(d)

The location of all proposed sampling points that meet the requirements of section (5) of this rule; and

(e)

Any other information as DEQ specifies.

(5)

Unless DEQ directs or approves otherwise, an owner and permittee must meet the following requirements for sampling and analysis:

(a)

Soil samples must be collected from the native soils located no more than two feet beneath the bottom of the tank pit in areas where contamination is most likely to be found;

(b)

For in-place closure or change-in-service of an UST, a minimum of four soil samples must be collected, one each from beneath both ends of the tank and on each side;

(c)

For the removal of a single tank, two to four soil samples must be collected as appropriate based on site conditions, including the condition of the removed tank;

(d)

For the removal of multiple USTs from the same pit, in addition to subsection (c) of this section, one soil sample must be collected for each 100 square feet of area in the pit from areas where contamination is most likely to be found;

(e)

For underground piping:

(A)

For piping runs between 5 and 20 feet, a minimum of two soil samples must be collected from the native soils directly beneath the areas where contamination is most likely to be found, unless otherwise approved by DEQ; and

(B)

For piping runs of more than 20 feet in length, beginning at the dispensers, at least one additional soil sample must be collected at each 20-foot interval.

(f)

For dispensers, at least one soil sample must be collected from the native soils directly beneath each dispenser;

(g)

For UST components (e.g., underground piping or dispensers) located directly above an area to be excavated, the area must be visually assessed before excavation work is conducted and soil samples collected if contamination is observed or suspected;

(h)

All soil samples must be analyzed by the Northwest Total Petroleum Hydrocarbon Identification Analytical Method (NWTPH-HCID, DEQ, December 1996)) test specified in OAR 340-122-0218 (Cleanup Rules for Leaking Petroleum UST Systems: Sampling and Analysis)(1)(d)(A) to determine if a confirmed petroleum release exists; and

(i)

If water is present in the UST pit, regardless of whether obvious contamination is present, DEQ must be notified within 24 hours of discovery.

(6)

The guidance contained in Appendix K of this division may be used to comply with sections (4) and (5) of this rule.

(7)

An owner and permittee must report a confirmed release to DEQ within 24 hours of confirmation by observance or receipt of analytical results. Upon discovery of a release, an owner and permittee must:

(a)

Immediately initiate corrective action. An owner and permittee may request and DEQ may approve a specific time schedule to initiate corrective action on a case-by-case basis depending on the severity of the contamination or other relevant factors; and

(b)

Follow the requirements of OAR 340-122-0225 (Cleanup Rules for Leaking Petroleum UST Systems: Initial Abatement Measures and Site Check) for “Initial Abatement and Site Check” and 340-122-0235 (Cleanup Rules for Leaking Petroleum UST Systems: Free Product Removal) for “Free Product Removal” as appropriate.

(8)

An owner and permittee must submit a written report of the results of the site assessment to DEQ within 30 days after completing the field work or other period DEQ approves.
[Note: View a PDF of referenced publications by clicking on “Tables” link below.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 340-150-0180 — Site Assessment Requirements, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-150-0180.

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 340-150-0180’s source at or​.us