OAR 340-150-0440
Manual Tank Gauging Release Detection Method

(1)

An owner and permittee may use manual tank gauging as a release detection method for USTs that are less than 2,001 gallons in size.

(a)

For USTs of 550 gallons or less nominal capacity and USTs with a nominal capacity of 551 to 1,000 gallons that meet the tank diameter criteria in the table may use this as the sole method of release detection.

(b)

For USTs of 551 to 2,000 gallons in size, this method may be used instead of manual inventory control (OAR 340-150-0430 (Inventory Control Method of Release Detection)). This method is allowed for a period of:

(A)

Ten years after the installation of the UST system; or

(B)

Ten years after the UST system achieved compliance with corrosion protection requirements; except

(C)

In no case may manual tank gauging be used as a primary release detection method after December 22, 2008.

(c)

After the period of use has expired as listed in paragraph (1)(b)(C) of this section, an owner and permittee of an UST between 551 and 2,000 gallons in size must use one of the release detection methods in OAR 340-150-0435 (Statistical Inventory Reconciliation Method of Release Detection) through 340-150-0470 (Other Methods of Release Detection).

(2)

An owner and permittee must use the following procedures for the manual tank gauging release detection method:

(a)

Tank liquid level measurements must be taken at the beginning and ending of a minimum 36-hour test period, during which time no liquid (i.e., regulated substance) may be added to or removed from the UST;

(b)

Level measurements must be based on an average of two consecutive measuring stick or automatic tank gauge readings at both the beginning and ending of the period in which the UST is tested; and

(c)

The equipment used to measure the level of regulated substance in the UST (e.g., stick or automatic tank gauge) must be capable of measuring the level of the regulated substance over the full range of the UST’s height to the nearest one-eighth of an inch.

(3)

An owner and permittee must monitor the UST system for releases at least weekly and record and reconcile the results of each week’s readings for each month.

(4)

In addition to any other requirements of this rule, an owner and permittee must conduct tightness testing (OAR 340-150-0445 (Tank Tightness Testing for Release Detection and Investigation)) of USTs of 1,001 to 2,000 gallons in size at least once every five years.

(5)

An owner and permittee must report to DEQ any variation between beginning and ending measurements that exceeds either the weekly or monthly standards in the table in 340-150-0440 (Manual Tank Gauging Release Detection Method)(1)(a) within 24 hours as a suspected release (OAR 340-150-0500 (Reporting Suspected Releases)) and immediately begin investigation as 340-150-0510 (Suspected Release Investigation and Confirmation Steps) specifies.

(6)

An owner and permittee must immediately investigate all larger-than-normal or reoccurring variations in results and report such variations to DEQ as a suspected release if the variation cannot be accounted for, without waiting to obtain a second week of data.

(7)

An owner and permittee must retain at a minimum the most current 12 consecutive months of release detection records and the last two tightness test results.
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 340-150-0440 — Manual Tank Gauging Release Detection Method, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-150-0440.

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 340-150-0440’s source at or​.us