Rules & Regulations of the State of Tennessee
Title 0400 - Environment and Conservation
Subtitle 0400-18 - Division of Petroleum Underground Storage Tanks
Chapter 0400-18-01 - Underground Storage Tanks Program
Section 0400-18-01-.17 - UST SYSTEMS WITH FIELD-CONSTRUCTED TANKS AND AIRPORT HYDRANT SYSTEMS

Universal Citation: TN Comp Rules and Regs 0400-18-01-.17

Current through September 24, 2024

(1) General requirements.

(a) Except as provided in paragraph (2) of this rule, owners and/or operators of UST systems with field-constructed tanks and airport hydrant systems installed on or before the effective date of this rule must comply with the requirements of:
1. Rules 0400-18-01-.02 through 0400-18-01-.04 and 0400-18-01-.06 and 0400-18-01-.08 and 0400-18-01-.16 and 0400-18-01-.17 no later than three years after the effective date of this rule except owners and/or operators may comply prior to such date; and

2. Rules 0400-18-01-.05 and 0400-18-01-.07 no later than the effective date of this rule.

(b) For owners and/or operators of UST systems with field-constructed tanks and airport hydrant systems installed after the effective date of this rule, the requirements of the rules listed in subparagraph (a) of this rule apply at installation.

(c) No later than three years after the effective date of this rule, all owners of UST systems with field-constructed tanks and airport hydrant systems in use as of the effective date of this rule must submit a one-time notice of tank system existence to the Division in accordance with subparagraphs (1)(b) and (c) of Rule 0400-18-01-.03 in a format established by the Division and in accordance with instructions provided by the Division. Owners and/or operators of UST systems in use as of the effective date of this rule must demonstrate financial responsibility at the time of submission of the notification form.

(d) Owners and/or operators of UST systems with field-constructed tanks and airport hydrant systems may use military construction criteria, such as Unified Facilities Criteria (UFC) 3-460-01, Petroleum Fuel Facilities, when designing, constructing, and installing airport hydrant systems and UST systems with field-constructed tanks.

(2) Additions, exceptions, and alternatives for UST systems with field-constructed tanks and airport hydrant systems.

(a) Exception to piping secondary containment requirements. Owners and/or operators may use single walled piping when installing or replacing piping associated with UST systems with field-constructed tanks greater than 50,000 gallons and piping associated with airport hydrant systems. Piping associated with UST systems with field-constructed tanks less than or equal to 50,000 gallons not part of an airport hydrant system must meet the secondary containment requirement when installed or replaced.

(b) Upgrade requirements. No later than three years after the effective date of this rule, airport hydrant systems and UST systems with field-constructed tanks where installation commenced on or before the effective date of this rule must be in compliance with the following requirements or be permanently closed in accordance with the closure procedures in Rule 0400-18-01-.07:
1. Corrosion protection. UST system components in contact with the ground that routinely contain petroleum substances must meet one of the following:
(i) Except as provided in subparagraph (a) of this paragraph, the new UST system performance standards for tanks in subparagraph (4)(a) of Rule 0400-18-01-.02 and for piping in subparagraph (4)(b) of Rule 0400-18-01-.02; or

(ii) Be constructed of metal and cathodically protected according to a code of practice developed by a nationally recognized association or independent testing laboratory and meets the following:
(I) Cathodic protection must meet the requirements of subparts (4)(a)2.(ii), (iii) and (iv) of Rule 0400-18-01-.02 for tanks and subparts (4)(b)2.(ii), (iii), and (iv) of Rule 0400-18-01-.02 for piping.

(II) Tanks greater than ten years old without cathodic protection must be assessed to ensure the tank is structurally sound and free of corrosion holes prior to adding cathodic protection. The assessment must be by internal inspection or another method determined by the division to adequately assess the tank for structural soundness and corrosion holes.

2. Spill and overfill prevention equipment. To prevent spilling and overfilling associated with product transfer to the UST system, all UST systems with field-constructed tanks and airport hydrant systems must comply with new UST system spill and overfill prevention equipment requirements specified in paragraph (3) of Rule 0400-18-01-.02.

(c) Walkthrough inspections. In addition to the walkthrough inspection requirements in paragraph (8) of Rule 0400-18-01-.02, owners and/or operators must inspect the following additional areas for airport hydrant systems at least once every 30 days if confined space entry according to the Occupational Safety and Health Administration (see 29 C.F.R. part 1910) is not required or at least annually if confined space entry is required and keep documentation of the inspection according to paragraph (8) of Rule 0400-18-01-.02.
1. Hydrant pits - visually check for any damage; remove any liquid or debris; and check for any leaks, and

2. Hydrant piping vaults - check for any hydrant piping leaks.

(d) Release detection. On or before three years after the effective date of this rule, owners and/or operators of UST systems with field-constructed tanks and airport hydrant systems must begin meeting the release detection requirements described in this subparagraph.
1. Methods of release detection for field-constructed tanks. Owners and/or operators of field-constructed tanks with a capacity less than or equal to 50,000 gallons must meet the release detection requirements in Rule 0400-18-01-.04. Owners and/or operators of field-constructed tanks with a capacity greater than 50,000 gallons must meet either the requirements in Rule 0400-18-01-.04 or use one or a combination of the following alternative methods of release detection:
(i) Conduct an annual tank tightness test that can detect a 0.5 gallon per hour leak rate;

(ii) Use an automatic tank gauging system to perform release detection at least every 30 days that can detect a leak rate less than or equal to one gallon per hour. This method must be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every three years;

(iii) Use an automatic tank gauging system to perform release detection at least every 30 days that can detect a leak rate less than or equal to two gallons per hour. This method must be combined with a tank tightness test that can detect a 0.2 gallon per hour leak rate performed at least every two years;

(iv) Another method approved by the Division if the owner and/or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in part (d)1.(i) through (iii) of this paragraph. In comparing methods, the Division shall consider the size of release that the method can detect and the frequency and reliability of detection.

2. Methods of release detection for piping. Owners and/or operators of underground piping associated with field-constructed tanks less than or equal to 50,000 gallons must meet the release detection requirements in Rule 0400-18-01-.04. Owners and/or operators of underground piping associated with airport hydrant systems and field-constructed tanks greater than 50,000 gallons must follow either the requirements in Rule 0400-18-01-.04 or use one or a combination of the following alternative methods of release detection:
(i) Perform a semiannual or annual line tightness test at or above the piping operating pressure in accordance with the table below:

Maximum Leak Detection Rate Per Test Section Volume

Test section volume (gallons)

Semiannual test - leak detection rate not to exceed (gallons per hour)

Annual test - leak detection rate not to exceed (gallons per hour)

<50,000

1.0

0.5

>=50,000 to <75,000

1.5

0.75

>=75,000 to <100,000

2.0

1.0

>=100,000

3.0

1.5

(ii) Piping segment volumes & 100,000 gallons not capable of meeting the maximum 3 gallon per hour leak rate for the semiannual test or maximum 1.5 gallon per hour leak rate for the annual test may be tested at a leak rate up to 6 gallons per hour according to the following schedule:

PHASE IN FOR PIPING SEGMENTS >=100,000 GALLONS IN VOLUME

First test

No later than three years after the effective date of this rule (may use up to 6.0 gph leak rate)

Second test

Between three years after the effective date of this rule and six years after the effective date of this rule (may use up to 6.0 gph leak rate)

Third test

Between six years after the effective date of this rule and seven years after the effective date of this rule (must use 3.0 gph for leak rate)

Subsequent tests

After seven years after the effective date of this rule, begin using semiannual or annual line testing according to the Maximum Leak Detection Rate Per Test Section Volume table in subpart (i) of this part.

(iii) Another method approved by the Division if the owner and/or operator can demonstrate that the method can detect a release as effectively as any of the methods allowed in subparts (i) and (ii) of this part. In comparing methods, the Division shall consider the size of release that the method can detect and the frequency and reliability of detection.

3. Recordkeeping for release detection. Owners and/or operators must maintain release detection records according to the recordkeeping requirements in paragraph (5) of Rule 0400-18-01-.04.

(e) Applicability of closure requirements to previously closed UST systems. When directed by the Division, the owner and/or operator of an UST system with field-constructed tanks or airport hydrant systems permanently closed before three years after the effective date of this rule must assess the excavation zone and close the UST system in accordance with the closure procedures in Rule 0400-18-01-.07 if releases from the UST may, in the judgment of the Division, pose a current or potential threat to human health and the environment.

Authority: T.C.A. §§ 4-5-201, et seq. and 68-215-101, et seq.

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