Administrative Code

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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 580. Underground Storage Tanks: Technical Standards and Corrective Action Requirements

9VAC25-580-150. Requirements for hazardous substance UST systems.

Owners and operators of hazardous substance UST systems must provide containment that meets the following requirements and monitor these systems using subdivision 7 of 9VAC25-580-160 at least every 30 days:

1. Secondary containment systems must be designed, constructed and installed to:

a. Contain regulated substances leaked from the primary containment until they are detected and removed;

b. Prevent the release of regulated substances to the environment at any time during the operational life of the UST system; and

c. Be checked for evidence of a release at least every 30 days.

NOTE: The provisions of 40 CFR 265.193, Containment and Detection of Releases, may be used to comply with these requirements for tanks installed before September 15, 2010.

2. Double-walled tanks must be designed, constructed, and installed to:

a. Contain a leak from any portion of the inner tank within the outer wall; and

b. Detect the failure of the inner wall.

3. External liners (including vaults) must be designed, constructed, and installed to:

a. Contain 100% 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).

4. Underground piping must be equipped with secondary containment that satisfies the requirements of this section (e.g., trench liners, 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 subdivision 1 of 9VAC25-580-170.

5. For hazardous substance UST systems installed before September 15, 2010, other methods of release detection may be used if owners and operators:

a. Demonstrate to the department that an alternate method can detect a release of the stored substance as effectively as any of the methods allowed in subdivisions 2 through 9 of 9VAC25-580-160 can detect a release of petroleum;

b. Provide information to the department on effective corrective action technologies, health risks, and chemical and physical properties of the stored substance, and the characteristics of the UST site; and

c. Obtain approval from the department to use the alternate release detection method before the installation and operation of the new UST system.

Statutory Authority

§§ 62.1-44.15 and 62.1-44.34:9 of the Code of Virginia; 42 USC § 6901 et seq.; 40 CFR Parts 280 and 281.

Historical Notes

Derived from VR680-13-02 § 4.3, eff. October 25, 1989; amended, Virginia Register Volume 34, Issue 1, eff. January 1, 2018; Errata, 34:4 VA.R. 503 October 16, 2017; amended, Virginia Register Volume 39, Issue 5, eff. November 23, 2022.

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