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24.0771 Temporary closure.

Cite as [A.S.A.C. § 24.0771]

(a) When a UST system is temporarily closed, owners and operators must continue operation and maintenance of corrosion protection in accordance with 24.0721, and any release detection in accordance with Subchapter E. Subchapter F must be complied with if a release is suspected or confirmed. However, release detection is not required as long as the UST system is empty. The UST system is empty when all materials have been removed using commonly employed practices so that no more than 2.5 centimeters (one inch) of residue, or 0.3 percent by weight of the total capacity of the UST system, remain in the system

(b) When an UST system is temporarily closed for 3 months or more, owners and operators must also comply with the following requirements:

(1) Leave vent lines open and functioning; and

(2) Cap and secure all the other lines, pumps, manways, and ancillary equipment.

(c) When an UST system is temporarily closed for more than 12 months, owners and operators must permanently close the UST system if it does not meet either performance standards in 24.0710 for new UST systems or the upgrading requirements in 24.0711 except that the spill and overfill equipment requirements do not have to be met. Owners and operators must permanently close the substandard UST systems at the end of this 12-months in accordance with 24.0770, unless the implementing agency provides an extension of the 12-month temporary closure period. Owners and operators must complete a site assessment in accordance with 24.0772 before such an extension can be applied for.

(d) The owner and operator must tag the fill pipe and pipe and pump of the UST system in temporary closure with a status label issued by the implementing agency.

History: Rule 3-01, eff 30 Aug 01.