Section 173-360-380. Temporary closure of UST systems.

(1) When an UST system is temporarily closed, owners and operators shall continue operation and maintenance of corrosion protection in accordance with WAC 173-360-320, and any release detection in accordance with WAC 173-360-330 through 173-360-355. WAC 173-360-360 through 173-360-375 and 173-360-399 shall 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.

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

(a) Leave vent lines open and functioning; and

(b) Cap and secure all other lines, pumps, entryways, and ancillary equipment.

(3) Any UST system temporarily closed for three months or more shall be tightness tested by a certified UST supervisor in accordance with WAC 173-360-345 (6)(d) and 173-360-350 (3)(b) prior to being put back into service unless the system is subject to and in compliance with the release detection requirements of WAC 173-360-330.

(4) When an UST system is temporarily closed for more than twelve months, owners and operators shall have a certified UST supervisor permanently close the UST system if it does not either meet the performance standards in WAC 173-360-305 for new UST systems or the upgrading requirements in WAC 173-360-310 (2) and (3). Such UST systems shall be permanently closed in accordance with WAC 173-360-385 through 173-360-398 at the end of the twelve-month period unless the department or delegated agency provides an extension before expiration of the twelve-month temporary closure period. Owners and operators shall have a site assessment completed in accordance with WAC 173-360-390 before such an extension is applied for.

(5) Any active permits for those systems being temporarily closed shall be returned to the department within thirty days of completion of the temporary closure activities.

[Statutory Authority: Chapter 90.76 RCW. WSR 95-04-102, § 173-360-380, filed 2/1/95, effective 3/4/95; WSR 91-22-020 (Order 91-26), § 173-360-380, filed 10/29/91, effective 11/29/91; WSR 90-24-017, § 173-360-380, filed 11/28/90, effective 12/29/90.]

Chapter 90.76 RCW. WSR 95-04-102, § 173-360-380, filed 2/1/95, effective 3/4/95; WSR 91-22-020 (Order 91-26), § 173-360-380, filed 10/29/91, effective 11/29/91; WSR 90-24-017, § 173-360-380, filed 11/28/90, effective 12/29/90.

Rules

173-360-320,173-360-330,173-360-355,173-360-360,173-360-375,173-360-399,173-360-345,173-360-350,173-360-330,173-360-305,173-360-310,173-360-385,173-360-398,173-360-390,