Mo. Code Regs. Ann. tit. 10, § 20-10.070
Temporary Closure
Effective Sep 28, 1990sections 319.111, RSMo (Cum. Supp. 1989) and 644.026, RSMo (Cum. Supp. 1993).* Original rule filed April 2, 1990, effective Sept. 28, 1990. *Original authority: 319.111, RSMo (1989) and 644.026, RSMo (1972), amended 1973, 1987, 1993Clean Water Commission
PURPOSE: This rule contains the procedures for placing underground storage tanks out of service or temporarily closing underground storage tanks.
- (1) When an underground storage tank (UST) system is temporarily closed, owners and operators must continue operation and maintenance of corrosion protection in 10 CSR 20-10.031 and release detection in 10 CSR 20-10.040—10 CSR 20-10.045. Release reporting, investigation and corrective action in 10 CSR 20-10.050—10 CSR 20-10.067 must be performed if a release is suspected or confirmed. If the UST system is empty, release detection is not required. The UST system is empty when all materials have been removed so that no more than one inch (1”) (or two and one-half (2.5) centimeters) of residue or three-tenths percent (0.3%) by weight of the total capacity of the UST system remains.
(2) Owners and operators must also comply with the following requirements when a UST system is temporarily closed for three (3) months or more:
- (A) Leave vent lines open and functioning; and
- (B) Cap and secure all other lines, pumps, manways and ancillary equipment.
- (3) When a UST system is temporarily closed for more than twelve (12) months, owners and operators must permanently close the UST system if it does not meet either performance standards in 10 CSR 20-10.020 for new UST systems or the upgrading requirements in 10 CSR 20-10.021 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 twelve (12)-month period in accordance with 10 CSR 20- 10.071—10 CSR 20-10.074, unless the department provides an extension of the twelve (12)-month temporary closure period. Owners and operators must complete a site assessment in accordance with 10 CSR 20- 10.072 before such an extension can be applied for.
AUTHORITY: sections 319.111, RSMo (Cum. Supp. 1989) and 644.026, RSMo (Cum. Supp. 1993).* Original rule filed April 2, 1990, effective Sept. 28, 1990. *Original authority: 319.111, RSMo (1989) and 644.026, RSMo (1972), amended 1973, 1987, 1993.