Cite as [A.S.A.C. § 24.0741]
Owners and operators of petroleum UST systems must provide release detection for tanks and piping as follows:
(1) Tanks. Tanks must be monitored at least every 30 days for releases using one of the methods listed in 24.0742(4) through (8) except that:
(A) UST systems that meet the performance standards in 24.0710 or 24.0711, and the monthly inventory control requirements in 24.0742(1) or (2), may use tank tightness testing (conducted in accordance with 24.0742(3) at least every 5 years until December 22, 1998, or until 10 years after the tank is installed or upgraded under 24.0711(b), whichever is later;
(B) UST systems that do not meet the performance standards in 24.0710 or 24.0711 may use inventory controls (conducted in accordance with 24.0742(1) or (2) and annual tank tightness testing (conducted in accordance with 24.0742(3) until December 22,1998 when the tank must be upgraded under 24.0711 or permanently closed under 24.0770; and
(C) Tanks with capacity of 550 gallons or less may use weekly tank gauging (conducted in accordance with 24.0742(2).
(2) Piping. Underground piping that routinely contains regulated substance must be monitored for releases in a manner that meets one of the following requirements:
(A) Pressurized piping. Underground piping that conveys regulated substances under pressure must:
(i) Be equipped with an automatic line leak detector conducted in accordance with 24.0743 (1); and
(ii) Have an annual line tightness test conducted in accordance with 24.0743(2) or have monthly monitoring conducted in accordance with 24.0743(3).
(B) Suction piping. Underground piping that conveys regulated substances under must either have a line tightness test conducted at least every 3 years and in accordance with 24.0743(2), or use a monthly monitoring method conduct in accordance with 24.0743(3).No releases detection is required for suction piping that is designed and constructed to meet the following standards:
(i) The below-grade piping operates at less than atmospheric pressure;
(ii) The below-grade piping is slope so that the contents of the pipe will drain back into the storage tank if the suction is released;
(iii) Only one check valve is included in each suction line;
(iv) The check valve is located directly below and as close as practical to the suction pump; and
(v) A method is provided that allows compliance with paragraphs (2)(B)(iii) through (iv) of this section to be readily determined.History: Rule 3-01, eff 30 Aug 01.