S.D. Admin. R. 74:56:01:30 - Release detection requirements - Secondary containment with interstitial monitoring

Interstitial monitoring between the UST system and a secondary barrier immediately around it may be used as a release detection method if the following conditions are met:

(1) The secondary barrier is designed, constructed, and installed to ensure detection of any release from the UST system so that corrective action can be taken;

(2) For double-walled UST systems, the sampling or testing method is capable of detecting a release through the inner wall;

(3) For UST systems with a secondary barrier within the excavation area, the sampling or testing method used is capable of detecting any release within the area between the UST system and the secondary barrier and the secondary barrier meets the following conditions:

(a) The secondary barrier around the UST system consists of native soils or artificially constructed material that is sufficiently thick and impermeable (at least 10^-6 centimeters per second) to permit containment and detection of a release;

(b) The liner or barrier is compatible with the regulated substance stored so that a release from the UST system will not cause a deterioration of the barrier;

(c) The groundwater, soil moisture, or rainfall will not render the testing or sampling method that is used inoperative so that a release could go undetected for more than 30 days;

(d) The site is assessed to ensure that the secondary barrier is always above the groundwater and not in a 25-year flood plain, unless the barrier and monitoring designs are for use under such conditions; and

(e) Monitoring wells are clearly marked and secured to avoid unauthorized access and tampering;

(4) For tanks with an internally fitted liner, an automated device can detect a release between the liner wall of the tank and the liner, and the liner is compatible with the substance stored.

Notes

S.D. Admin. R. 74:56:01:30

14 SDR 76, effective 11/29/1987; transferred from

General Authority: SDCL 34A-2-93, 34A-2-99.

Law Implemented: SDCL 34A-2-98, 34A-2-99.