S.D. Admin. R. 74:56:01:28

Current through Register Vol. 51, page 34, September 9, 2024

Section 74:56:01:28 - Release detection requirements - Groundwater monitoring

Testing or monitoring for liquids on the groundwater may be used as a release detection method if the following conditions are met:

(1) The regulated substance stored in the UST system must be immiscible in water and have a specific gravity of less than one;

(2) The groundwater may never be more than 20 feet from the ground surface and the hydraulic conductivity of the soils between the UST system and the monitoring wells or devices may not be less than 0.01 cm/sec. (For example, the soil should consist of gravels, coarse to medium sands, coarse silts, or other permeable materials);

(3) All the monitoring wells or devices must be placed in the backfill or as close to it as technically feasible, and the continuous monitoring devices or manual methods that are used must be able to detect the presence of at least 1/8 inch of free product on top of the groundwater in the monitoring wells;

(4) The slotted portion of the monitoring well casing must be designed to prevent migration of natural soils or filter pack into the well and to allow entry of regulated substance on the water table into the well under both high and low groundwater conditions;

(5) Monitoring wells shall be sealed from the ground surface to the top of the filter pack;

Within and immediately below the UST system excavation area, the site shall be assessed before installation of the system to ensure that the number and positioning of the monitoring wells or devices in the excavation area will detect releases from any portion of the UST system. Monitoring wells shall be clearly marked and secured to avoid unauthorized access and tampering.

S.D. Admin. R. 74:56:01:28

14 SDR 76, effective 11/29/1987; transferred from § 74:03:28:11, 18 SDR 62, effective 10/10/1991; transferred from § 74:03:28:11.03, July 1, 1996; 44 SDR 192, effective 6/28/2018

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

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