S.D. Admin. R. 74:11:08:03.01

Current through Register Vol. 51, page 56, November 4, 2024

Section 74:11:08:03.01 - Definitions

Terms defined by SDCL chapters 45-6 C and 45-6D have the same meanings when used in this chapter. In addition, terms used in this chapter mean:

(1) "Bedrock," any geologic formation or sediment of Pliocene age or older of solid unweathered rock, including solid limestone, dolomite, sandstone, shale, and igneous and metamorphic rocks;

(2) "Bentonite," a highly plastic when wet, colloidal clay composed primarily of sodium montmorillonite;

(3) "Bentonite chips," angular fragments of bentonite that have been commercially processed and graded according to size for use in plugging test holes. The fragments range in size from 1/4 to 3/4-inch;

(4) "Bentonite grout," a mixture consisting of water and a high solids, bentonite material, that has been commercially manufactured and specially formulated for use to plug a test hole. The bentonite grout must contain a minimum of 20 percent solids by weight and have a minimum slurry density of 9.4 pounds per gallon when mixed according to the manufacturer's recommendations. Bentonite manufactured for use as a drilling fluid does not meet the requirements for bentonite grout;

(5) "Cement grout," a mixture consisting of a high-sulfate-resistant type Portland cement and no more than six gallons of water for each 94-pound sack of cement, and which may have up to 75 pounds of drilling-grade bentonite per 10 sacks of cement to reduce shrinkage;

(6) "Confined aquifer," an aquifer in which the groundwater is isolated from the atmosphere by geologic formations of low permeability and that produces water levels above the top of the aquifer in test holes penetrating it;

(7) "Flowing artesian test hole," a test hole that has penetrated a confined aquifer whose potentiometric surface is above the land surface resulting in water flow at the surface;

(8) "Formation pressure," the fluid pressure within an aquifer or formation; and

(9) "Top of the aquifer," the uppermost point at which saturated conditions are found.

S.D. Admin. R. 74:11:08:03.01

34 SDR 323, effective 7/2/2008.

General Authority: SDCL 45-6C-29, 45-6D-34.

Law Implemented: SDCL 45-6C-29, 45-6D-34.