Special definitions.

§ 503.21 Special definitions.

(a) Active sewage sludge unit is a sewage sludge unit that has not closed.

(b) Aquifer is a geologic formation, group of geologic formations, or a portion of a geologic formation capable of yielding ground water to wells or springs.

(c) Contaminate an aquifer means to introduce a substance that causes the maximum contaminant level for nitrate in 40 CFR 141.62(b) to be exceeded in the ground water or that causes the existing concentration of nitrate in ground water to increase when the existing concentration of nitrate in the ground water exceeds the maximum contaminant level for nitrate in 40 CFR 141.62(b).

(d) Cover is soil or other material used to cover sewage sludge placed on an active sewage sludge unit.

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