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4.11.906    DETERMINING SIGNIFICANT PROBABILITY

(1)  For purposes of determining significant probability the department will obtain information during investigations or monitoring of agricultural chemical use, chemical spills, dumps, or misuse. Examples of information that will be considered are:

(a)  characteristics of the chemical that influences entry into ground water such as water solubility, half-life, absorption and adsorption;

(b)  depth to and direction of flow, volume and rate of ground water;

(c)  distance to existing wells or other conduits to ground water;

(d)  soil characteristics including depth, texture, organic matter and permeability;

(e)  amount of chemical used, spilled, dumped or otherwise available to enter ground water;

(f)  land features that could influence chemical movement such as surface water drainage;

(g)  precipitation;

(h)  cropping history and irrigation; and

(i)  other factors deemed appropriate by the department.

History: Sec. 80-15-105, MCA; IMP, Sec. 80-15-403 and 80-15-405, MCA; NEW, 1990 MAR p. 2244, Eff. 12/28/90.

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