R317-6-3. Ground Water Classes

3.1 GENERAL The following ground water classes are established: Class IA - Pristine Ground Water; Class IB - Irreplaceable Ground Water; Class IC - Ecologically Important Ground Water; Class II - Drinking Water Quality Ground Water; Class III - Limited Use Ground Water; Class IV - Saline Ground Water. 3.2 CLASS IA - PRISTINE GROUND WATER Class IA ground water has the following characteristics: A. Total dissolved solids of less than 500 mg/l. B. No contaminant concentrations that exceed the ground water quality standards listed in Table 1. 3.3 CLASS IB - IRREPLACEABLE GROUND WATER Class IB ground water is a source of water for a community public drinking water system for which no reliable supply of comparable quality and quantity is available because of economic or institutional constraints. 3.4 CLASS IC - ECOLOGICALLY IMPORTANT GROUND WATER Class IC ground water is a source of ground water discharge important to the continued existence of wildlife habitat. 3.5 CLASS II - DRINKING WATER QUALITY GROUND WATER Class II ground water has the following characteristics: A. Total dissolved solids greater than 500 mg/l and less than 3000 mg/l. B. No contaminant concentrations that exceed ground water quality standards in Table 1. 3.6 CLASS III - LIMITED USE GROUND WATER Class III ground water has one or both of the following characteristics: A. Total dissolved solids greater than 3000 mg/l and less than 10,000 mg/l, or; B. One or more contaminants that exceed the ground water quality standards listed in Table 1. 3.7 CLASS IV - SALINE GROUND WATER Class IV ground water has total dissolved solids greater than 10,000 mg/l.