Utah Administrative Code
Topic - Environmental Quality
Title R317 - Water Quality
Rule R317-6 - Ground Water Quality Protection
Section R317-6-4 - Ground Water Class Protection Levels
Universal Citation: UT Admin Code R 317-6-4
Current through Bulletin 2024-06, March 15, 2024
4.1 GENERAL
A. Protection levels are ground water
pollutant concentration limits, set by ground water class, for the operation of
facilities that discharge or would probably discharge to ground
water.
B. For the physical
characteristics (color, corrosivity, odor, and pH) and radionuclides listed in
Table 1, the values listed are the protection levels for all ground water
classes.
4.2 CLASS IA PROTECTION LEVELS
A. Class IA ground water
will be protected to the maximum extent feasible from degradation due to
facilities that discharge or would probably discharge to ground
water.
B. The following protection
levels will apply:
1. Total dissolved solids
may not exceed the greater of 1.25 times the background or background plus two
standard deviations.
2. When a
contaminant is not present in a detectable amount as a background
concentration, the concentration of the pollutant may not exceed the greater of
0.1 times the ground water quality standard value, or the limit of
detection.
3. When a contaminant is
present in a detectable amount as a background concentration, the concentration
of the pollutant may not exceed the greater of 1.25 times the background
concentration, 0.25 times the ground water quality standard, or background plus
two standard deviations; however, in no case will the concentration of a
pollutant be allowed to exceed the ground water quality standard.
4.3 CLASS IB PROTECTION LEVELS
A. Class IB ground water will be
protected as an irreplaceable source of drinking water.
B. The following protection levels will
apply:
1. Total dissolved solids may not
exceed the lesser of 1.1 times the background value or 2000mg/l.
2. When a contaminant is not present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 0.1 times the ground water quality
standard, or the limit of detection.
3. When a contaminant is present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 1.1 times the background concentration
or 0.1 times the ground water quality standard; however, in no case will the
concentration of a pollutant be allowed to exceed the ground water quality
standard.
4.4 CLASS IC PROTECTION LEVELS
Class IC ground water will be protected as a source of water for potentially affected wildlife habitat. Limits on increases of total dissolved solids and organic and inorganic chemical compounds will be determined in order to meet applicable surface water standards.
4.5 CLASS II PROTECTION LEVELS
A. Class II ground water will be protected
for use as drinking water or other similar beneficial use with conventional
treatment prior to use.
B. The
following protection levels will apply:
1.
Total dissolved solids may not exceed the greater of 1.25 times the background
value or background plus two standard deviations.
2. When a contaminant is not present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 0.25 times the ground water quality
standard, or the limit of detection.
3. When a contaminant is present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 1.25 times the background
concentration, 0.25 times the ground water quality standard, or background plus
two standard deviations; however, in no case will the concentration of a
pollutant be allowed to exceed the ground water quality standard.
4.6 CLASS III PROTECTION LEVELS
A. Class III ground water
will be protected as a potential source of drinking water, after substantial
treatment, and as a source of water for industry and agriculture.
B. The following protection levels will
apply:
1. Total dissolved solids may not
exceed the greater of 1.25 times the background concentration level or
background plus two standard deviations.
2. When a contaminant is not present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 0.5 times the ground water quality
standard, or the limit of detection.
3. When a contaminant is present in a
detectable amount as a background concentration, the concentration of the
pollutant may not exceed the greater of 1.5 times the background concentration
or 0.5 times the ground water quality standard or background plus two standard
deviations; however, in no case will the concentration of a pollutant be
allowed to exceed the ground water quality standard. If the background
concentration exceeds the ground water quality standard no increase will be
allowed.
4.7 CLASS IV PROTECTION LEVELS
Protection levels for Class IV ground water will be established to protect human health and the environment.
Disclaimer: These regulations may not be the most recent version. Utah may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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