Utah Administrative Code
Topic - Environmental Quality
Title R309 - Drinking Water
Rule R309-505 - Facility Design and Operation: Minimum Treatment Requirements
Section R309-505-7 - Low Quality Ground Water Sources
Universal Citation: UT Admin Code R 309-505-7
Current through Bulletin 2024-06, March 15, 2024
(1) Determination of a Low Quality Ground Water Source.
(a) A low quality ground water
source is any well or spring which, as determined by the Director, cannot
reliably and consistently meet the drinking water quality standards described
in R309-200. A water source shall be deemed to be a low quality ground water
source if any of the following conditions exist:
(i) It is determined by the Director that the
source is Ground Water Under the Direct Influence of Surface Water.
(A) Classification of existing ground water
sources, as to whether or not they are under direct influence of surface water,
shall be made by the Director.
(B)
Frequent monitoring of turbidity, temperature, pH and conductivity of source
water, in conjunction with similar monitoring of nearby surface waters may, if
properly documented, provide sufficient evidence that the source is not
influenced.
(C) Classification of
existing sources shall be based upon evaluation of part or all of the
following:
(I) Records review; including
review of plans and specifications used for construction of collection
facilities as submitted for review and approval prior to construction; review
of as-built plans as submitted after construction, especially where springs are
concerned; review of previous sanitary surveys; and review of any system
bacteriological violations which may be linked directly to a source.
(II) Results of written survey
form.
(III) On-site inspection by
Division personnel.
(IV) Special
tests such as Microscopic Particulate Analysis (MPA), dye tracer studies, or
time of travel studies done in conjunction with the source protection program.
Because of critical timing for tests such as the MPA, accelerated monitoring
and reporting of water characteristics as mentioned in R309-505-7(1)(a)(i)(B)
above, may be required prior to MPA sampling.
(b) Testing for microbiological,
chemical or radiologic contaminants determines that the drinking water quality
requirements of R309-200 cannot be reliably or consistently met.
(c) The location, design or construction of
the well or spring makes it, in the judgement of the Director, susceptible to
natural or man-caused contamination.
(2) Treatment of a Low Quality Ground Water Source.
Low quality ground water sources shall be treated to assure that all chemical and biological contaminants are reduced to the levels which are reliably and consistently below MCL's prescribed in R309-200. If a source is determined to be ground water under the direct influence of surface water the following is required:
(a) Upon
determination that a ground water source is under the direct influence of
surface water, conventional surface water treatment, as specified in
R309-525,or an approved equivalent, as specified in R309-530, shall be
installed within 18 months or the source must be abandoned as a source of
drinking water and physically disconnected from the drinking water
system.
(b) Systems which must
retain use of ground water sources classified as under direct influence of
surface water shall start disinfection immediately on those sources and monitor
in accordance with residual disinfectant monitoring under treatment plant
monitoring and reporting found in R309-215- as well as maintain satisfactory
"CT" values in accordance with
R309-200-5(7)
during the 18 month interim period before conventional surface water treatment,
or an approved equivalent, is installed. Chlorine, chlorine dioxide,
chloramine, and ozone are considered capable of attaining required levels of
disinfection.
(c) Once a ground
water source is classified as under the influence of surface water, it must be
considered to be a surface water source. Thus, all requirements in these rules
which pertain to surface water sources also pertain to ground water under the
direct influence of surface water.
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