Utah Admin. Code R309-525-5 - Plant Capacity and Number of Treatment Trains
(1) A determination of the required plant
capacity and the required number of treatment trains shall be made by the
Director after consultation with the Division. Ordinarily, a minimum of two
units each for flocculation, sedimentation and filtration must be provided. The
design shall provide for parallel or series operation of the clarification
stages. Flash mix shall be designed and operated to provide a minimum velocity
gradient of 750 fps/ft. Mixing time shall be less than thirty seconds. The
treatment plant shall be designed to meet the anticipated "peak day demand" of
the system being served when the treatment plant is the system's sole source.
When other sources are available to the system, this requirement may be
relaxed.
(2) The degree of
"back-up" required in a water treatment plant will vary with the number of
connections to be served, the availability of other acceptable sources of
water, and the ability to control water consumption. Thus, when other sources
are available to the system, the requirements of
R309-525-7 (Plant Reliability) may also be relaxed. The Division shall be consulted in
this regard prior to plant design.
Notes
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