NAC445A.531. Inclusion of features for reliability in design and construction of plant.

The following features for reliability or alternatives acceptable to the Division or the appropriate district board of health must be included in the design and construction of any plant that treats surface water or groundwater under the direct influence of surface water:

     1. Alarm devices to indicate failures in the coagulation, filtration and disinfection processes. The alarm must notify the person designated by the public water system as responsible for taking corrective action and, if the facility is unmanned, have the capability to shut the plant down until corrective action can be taken.

     2. Standby replacement equipment to ensure continuous operation and control of unit processes for coagulation, filtration and disinfection.

     3. Multiple filter units to provide redundant capacity if filters are out of service for backwash or maintenance.

     4. Multiple ultraviolet light reactors, if used to meet the requirements of NAC 445A.520, to provide redundant capacity if a reactor is out of service for maintenance.

     (Added to NAC by Bd. of Health, eff. 11-29-90; A by Environmental Comm’n by R126-05, 10-31-2005; R194-08, 10-27-2009)