Regulated System Record
The current classification scoring system for the selected facility is shown below.
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|
Selawik Water Treatment System |
|
Selawik |
|
Selawik, City of |
|
Water Treatment |
|
Class 2 |
Water treatment systems are classified according to a point rating system. Point values are
recognized for each of the various components found in a treatment plant. Points are totaled
once all components have been recognized. The total number of points determines the classification of
the water treatment system.
Click here to view the entire list of components for which points can be counted for water treatment.
The specific components that have been recognized toward the classification of this water treatment
system are as follows:
| Size (Peak day design capacity, gallons per day) - 10,000 - 50,000 | 2 |
| Water Supply Source - Surface water | 6 |
| Pretreatment - Roughing filter: Non-backwashable strainer or filter | 2 |
| Pretreatment - Add-heat system to heat raw water | 2 |
| Adjustment and Corrosion Control - pH adjustment | 3 |
| Coagulation - Primary coagulant | 5 |
| Coagulation - Coagulant aid, flocculent, or filter aid (3 each up to 12) | 3 |
| Mixing - Mechanical mixers | 5 |
| Mixing - In-line static mixers | 0 |
| Flocculation - Mechanical flocculator | 8 |
| Sedimentation - Tube settlers | 2 |
| Filtration - Granular media | 8 |
| Disinfection - Liquid and powdered hypochlorites | 3 |
| Disinfection - Additional points if hypochlorites are generated on-site | 2 |
| Sludge Treatment - Discharge to sewer or other off-site treatment | 0 |
| Storage - Water storage tank, for achieving CT | 3 |
|
1-30 |
Class 1 |
|
31-55 |
Class 2 |
|
56-75 |
Class 3 |
|
>75 |
Class 4 |
Operators:
For more information, please review the Water and Wastewater Operator Certification
and Training Regulation (18 AAC 74).
