90-429 C.M.R. ch. 1 , 429-1 app A

Treatment System Classification Point Values
Item	Points
Size ( 2 point minimum to 10 point maximum)
Maximum population (1 point minimum to 5 points maximum)	1 point per 10,000
Design flow average (1 point minimum to 5 points maximum)	1 point per MGD
Water Supply Sources
Groundwater	3
Groundwater under the influence of surface water	5
Surface Water	5
Chemical Treatment / Addition Processes
Fluoridation	5
Disinfection:
Chlorination	5
Chloramination	10
Chlorine dioxide	5
Ultraviolet light	5
Ozonation	10
pH adjustment (calcium carbonate, carbon dioxide, hydrochloric acid, calcium oxide, calcium hydroxide, sodium hydroxide, sulfuric acid, other)	5
Stability or corrosion control (calcium oxide, calcium hydroxide, sodiumor potassium carbonate, sodium hexametaphosphate, other)	5
Coagulation & Flocculation Process
Chemical addition (aluminum sulfate, bauxite, ferrous sulfate, ferric sulfate, calcium oxide, bentonite, calcium carbonate, carbon dioxide, sodium silicate, other)	1 point per chemical coagulant added (5 points max.)
Rapid mix units:
Mechanical mixers	3
Injection mixers	2
In-line blender mixers	2
Flocculation tanks:
Hydraulic flocculators	2
Mechanical flocculators	3
Clarification / Sedimentation Process
Horizontal Flow (rectangular basins)	5
Horizontal Flow (round basins)	7
Solid-contact	15
Inclined-plate, tube	10
Dissolved air flotation	30
Filtration Process
Single media filtration	3
Dual or mixed media filtration	5
Microscreens	5
Diatomaceous earth filters	5
Cartridge filters As pre-filter to another process As microbiological removal	2 5
Slow sand filters	5
Item	Points
Direct filtration	5
Pressure or greens and filtration	5
Other Treatment Processes
Aeration	3
Packed tower aeration	5
Ion exchange / softening (Cation, Anion, Adsorptive) To control Primary MCL contaminant To control secondary MCL contaminant	5 2
Adsorptive media	5
Lime - soda ash softening	5
Membrane filtration- reverse osmosis, micro, ultra, nano	10
Powdered activated carbon	5
Other Processes	0 to 15
Residuals Disposal
Discharge to lagoons	5
Discharge to lagoons and then raw water source	8
Discharge to raw water	10
Disposal to sanitary sewer	3
Mechanical dewatering	5
On-site disposal	5
Land application	5
Solids composting	5
Facility Characteristics
Instrumentation:
The use of SCADA or similar instrumentation to provide data with no process operation	0
The use of SCADA or similar instrumentation to provide data with limited process operation	2
The use of SCADA or similar instrumentation to provide data with moderate process operation	4
The use of SCADA or similar instrumentation to provide data with extensive or total process operation	6
Gravity Fed Systems Total atmospheric storage less than average day design flow	5

Notes

90-429 C.M.R. ch. 1 , 429-1 app A