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(a) Water and wastewater systems designated in 18 AAC 74.006 are classified as set out in this subsection in Tables B and C.
TABLE B - CLASSIFICATION RATING SYSTEM COLLECTION AND DISTRIBUTION SYSTEMS (By Range of Points) System Type I II III IV Wastewater Collection System 1-34 35-58 59-77 78 and above Water Distribution System 1-34 35-58 59-77 78 and above
TABLE C - CLASSIFICATION RATING SYSTEM TREATMENT SYSTEMS (By Range of Points) System Type I II III IV Wastewater Treatment System 1-30 31-55 56-75 76 and above Water Treatment System 1-30 31-55 56-75 76 and above
(b) The department will, in its discretion, and after considering advice of the board, modify the rating system in (a) of this section as applied to a particular system if the department finds that there are unusual factors affecting the complexity of unit processes, quality of raw water sources, users of water downstream from wastewater system discharges, or potential health hazards.
(c) To classify water treatment systems under (a) of this section, the department will use the following point system:
Item Points Size a Maximum population served, peak day 1 point per 10,000 or part Design flow (average day) or peak month's production (average day) whichever is larger 1 point per 1.0 million gallons per day or part Water Supply Source Groundwater 3 - 5 b Surface water 4 - 7 b Adjustment pH adjustment, stability, corrosion control 7 Aeration 3 Ion exchange, catalytic adsorption 10 c Chemical precipitation, coagulation, flocculation 20 Sedimentation 5 Filtration 10 Reverse osmosis, electrodialysis, etc. 20 Activated carbon 10 On-site treatment of system sludge 15 Ozonation 8 Fluoridation ........................................... 5 Disinfection ........................................... 5 - 8 b Laboratory Control by Plant Personnel Bacteriological (complexity) 3 - 10 b Chemical/physical (complexity) 1 - 10 b a Limit 10 points each, or maximum of 20 points for size. b Range of points determined by complexity of unit process operation, effluent discharge scheme, and complexity of onsite laboratory analysis. c Includes potassium permanganate greensand.
(d) To classify wastewater treatment systems under (a) of this section, the department will use the following point system:
Item Points Size a Maximum population served, peak day 1 point per 10,000 or part Design flow (average day) or peak month's production (average day), whichever is larger 1 point per 1.0 million gallons per day or part Pretreatment Screening, comminution 1 - 3 b Mechanically cleaned grit chamber 3 Plant pumping of main flow 3 Pre-aeration 1 Flow equalization 2 Primary Treatment Primary clarifiers 5 Combined sedimentation/digestion 5 Chemical addition 4 Dissolved air flotation 5 Secondary Treatment Trickling filter 10 Activated sludge 10 - 15 b Stabilization ponds without aeration 5 Aerated lagoon 8 Rotating biological surface 10 Activated bio-filter with aeration 15 Activated bio-filter without aeration 10 Pure oxygen 20 Secondary clarifiers 5 Advanced Waste Treatment Polishing pond 2 Chemical/physical without secondary 15 Chemical/physical following secondary 10 Ion exchange 10 Reverse osmosis, electrodialysis 5 Chemical recovery, carbon regeneration 4 Adsorption 10 Filtration 10 Solids Handling Thickening 5 Anaerobic digestion 10 Aerobic digestion 6 Evaporative sludge drying 2 Mechanical dewatering 8 Solids reduction (incineration, wet oxidation) 12 Residual disposal 1 - 4 b Disinfection ........................................... 5 - 8 b Chemical or mechanical dechlorination 3 Effluent Discharge Receiving stream 2 - 6 b Land application 2 Subsurface disposal 4 Laboratory Control by Plant Personnel Bacteriological (complexity) 3 - 10 b Chemical/physical (complexity) 1 - 10 b a Limit 10 points each, or maximum of 20 points for size. b Range of points determined by complexity of unit process operation, effluent discharge scheme, and complexity of on-site laboratory analysis.
(e) To classify water distribution systems under (a) of this section, the department will use the following point system:
Item Points Size a Maximum population served, peak day 1 point per 10,000 or part Finished water storage tank(s) 4 Circulating loops 1 loop 10 2 - 4 loops 15 5 - 10 loops 20 Fire hydrants 4 Standby generators 6 Miles of water line 0 - 2 2 2 - 10 4 10 - 100 6 Over 100 10 In-line disinfection 10 Gas chlorination 5 Hypochlorite chlorination 5 Iodine 5 Ultraviolet light 5 Valves Remote sensory 10 Automatic 8 Manual 4 Heat exchangers 10 Percentage of customers with meters 1 - 25% 4 25 - 50% 6 50 - 75% 8 75 - 100% 10 Pressure zones 2 - 3 10 More than 3 15 Utilidor (walk through) 10 a Limit 10 points each.
(f) To classify wastewater collection systems under (a) of this section, the department will use the following point system:
Item Points Size a Maximum population served, peak day 1 point per 10,000 or part Miles of sewer line 0 - 2 2 2 - 10 6 10 - 100 15 100 and over 25 Utilidor (walk through) 16 Standby generators at lift stations 6 Lift station types (Choose one most used in system) Wet well with pump above well 10 Wet well with submersible pumps 14 Wet well/dry well 16 Pneumatic ejectors 16 Number of lift stations 0 - 5 3 5 - 15 5 15 - 35 8 35 and over 10 a Limit 10 points each.
History: Eff. 8/21/78, Register 67; am 8/24/85, Register 95; am 1/18/2001, Register 157
Authority: AS 46.30.010
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Last modified 7/05/2006