Haw. Code R. § 11-61-6 - Classification of wastewater treatment plants

(a) Rating wastewater treatment plants.

(1) The board shall rate and classify all wastewater treatment plants. In making classifications, the board shall consider among other factors, the size and type of plants, characteristics of wastewater to be treated, and other physical conditions affecting such wastewater treatment plants, and the skill, knowledge and experience required of an operator.

(2) Individual wastewater systems, as defined in chapter 11-62 such as cesspool, septic tank, and household aerobic unit facilities, shall be exempt from classification. Industrial plants for treatment of process water from oil refineries and sugar mills shall be exempt from classification, provided such waste streams contain no domestic component and provided further that they do not discharge to a municipal collection, treatment, or disposal system. Application for exemption from classification of other industrial wastewater treatment plants may be made to the director.

(3) In classifying or exempting from classification wastewater treatment plants, the board shall consider applicable provisions of chapter 11-62 regarding wastewater treatment plants and chapter 11-23 pertaining to the control of underground injection of wastewater.

(4) The owner of the wastewater treatment plant shall notify the board within thirty days of any significant change in treatment process, waste characteristics, and waste flow.

(b) The criteria to be used for the rating of wastewater treatment plants are contained in Table I, Criteria for Classification of Wastewater Treatment Plants, dated July 1, 2001, located at the end of this section. The board shall classify segments of wastewater treatment plants as deemed necessary where the rating criteria of Table I is not applicable. For new or significant treatment unit processes or controls not adequately described in Table I, the board may include such processes or controls into the classification criteria and assign an appropriate number of points to the new processes or controls.

TABLE I

CRITERIA FOR CLASSIFICATION OF WASTEWATER TREATMENT PLANTS JULY 1, 2001

PLANT CLASS	I.	II.	III.	IV.
RANGE OF POINTS	30 or less	31-55	56-75	76 or greater

Assign points for every item that applies:

ITEM

Size
Maximum population equivalent (P.E.) served, peak day..........	1 pt. per 10,000 P.E. or part	Max. 10 Points
Design flow (avg. day) or peak month's flow (avg. Points day), whichever is larger.......	1 pt. per MGD or part	Max. 10

Effluent Discharge Receiving stream (sensitivity)...	(2-6 pts. range)
"Effluent limited segment" in Environmental Protection Agency (EPA) terminology; secondary treatment is adequate.................	1
More than secondary treatment is required...............................	2
"Water quality limited segment" EPA terminology; stream conditions are very critical (dry reach, for example) and a very high degree of treatment is required........	3
Effluent used in a direct recycle and reuse system...............	6
Land disposal............................	2
Subsurface disposal......................	5

Variation in Raw Wastes (slight to extreme)............	(0-6 pts. range)
Variations do not exceed those normally or typically expected..........	0
Recurring deviations or excessive variations of 100 to 200 percent in strength and/or flow....................................	2
Recurring deviations or excessive variations of more than 200 percent in strength and/ or flow.................................	4
Raw wastes subject to toxic waste discharges........................	6
Pretreatment
Screening, comminution....................	3
Grit removal..............................	3
Plant pumping of main flow................	3
Standby power supply......................	2
Flow Equalization..........................	2
Primary Treatment
Primary clarifiers........................	5
Combined sedimentation/ digestion...............................	5
Chemical addition (except chlorine, enzymes)......................	4
Secondary Treatment
Trickling filter w/sec. clarifiers..............................	10
Activated sludge w/sec. clarifiers (including ext. aeration and oxidation ditches.................................	15
Stabilization ponds without aeration................................	5
Aerated lagoon............................	8
Chemical Stabilization....................	5
Advanced Waste Treatment
Polishing pond............................	2
Chemical/physical - without secondary..................................	15
Chemical/physical - following secondary...............................	10
Biological or chemical/ biological..............................	12
Ion exchange..............................	10
Reverse osmosis, electrodialysis.........................	15
Chemical recovery, carbon regeneration............................	4
Additional Treatment Processes
Dissolved air flotation units.............	5
Chemical/physical odor control............	4
Influent/effluent pump stations...........	3
Wastewater pump stations..................	3
Solids Handling
Thickening................................	5
Anaerobic digestion.......................	10
Aerobic digestion.........................	6
Evaporative sludge drying.................	2
Mechanical dewatering.....................	8
Solids reduction (incineration, wet oxidation)..........................	12
Disinfection
Chlorination or comparable................	5
On-site generation of disinfectant........	5
Ultraviolet disinfection..................	10
Ozonation.................................	10

Laboratory Control by Plant Personnel Bacteriological (complexity)..	(0-10 pts. range)
Lab work done outside the plant...........	0
Membrane filter procedures................	3
Use of fermentation tubes or any dilution methods, fecal coliform determination..................	5
Biological identification.................	7
Virus studies or similarly complex work conducted on-site..........	10

Chemical/physical (complexity)..	(0-10 pts. range)
Lab work done outside the plant...................................	0
Pushbutton or visual methods for simple tests such as pH, settleable solids -- up to..............	3
Additional procedures such as DO, COD, BOD, gas analysis, titrations, solids volatile content - up to.........................	5
More advanced determinations such as specific constituents: nutrients, total oils, phenols, etc. - up to............................	7
Highly sophisticated instrumentation such as atomic absorption and gas chromatography.............	10

Notes

Haw. Code R. § 11-61-6

[Eff. 11/5/81; am and comp 1/22/2002] (Auth: HRS §§ 340B-2, 340B-7) (Imp: HRS §§ 340B-2, 340B-7)