15A N.C. Admin. Code 18D.0203
The designation of public water system treatment classifications shall be based on the following rating values:
PARAMETER | RATING VALUE |
(1) Surface Water Source | |
(a) flowing stream | 5 |
(b) flowing stream with impoundment | 7 |
(c) raw water treatment | 3 |
(2) Ground Water Source | |
(a) first five wells | 5 |
(b) add 1 point per 5 wells or fraction thereof over 5 | 1 |
(3) Coagulation | |
(a) aluminum sulfate, ferric chloride | 10 |
(b) polymer | 5 |
(4) Mixing | |
(a) baffle | 2 |
(b) mechanical | 4 |
(c) air | 3 |
(5) Oxidation (pre-treatment) | |
(a) C1202 | 5 |
(b) ozone | 5 |
(c) KMn04 | 3 |
(d) C12 | 3 |
(6) Carbon Treatment | 2 |
(7) Aeration | |
(a) mechanical draft | 3 |
(b) coke tray or splash tray | 2 |
(c) diffused | 3 |
(d) packed tower (VOC reduction) | 10 |
(8) pH Adjustment (primary) | |
(a) caustic (NaOH) | 10 |
(b) lime or soda ash | 3 |
(c) acid | 10 |
(9) Sedimentation | |
(a) standard rate | 5 |
(b) tube settlers | 3 |
(c) upflow | 8 |
(d) pulsators and plates | 5 |
(10) Contact Tank | 1 |
(11) Filtration | |
(a) pressure | |
(i) sand or anthracite | 8 |
(ii) synthetic media (birm) | 8 |
(iii) granular activated carbon (GAC) | 9 |
(b) gravity | |
(i) sand | 10 |
(ii) anthracite (mixed) or GAC | 12 |
(iii) with surface wash or air scour | 2 |
(c) membrane | 10 |
(12) Ion Exchange | |
(a) softener, Na cycle | 5 |
(b) softener, H cycle | 7 |
(c) Fe and Mn (greensand) | 9 |
(d) mixed bed or split stream | 9 |
(13) Lime Softening | |
(a) spiractors | 10 |
(b) clarifier with coagulation | 12 |
(c) fuel burner (recarbonation) | 5 |
(14) Phosphate (sequestering agent) | 5 |
(15) Stabilization | |
(a) acid feed | 10 |
(b) phosphate | 2 |
(c) caustic (NaOH) | 10 |
(d) lime or soda ash | 3 |
(e) contact units | 5 |
(16) Reverse Osmosis, Electrodialysis | 15 |
(17) Disinfection | |
(a) gas C12 | 10 |
(b) hypochlorite solution | 7 |
(c) C1202(sodium chlorite and C12) | 13 |
(d) ozone | 13 |
(e) ammonia and C12 | 12 |
(f) ultraviolet light (uv) | 5 |
(18) Fluoridation | |
(a) saturator | 8 |
(b) dry feed | 8 |
(c) solution (acid) | 10 |
(19) Pumping | |
(a) raw | 3 |
(b) intermediate | 1 |
(c) finished | 3 |
(d) system booster | 2 |
(20) Storage | |
(a) raw | 1 |
(b) treated ground level tank | 1 |
(c) elevated in system (each extra tank 1 point) | 2 |
(d) hydropneumatic | 2 |
(21) Population Served 1 point per 1,000 persons served | 50 max |
(22) Plant Capacity 1 point per 1 MGD capacity | 25 max |
(23) On-Site Quality Control | |
(a) bacteriological | |
(i) MPN/MF | 5 |
(ii) HPC | 2 |
(iii) MMO-MUG (Colilert) | 2 |
(b) pH | |
(i) meter | 2 |
(ii) test kit | 1 |
(c) fluoride | |
(i) meter | 3 |
(ii) colorimetric | 3 |
(d) chlorine | |
(i) titrator | 3 |
(ii) colorimeter/spec. | 2 |
(iii) test kit | 1 |
(e) iron | 1 |
(f) hardness | 1 |
(g) alkalinity | 1 |
(h) turbidity | 1 |
(i) manganese | 1 |
(j) others (1 point each) | 1 |
(k) A.A. Spec, or G.C. Unit | 5 each |
15A N.C. Admin. Code 18D .0203
Eff. February 1, 1976;
Readopted Eff. March 1, 1979;
Amended Eff. August 1, 2000; August 3, 1992; January 1, 1992; September 1, 1990;
Readopted Eff. September 1, 2018.
Eff. 2/1/1976;
Readopted Eff. 3/1/1979;
Amended Eff. 8/1/2000; August 3, 1992; January 1, 1992; September 1, 1990.