15A NCAC 18D .0203      RATING VALUES TO DETERMINE VARIOUS CLASSES OF CERTIFICATION

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

History Note:        Authority G.S. 90A‑21(c); 90A‑22;

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.