15A NCAC 18A .0708       DEPURATION TREATMENT PROCESS WATER ‑ STANDARDS

(a)  Water Source.  Depuration process water shall not exceed fourteen fecal coliform Most Probable Number (MPN) per 100 milliliters of water prior to treatment.

(b)  Bacteriological.  All water to be used in shellfish depuration tanks shall be subjected to ultraviolet light treatment.  The tank water bacterial quality shall not exceed one total coliform Most Probable Number (MPN) per 100 milliliters of water.

(c)  Dissolved oxygen.  The amount of dissolved oxygen in the water in the depuration tanks shall be at least five milligrams per liter and shall be measured daily.

(d)  Temperature.  Depuration tank temperature shall be measured daily during the depuration process.  Temperatures of sea water used in the depuration process shall not be below 50°F (10°C) nor above 77°F (25°C).

(e)  Turbidity.  Turbidity in the depuration water shall not exceed 20 Jackson Turbidity Units or other equivalent methods and shall be measured daily.

(f)  Salinity.  Salinity of the depuration water shall deviate no more than plus or minus 20 percent of the value of the harvest area and shall be measured daily.

(g)  pH.  pH of the depuration water shall range from 7.0 to 8.4 and shall be measured daily.

(h)  Metallic ions and compounds.  Levels of metallic ions and compounds shall not exceed levels found in approved shellfish harvesting areas and shall be measured if required by the Division.

(i)  Pesticides, detergents, and radionuclides.  Levels of pesticides, detergents, and radionuclides shall not exceed levels found in approved harvesting areas and shall be measured if required by the Division.

(j)  Marine toxins.  Levels of marine toxins in the incoming sea water and in the source water shall not exceed levels found in approved shellfish harvesting areas and shall be measured if required by the Division.

 

History Note:        Authority G.S. 130A‑230;

Eff. February 1, 1987.