15A NCAC 02T .0605      DESIGN CRITERIA

(a)  The requirements in this Rule shall apply to new and expanding facilities.

(b)  Minimum degree of treatment for new and expanding systems shall meet a monthly average of each of the following:

(1)           five-day biochemical oxygen demand (BOD₅) ≤ 30 mg/L;

(2)           total suspended solids (TSS) ≤ 30 mg/L;

(3)           ammonia (NH₃-N) ≤ 15 mg/L; and

(4)           fecal coliforms ≤ 200 colonies/100 mL.

(c)  Waste, including treated waste, shall not be placed directly into, or in contact with, GA classified groundwater unless such placement will not result in a contravention of GA groundwater standards, as demonstrated by predictive calculations or modeling.

(d)  Excavation into bedrock shall be lined with a 10 millimeter synthetic liner.

(e)  Earthen treatment and storage facilities shall be prohibited.

(f)  By-pass and overflow lines shall be prohibited.

(g)  A water-tight seal on all treatment and storage units or two feet of protection from the 100-year flood elevation shall be provided.

(h)  Preparation of an operational management plan and, if appropriate, a crop management plan shall be provided.

(i)  Fencing shall be provided to prevent access to the irrigation site and treatment units shall be lockable.

(j)  Irrigation system design shall not exceed the recommended precipitation rates in the soils report prepared pursuant to Rule .0604 of this Section.

(k)  Septic tanks shall adhere to 15A NCAC 18A .1900.

(l)  Tablet chlorination or ultraviolet disinfection shall be provided.

(m)  Five days of storage based on average daily flow between the pump off float and inlet invert pipe shall be provided.

(n)  Pump and dosing tanks shall have audible and visual alarms external to any structure.

(o)  A rain or moisture sensor shall be provided to prevent irrigation during precipitation events or wet conditions that would cause runoff.

(p)  18 inches of vertical separation between the apparent seasonal high water table and the ground surface shall be provided.

(q)  One foot of vertical separation between any perched seasonal high water table and the ground surface shall be provided.

(r)  Loading rates shall not exceed 50 inches per year.

History Note:        Authority G.S. 143‑215.1; 143‑215.3(a);

Eff. September 1, 2006;

Readopted Eff. September 1, 2018.