15A NCAC 02T .0605 DESIGN CRITERIA
(a) The requirements in this Rule apply to new and expanding facilities.
(b) Minimum degree of treatment prior to storage shall meet a monthly average of five-day Biochemical Oxygen Demand (BOD5) ≤ 30 mg/L; Total Suspended Solids (TSS) ≤ 30 mg/L; Ammonia (NH3) ≤ 15 mg/L; and 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/storage units or minimum of two feet protection from 100-year flood 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 (minimum 2-strand wire) and treatment units shall be secured with locks on all tankage and control panels.
(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 disinfection shall be provided.
(m) A minimum of five days of storage based on average daily flow between the pump off float and inlet invert pipe shall be provided.
(n) Pump/dosing tanks shall have audible and visual alarms external to any structure.
(o) Rain / moisture sensor shall be provided to prevent irrigation during precipitation events or wet conditions that would cause runoff.
(p) A minimum of 18 inches of vertical separation between the apparent seasonal high water table and the ground surface shall be provided.
(q) A minimum of 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.