Owners of property subject to this subchapter and required to install structural stormwater control measures shall implement those measures in compliance with each of the following standards:
(A) The measures shall control and treat runoff from the first one and one-half inches of rain. Runoff volume drawdown time for wet detention ponds shall be a minimum of 48 hours, but not more than 120 hours.
(B) All structural stormwater treatment systems used shall be designed to have a minimum of 90% average annual removal for Total Suspended Solids (TSS).
(C) General engineering design criteria for all projects shall be in accordance with 15A NCAC 2H .1008(c), as explained in the design manual.
(D) The measure shall discharge the storage volume at a rate equal or less than the pre-development discharge rate for the one-year, 24-hour storm, or as specified in the design manual.
(E) The approval of the stormwater permit shall require enforceable restrictions on property usage that runs with the land, including recorded deed restrictions and protective covenants, to ensure that future development and redevelopment maintains the site consistent with the approved project plans.
(Ord. 1538, passed 5-24-07)