The C-SWPPP must include a Best Management Practices (BMP) section that accurately and descriptively addresses the use, installation, maintenance and inspection for each measure outlined in the Stormwater Management and Sediment Control section. This BMP section must be in accordance with SCDHEC’s General Permit for Stormwater Discharges for Construction Activities. In additions the plan must include the following:
(a) Development shall be fitted to the topography and soils so as to create the least erosion potential.
(b) Natural vegetation shall be retained and protected wherever possible.
(c) Natural vegetation and non-structural methods shall be employed to the extent possible, for streambank stabilization and erosion control in place of structural methods wherever possible.
(d) Only the smallest practical area shall be exposed and then only for the shortest practical period of time.
(e) Waterway stabilization structures such as drop structures, grade stabilization structures, and channel liners shall be utilized to dissipate the energy of flowing water by holding the waterway slopes and velocities within non-erosive limits.
(f) Sediment basins and traps.
(1) The structure may be removed once stabilization is reached in the development of the area draining to that sediment basin or trap.
(2) A sediment basin or sediment trap may be required to be enclosed, in the discretion of the Director, when necessary to ensure public safety.
(3) Sediment basins and traps shall be designed to achieve a sediment removal efficiency of 80% or greater for total suspended solids (TSS) or meet a 0.5 ml/l settleable solids effluent standard using a 10-year 24-hour design storm event, whichever is less.
(g) Cut and fill slopes and other exposed areas shall be stabilized as soon as practical to limit the duration of the exposed soil.
(h) All sediment control BMPs shall be designed and installed to meet a minimum sediment removal efficiency of 80% for total suspended solids (TSS) or greater or a 0.5 ml/l settleable solid effluent concentration using a 10-year, 24-hour design storm event, whichever is less.
(i) Description of spill prevention and response practices.
(j) Temporary erosion and sediment control measures shall be maintained continuously until permanent soil erosion control measures have reached final stabilization.
(Ord. 4281, passed 5-5-2009; Ord. 4698, passed 5-5-2015)