(A) Stormwater designs shall meet the multi-stage storm frequency storage requirements as identified in the city’s LDRs.
(B) If hydrologic or topographic conditions warrant greater control than that provided by the minimum control requirements, the city’s Stormwater Management Division (SWMD) may impose any and all additional requirements deemed necessary to control the volume, timing, and rate of runoff.
(C) A 25-foot undisturbed no-build buffer zone is required to be left from top of bank on both sides for the entire length of streams that the City of Easley SWMD determines to be a perennial or intermittent stream. This is required for areas of new development and redevelopment. BUFFER means a vegetated area, including trees and shrubs which exists or is established to protect a stream system, lake or reservoir area. This buffer also applies to other sensitive areas such as springs, wetlands, and sinkholes.
(D) Stream destruction or relocation is prohibited.
(E) Sediment and erosion control measures shall be designed to control the rainfall and runoff from a two-year, 24-hour storm, as a minimum.
(F) Stabilization measures must be performed as soon as practicable in portions of the site where construction activities have temporarily or permanently ceased, but in no case more than 14 days after work has ceased. Where construction activity on a portion of the site is temporarily ceased, and earth-disturbing activities will be resumed within 14 days, temporary stabilization measures do not have to be initiated on that portion of the site.
(G) Litter, construction debris, oils, fuels, sanitary waste, and building products with significant potential for impact (such as stockpiles of freshly treated lumber) and construction chemicals that could be exposed to stormwater must be prevented from becoming a pollutant source in stormwater discharges by use of proper site design controls.
(H) For common drainage locations that serve an area with ten or more acres disturbed at one time, a temporary (or permanent) sediment basin that provides storage for a calculated volume of runoff from the drainage are from at least a ten-year, 24-hour storm, or equivalent control measures, must be provided where attainable until final stabilization of the site. Where no such calculation has been performed, a temporary (or permanent) sediment basin providing at least 3,600 cubic feet of storage per acre drained, or equivalent control measure, must be provided where attainable until final stabilization of the site. (Refer to NPDES General Permit for Storm Water Discharges From Large and Small Construction Activities, SCR100000 for more information pertaining to this item.)
(Ord. 2008-06, passed 4-14-08) Penalty, see § 52.999