(A) A stormwater quality management permit may only be issued after the review and acceptance of a post-construction SWPPP. The post-construction SWPPP is part of the Stormwater Quality Management Plan (SWQMP) and must include, but not be limited to, the following information:
(1) A description of potential pollutant sources from the proposed land use that may reasonably be expected to add an amount of pollutants to stormwater discharges;
(2) Location, dimensions, detailed specifications, and construction details of all post-construction stormwater quality best management practices (BMPs);
(3) A description of BMPs that will be installed to control pollutants in stormwater discharges that will occur after construction activities have been completed. Such practices include: infiltration of run-off; flow reduction by use of open vegetated swales and natural depressions; buffer strips and riparian zone preservation; filter strip creation; minimization of land disturbance and surface imperviousness; maximization of open space; and stormwater retention and detention ponds;
(4) A sequence describing when each post-construction stormwater quality BMP will be installed;
(5) Stormwater quality BMPs that will remove or minimize pollutants from stormwater runoff;
(6) Stormwater BMPs that will be implemented to prevent or minimize adverse impact to stream and riparian habitat; and
(7) A narrative description of the maintenance guidelines for all post-construction stormwater quality measures to facilitate their proper long-term function. This narrative description shall be made available to future parties who will assume responsibility for the operation and maintenance of the post-construction stormwater quality measures.
(B) The SWPPP shall include provisions for buffers.
(1) The no-disturbance buffer will be used to define areas where land disturbance activities shall not be permitted. Grading, clearing, and grubbing shall not be permitted in this area, but pruning, trimming, and partial removal of standing vegetation is permitted.
(a) The no-disturbance waterway buffer shall be defined as 25 feet from the top of the waterway bank as defined by geomorphic shape (not by the current water surface elevation).
(b) The no-disturbance waterway buffer shall be applied to all waterways and drainage systems that drain more than 25 acres of contributing area or are represented on a United States geological survey map as a blue line stream.
(2) The waterway buffer will be used to define areas where land disturbance activities shall be permitted, but construction of any building or structure shall not be permitted.
(a) A waterway buffer shall be applied to all waterways serving more than 25 acres of tributary area, or those represented on a United States geological survey map as a blue line stream.
(b) Automatic exemptions may be applied for the following (provided erosion prevention and sediment control, water quality, and cut-fill policies are adequately addressed):
1. Roads and utilities crossing waterways; and
2. Pedestrian trails and walkways proximate to waterways.
(c) The waterway buffer shall be define as the area contained within a boundary established 25 feet beyond the flood plain boundary, as defined by FEMA, or 50 feet from top of waterway bank, as defined by geomorphic shape (not by the current water surface elevation), whichever is larger.
(d) At a minimum, the waterway buffer shall be at least the width of the no-disturbance buffer, if applicable.
(e) The waterway buffer and flood plain may be used for application of water quality devices. This may only be permitted provided erosion prevention and sediment control, water quality, and cut-fill policies are adequately addressed, as determined by the county, according to the provisions of this chapter.
(Ord. 2019-25, passed 10-15-2019)