(A) On areas that undergo new development or redevelopment, site construction resulting in disturbance of one acre or more total land area, post-construction control measures in the form of structural and/or non-structural best management practices are required. Specifically, post-construction stormwater pollutant loading should not exceed pre-construction pollutant loading. Pre-construction refers to the site immediately before the planned land disturbance and development activities occur. Pre-construction is not intended to be interpreted as that period before any human-induced land disturbance activity has occurred. Post-construction pollutant loadings will be controlled through the six minimum control measures under the county's stormwater NPDES permit. Post-construction stormwater best management practices (BMPs) shall follow Indiana's Stormwater Quality Manual as a guidance document. The county shall have full technical and administrative approval authority on the application and design of all post-construction BMPs, conditions, definitions, and submittal requirements of construction plans and specifications and other related documents. The minimum measures are implemented to meet the terms defined in 327 IAC 15-5-6.5(a)(8) which are enumerated below.
(B) The post-construction stormwater pollution prevention plan (SWP3). The SWP3 must include the following information:
(1) A description of potential pollutant sources from the proposed land use that may reasonably be expected to add a significant amount of pollutants to stormwater discharges.
(2) Location, dimensions, detailed specifications, and construction details of all post-construction stormwater quality measures.
(3) A description of measures 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 strip 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 measure will be installed.
(5) Stormwater quality measures that will remove or minimize pollutants from stormwater run-off.
(6) Stormwater quality measures that will be implemented to prevent or minimize adverse impacts to stream and riparian habitat.
(7) Stormwater quality measures that will be implemented to prevent or minimize adverse impacts to stream or riparian habitat.
(8) A narrative description of the maintenance guidelines for all post-construction stormwater quality measures to facilitate their proper long term function. This narrative BMP description shall be made available to future parties who will assume responsibility for the operation and maintenance of the post-construction stormwater quality measures.
(BC Ord. 2006-14, passed 7-26-06) Penalty, see § 54.99