(A) It is recognized that the developed areas, as compared to underdeveloped areas, generally have increased imperviousness, decreased infiltration rates, increased runoff rated, and increased concentration of pollutants such as fertilizers, herbicides, greases, oil, salts and other pollutants. As new development and re-development continues in the town, measures must be taken to intercept and filter pollutants from stormwater runoff prior to reaching legal drains, streams, rivers, Through the use of best management practices (BMPs) stormwater runoff will be filtered and harmful amounts of sediment, nutrients, and contaminants will be removed. The town has adopted a policy that the control of stormwater quality will be based on management of total suspended solids (TSS).
(B) (1) The project site owner must submit to the town MS4 operator, a stormwater pollution prevention plan (SWPPP). The SWPPP must include the following information:
(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.
(b) Location, dimensions, detailed specifications, and construction details of all post construction stormwater quality measures BMPs.
(c) Description of measures that will be installed to control pollutants in stormwater discharge that will occur after construction activities have been completed. Such practices include infiltration of runoff, 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 storm water retention and detention ponds.
(d) Sequence describing when each post construction stormwater quality measures will be installed.
(e) Stormwater quality measures that will remove or minimize pollutants from storm water runoff.
(f) Storm water quality measures that will be implemented to prevent or minimize adverse impacts to stream and riparian habitat.
(g) A narrative description of the maintenance guidelines for all post construction stormwater quality measures to facilitate their proper long-term function. The 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.
(2) BMPs shall be listed in EPA's National Menu for BMP Practice for Post-Construction Stormwater Management or the Indiana Stormwater Quality Manual (formerly Indiana Handbook for Erosion Control). The noted BMPs must be designed, constructed, and maintained according to guidelines provided in the above-referenced Menu or Manual or as provided by the manufacture of the stormwater BMP. Practices other than those specified in the pre-approved list may be utilized. However, the burden of proof, as to whether the performance (minimum 80% TSS removal) and ease of maintenance of such practices will be placed with the applicant. Details regarding the procedure and criteria for construction of acceptance of such BMPs are available from the International Stormwater Best Management Practices (BMP) Database developed by the Federal Highway Administration (FHWA) and the American Society of Civil Engineers (ASCE). The information and data is available at http://www.bmpdatabase.org
(C) New retail gasoline or diesel fuel outlets, new municipal, state, federal, or institutional gasoline or diesel refueling areas, or existing gasoline or diesel outlets and refueling areas that replace their existing tanks or install additional new tanks must install appropriate practices to reduce lead, copper, zinc, and hydrocarbons in stormwater runoff. The treatment system installed must be capable of removing 80% of floatable, sediments, and oils from the on-site storm water system before discharging to a town storm sewer, Madison County legal drain, or other natural or artificial drainage way. In addition, individual properties that have five acres or more of paved (asphalt, concrete, brick, stone pavers, or other impervious materials) area must install appropriate practices to reduce lead, copper, zinc, and hydrocarbons in stormwater runoff. The treatment system installed must be capable of removing 80% of floatable, sediments, and oils from the on-site water system before discharge to a town storm sewer, Madison County legal drain, or other natural or artificial drainage way.
(Ord. 2006-05, passed 6-1-06)