(A) It is recognized that developed areas, as compared to undeveloped areas, generally have increased imperviousness, decreased infiltration rates, increased runoff rates, increased potential for stream bank erosion downstream, and increased concentrations of pollutants such as fertilizers, herbicides, greases, oil, salts, and other pollutants. As new development and redevelopment continues in the county, measures must be taken to intercept and filter pollutants from stormwater runoff prior to reaching regional creeks, streams, and rivers. Through the use of best management practices (BMP), stormwater runoff will be filtered, and harmful amounts of sediment, nutrients, and contaminants will be removed. The county has adopted a policy that the control of stormwater quality will be based on the management of total suspended solids (TSS).
(B) The project site owner must submit to the county a stormwater pollution prevention plan (SWPPP) that would show placement of appropriate BMP(s) from a pre-approved list of BMPs specified in the Hendricks County Stormwater Technical Standards Manual. The noted BMPs must be designed, constructed, and maintained according to guidelines provided, or referenced, in the Hendricks County Stormwater Technical Standards Manual. Practices other than those specified in the pre-approved list may be utilized. However, the burden of proof as to whether the performance and ease of maintenance of such practices will be according to guidelines provided in the Hendricks County Stormwater Technical Standards Manual would be placed with the applicant. Details regarding the procedures and criteria for consideration of acceptance of such BMPs are provided in the Hendricks County Stormwater Technical Standards Manual.
(C) Requirements of this chapter and the Hendricks County Stormwater Technical Standards Manual with regard to post-construction stormwater quality management can be satisfied through a variety of methods broadly categorized under two general approaches:
(1) Conventional approach; or
(2) Low impact development (LID) approach.
(D) The site developer and designer are encouraged to review the LID discussion in the Hendricks County Stormwater Technical Standards Manual prior to site design.
(E) Gasoline outlets and refueling areas must install appropriate practices to reduce lead, copper, zinc, and hydrocarbons in stormwater runoff.
(F) These requirements will apply to all new facilities and existing facilities that replace their tanks.
(Ord. 2017-03, passed 1-24-2017)