(A) All sites shall develop a storm water pollution prevention plan. The plan must include: a description of potential pollutant sources from the proposed land use, that may reasonably be expected to add a significant amount of pollutants to storm water discharge; location, dimensions, detailed specifications and construction details of all post- construction storm water quality measures; a description of measures that will be installed to control pollutants in storm water discharges that will occur after construction activities have been completed; a sequence describing when each post-construction storm water quality measure will be installed; and a narrative description of the maintenance guidelines for all post-construction storm water quality measures to facilitate their proper long-term function.
(B) All site designs shall establish storm water management practices to control the peak flow rates of storm water discharge associated with specified design storms and reduce the generation of storm water. These practices should seek to utilize swales and natural depressions as site conditions allow, utilize pervious areas for storm water treatment and to infiltrate storm water runoff generated from driveways, sidewalks, rooftops, parking lots and landscaped areas to the maximum extent practical to provide treatment for both water quality and quantity.
(C) All storm water runoff generated from new development shall not discharge untreated storm water directly into a jurisdictional wetland or local water body without adequate treatment. Where such discharges are proposed, the impact of the proposal on wetland functional values shall be assessed using a method acceptable to the city. In no case shall the impact on functional values be any less than allowed by the Army Corp of Engineers (ACE) or the state’s Department of Natural Resources (IDNR).
(D) All sites shall preserve buffer strips and riparian zones, create filter strips, minimize land disturbance, minimize surface imperviousness, minimize directly connected impervious areas, maximize open space, direct growth away from sensitive areas and toward areas that can support it without compromising water quality, have storage, have infiltration, in any combination, where appropriate to reduce the impact of pollutants in storm water run-off on receiving waters.
(E) Infiltration practices will not be allowed in wellhead protection areas.
(F) Discharges from an MS4 area will not be allowed directly into sinkholes or fractured bedrock without treatment that results in the discharge meeting state ground water quality standards as referenced in 327 I.A.C. 2-11.
(G) Any storm water practice that is a Class V injection well must ensure that the discharge from such practices meets state ground water quality standards as referenced in 327 I.A.C. 2-11.
(H) As site conditions allow, the rate at which water flows through the MS4 conveyances shall be regulated to reduce outfall scouring and stream bank erosion. Where necessary, channel protection shall be provided to protect stream channels from degradation.
(I) As site conditions allow, a vegetated filter strip of appropriate width shall be maintained along unvegetated swales and ditches.
(J) New retail gasoline outlets, new municipal, state, federal or institutional refueling areas or outlets and refueling areas that replace their existing tank systems shall be required to design and install appropriate practices to reduce lead, copper, zinc and polyaromatic hydrocarbons in storm water run-off.
(K) (1) Storm water discharges to critical areas with sensitive resources (i.e., wellhead protection areas, cold water fisheries, shellfish beds, swimming beaches, recreational waters, recharge areas, water supply reservoirs) may be subject to additional performance criteria, or may need to utilize or restrict certain storm water management practices.
(2) Certain industrial sites are required to prepare and implement a storm water pollution prevention plan in accordance with 327 I.A.C. 15-6, and shall file a notice of intent (NOI) under the provisions of the National Pollutant Discharge Elimination System (NPDES) general permit. The storm water pollution prevention plan requirement applies to both existing and new industrial sites.
(L) Storm water discharges from land uses or activities with higher potential pollutant loadings, known as “hotspots”, may require the use of specific structural storm water treatment practices and pollution prevention practices.
(M) All storm water management practices shall have a landscaping plan detailing both the vegetation to be in the practice and how and who will manage and maintain this vegetation.
(Prior Code, § 59.1.09) (Ord. 68-2005, passed - -2005)