07/25/2007 Env Bd Packet - Laserfiche WebLink

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• • RULE C STORM -WATER MANAGEMENT PLANS 1. POLICY. It is the policy of the Board of Managers to manage stormwater and snowmelt runoff on a local, regional or subwatershed basis and promote natural infiltration of runoff throughout the District to: (a) Maximize infiltration on individual sites through Better Site Design practices and advanced stormwater management to control runoff volume increases. (b) Provide effective water quality treatment before discharge to surface waterbodies and wetlands, while considering the historic use of District water features. (c) Ensure that future peak rates of runoff are less than or equal to pre - settlement rates. (d) Minimize land use impacts and improve operational and maintenance efficiency by siting stormwater management basins, when needed, regionally unless local resources would be adversely affected. 2. REGULATION. A permit incorporating an approved stormwater management plan is required under this rule for new development, redevelopment, or additions to an existing site, consistent with the following: (a) A permit is required for industrial, commercial or multi-unit residential development or redevelopment only for a site at least one acre in size. (b) A permit is required for single - family residential development or redevelopment only for a site at least five acres in size. (c) Notwithstanding paragraph (b), a permit is not required for construction of a single - family detached dwelling on an isolated lot. (d) The site size thresholds of paragraphs (a) and (b) and the exception of paragraph (c) do not apply if the site is: (1) Within the 100 - yearfloodplain; (2) Within 1,000 feet of a public water or protected wetland; or (3) Within 300 feet of Rice Creek, Clearwater Creek, Hardwood Creek or a public ditch. (e) If redevelopment will (i) disturb fifty percent or more of existing impervious surface or (ii) increase impervious surface by fifty percent or more, the requirement of paragraph 3(b)(ii)(b) will apply to all impervious surface on the site. For the purpose of this paragraph, the extent of disturbance is the area of exposure of underlying soils. (f) A permit is not required for construction on an individual lot within a residential subdivision if it conforms to a development plan approved by the District. DRAFT DOCUMENT 9