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Article 6: Development Standards 83 <br /> Section 6.14: Stormwater Management <br /> (b) Where on-site infiltration methods Infiltration Systems are utilized, areas <br /> for such purposes shall be designated on the plat and shall remain <br /> undisturbed both during and after construction. <br /> (c) Undisturbed areas designated149 for infiltration of run-offstormwater <br /> runoff shall also be located downslope from impervious surfaces and <br /> shall not include areas characterized by floodplains, highly erodible or <br /> impervious soils, steep slopes or previously disturbed areas. <br /> (d) Areas designated as suitable for septic tank nitrification fields may not be <br /> used for stormwater runoff infiltration purposes. <br /> (B) Stormwater Control Measures (SCMs) <br /> (1) 150In cases where Ron Str,,,.f„ral methods-non-structural mMethods may not <br /> adequately control the stormwater runoff from the first ;n^h f ram;^generated by <br /> the first inch of rain from all protect surfaces due to the amount of impervious <br /> surface proposed to be developed, or in cases where Non-Structural Methods <br /> are not effective or appropriate due to P4-other-factors such as Vie,slopes <br /> the presence of highly erodible soils, <br /> impervious soils, steep slopes, and/or lack of vegetative cover, permanent <br /> Stormwater Control Measures (SCMs)151 which capture stormwater runoff for <br /> slow release through an controlled outlet, are required. <br /> (2) Where required, SCMs shall be constructed in accordance with this Section. <br /> (C) Impervious Surface and Detention Po SCM152 Requirements <br /> (1) For all protected watersheds, an absolute limit on the percentage of lot area <br /> which can be covered with impervious surfaces has been established. See <br /> Section(s)4.2.5 and 4.2.6 of this Ordinance. <br /> (2) In some cases, SCMs are required when the proposed impervious surface ratio <br /> exceeds a specified percentage, which is below the absolute limit. <br /> 6.14.5 Applicability <br /> (A) The stormwater management standards and regulations included herein are applicable to <br /> all new development within the Orange County planning jurisdiction, including private, <br /> public, state, and federal development not covered by a separate NPDES permit, as <br /> follows: <br /> (1) Falls Lake Watershed <br /> (a) Any activity Land-Disturbing Actiyity153 that cumulatively disturbs greater <br /> than one-half acre of land in order to establish, expand or modify a single <br /> family or duplex residential development or a recreational facility. <br /> (b) Any' Land-Disturbing Activity that cumulatively disturbs greater <br /> than 12,000 square feet of land in order to establish, expand, or modify a <br /> multifamily residential development or a commercial, industrial or <br /> institutional facility. <br /> 141 Text correction-added "designated". <br /> 1so Section 6.14.4.E(1) re-formatted to improve reading clarity and fix grammar errors. <br /> 1s1"Stormwater Control Measures" is correctly noted to match the Definitions section of this Ordinance, includes <br /> the appropriate acronym for Stormwater Control Measures(SCMs)-NOTE: "Stormwater Control Measure"and <br /> "SCM"are integrated through the remainder of Section 6.14, where applicable. <br /> 1s2 Consistent use of SCM. <br /> 1s3"Land-Disturbing Activity"correctly noted to match the Ordinance definitions section-NOTE: "Land- <br /> Disturbing Activity"is integrated through the remainder of Section 6.14, where applicable. <br /> Orange County, North Carolina-Unified Development Ordinance Page 6-99 <br />