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Article 6: Development Standar" <br /> Section 6.14: Stormwater Management <br /> for the 1 year, 74_hour storm � <br /> (4)(3) Stormwater systems shall be designed to control and treat, at a minimum, the <br /> stormwater runoff generated by one inch of rainfall from all project area surfaces. <br /> The treatment volume shall be drawn down pursuant to standards specific to <br /> each practice as determined by the current version of the NC BWQ DEQ <br /> sStormwater_dDesign mManual.$ <br /> New development that would exceed the nutrient loading rates set out in <br /> subseGtio (°`(" abaveherein, shall include engineered stormwater controls <br /> designed to have a ' of 852% aveFage aRRual rerneyal for Total <br /> Primary and/or Secondary Stormwater Control Measure <br /> (SCM) per NCDEQ requirements. <br /> W(5) JPrWosed new development may satisffythe review criteria standards of this - Formatte <br /> section by meeting the post-development hydrologic criteria set out in in the most <br /> recent version of the North Carolina Low Impact Development Guidebook. <br /> (B) Additional Standards- Falls Lake Watershed Formatte <br /> (1) In addition to the standards contained in Section 6.14.6 (A)of the LIDO, <br /> development shall observe a no net increase in peak flow leaving the site from <br /> predevelopment conditions for the 1 year, 24 hour, storm.qu <br /> (C) Additional Standards-Jordan Lake Watershed <br /> (1) In addition to the standards contained in Section 6.14.6 (A)of the LIDO, <br /> development shall abide by.15 A NCAC 02H.1002 (44). , Formade <br /> 6.14.7 Nutrient Load Formatte <br /> (A) Nitrogen and phosphorus loads contributed by proposed new development shall not <br /> exceed the following unit-area mass loading rates: <br /> (1) Falls Lake Watershed <br /> (a) Nitrogen, 2.2 pounds per acre per year <br /> (b) Phosphorus, 0.33 pounds per acre per year <br /> () jorr1�_aF�.rn Lake Watershed12 <br /> (a) Upper�'e Creek Arm <br /> 2 pounds per aGFe per year <br /> rt,r�Phesph,rus ..2 pounds per-acre per year <br /> Given recent changes in State law,this provision is only applicable in the Falls Lake Watershed. Existing language <br /> is being moved to ensure consistency with applicable State standards. <br /> 8 For consistency purposes,staff is capitalizing references to the State's stormwater manual within the UDC. <br /> 9 Change in language to reflect regulatory changes as codified in NC Administrative Code(NCAC) 15A NCAC 02H <br /> .1002(37)and 15A NCAC 02H .1002(46). <br /> 10 This language is currently contained in Section 6.14.6(A)(3)of the UDO. As a result of recent changes in State <br /> law it now only has applicability for parcels located within the Falls Lake Watershed. The proposed amendment is <br /> intended to address this change. <br /> 11 This is commonly referred to as the'10%Rule'which allows for a 10%of less increase in peak stormwater runoff <br /> between pre and post development conditions for a parcel. Staff is recommending a specific reference to the <br /> applicable portion of the NCAC as part of this revision. <br /> 12 As previously indicated in order to ensure consistency with State standards,staff is recommending the <br /> elimination of existing regulations designed to address water quality/nutrient reduction within the Jordan Lake <br /> Watershed. Staff can only address these issues within the Falls Lake Watershed based on current State law. <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-98 <br />