Agenda - 09-16-2008 - 6c - Laserfiche WebLink

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~~ CONDITION TWELVE - STORIVIWATER (Formerly listed under Section 2-3-1 (8) of Staff recommended conditions -June 3, 2008 BOCC abstract -Attachment 3A) i2. In addition to any and all applicable local or State requirements, the following specific standards shall govern stormwater issues for this project: a. The project shall comply with the requirements for the EPA -Construction General Permit (CGP) and the Phase I and II of the national Pollutant Discharge Elimination System (NPDES) program, b. Riparian areas (stream buffers) shall be maintained in compliance with the Orange County 5tormwater Ordinance for Lands within the Meuse River Basin (Meuse Rules) adopted March 9, 2001, and as amended October 23, 2007 and in accordance with all applicable Orange County regulations, c. Impacts to the Meuse stream buffers on site shall comply with the uses listed in the Meuse Rules and the Orange County Zoning Ordinance. Examples of listed uses include utilities, roadways, etc. If Meuse stream buffer mitigation is required as a result this development, preference should be given to on-site mitigation such as stream buffer enhancement and/or restoration. d. The project shall comply with the stormwater requirements listed in the Meuse Rules. This includes: i. No net increase in peak flow leaving the site from the predevelopment conditions for the 1- year, 24-hour storm; predevelopment conditions are those currently existing as of April 9, 2008, and ii. Nitrogen load contribution leaving the site must be held to 3.61bs per acre per year. e. A Master Stormwater Management Plan (SMP) shall be developed to address stormwater runoff for the entire development even though individual parcels may be responsible for installing stormwater best management practices (BMPs). f. Innovative stormwater BMPs and practices shall be utilized that meet or exceed the requirements of the current version of the North Carolina Division of Water Quality Stormwater Best Management Practices Manual (July 2007). g. The project shall utilize on-site stormwater best management practices (BMPs) to meet these requirements to the extent practical. Using offset payments only in lieu of stormwater BMP's will not be accepted. h. The project shall install stormwater BMP's to remove enough nitrogen to bring the development down to 3.6 lbs/ac/yr export OR do a combination of BMP's and offset payment to achieve a 3.6 lbs/ac/year export. A combination of stormwater BMP's and offset payment will be allowed under the following conditions: i. Onsite stormwater BMPs are designed so that the computed nitrogen loading is below 7.0 lbs/ac/year that is more restrictive that the Meuse Rules currently require. ii. The offset fee to bring the remaining loading rate to the 3.6 lbs/ac/year is used in Orange County. i. The developer shall collaborate with County staff during the SMP design process. To encourage this, a minimum of three meetings with stormwater staff will be conducted prior to submittal of the. SMP.