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3 <br />Amendments to the Orange County <br />Stormwater Ordinance <br />April 2006 <br />NOTE: The underlined text will be added to the Ordinance and the struck - through text <br />will be deleted. The attached Stormwater Ordinance amendments conform to <br />requirements by the North Carolina Department of Environment and Natural Resources <br />made effective as of March 1, 2006 for counties within the Neuse and Tar - Pamlico River <br />Basins. <br />Section 6 Nutrient Load Calculations <br />For the purpose of this Ordinance new development shall be defined by as to include the <br />following: <br />Any activity that disturbs greater than one acre of land in order to <br />establish, expand or modify a single family or duplex residential <br />development or a recreational facility. <br />Any activity that disturbs greater than one -half an acre of land in order to <br />establish, expand, or modify a multifamily residential development or a <br />commercial, industrial or institutional facility. <br />New development shall not include agriculture, mining, or forestry activities. Land <br />disturbing activity is defined as grubbing, stump removal, and/or grading. <br />A. The nitrogen export from each new development must be calculated. This <br />export will be calculated in pounds per acre per year (lbs /ac /yr). The two <br />methodologies that are to be used are as follows. <br />1. Method 1 <br />This method is intended for use where lots are shown but the actual <br />footprint of buildings are not shown on site plans. This method does not <br />require calculation of the area of building footprints. Rather, the <br />impervious surface resulting from building footprints is estimated based <br />on typical impervious areas associated with a given lot size. This method <br />is shown in Appendix 1. <br />2. Method 2 <br />This method is for residential, commercial, and industrial development <br />when the entire footprint of the roads, parking lots, buildings, and any <br />other built -upon area is shown on the site plans. This method is simpler <br />and more accurate since it does not require estimating the impervious <br />surface based on lot size. Method 2 is shown in Appendix 2. <br />a) If a non - residential subdivision plan is submitted without <br />impervious surfaces not shown, the following two options are <br />