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• 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 2. <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 3. <br /> a) If a non-residential subdivision plan is submitted without <br /> impervious surfaces not shown,the following two options are <br /> available: <br /> (1) Option A <br /> Property owner must specify the areas of impervious . <br /> surface,undisturbed open space and managed open space <br /> on the property in a restrictive covenant. Method 2 would <br /> then be applied. <br /> (2) Option B <br /> Planning staff will determine a worst-case scenario for the <br /> areas of impervious surface and managed open space for <br /> the type of development specified. Method 2 would then be <br /> applied. <br /> B. Nutrient Export Figures <br /> Calculations must be in accordance with either Method 1 or 2 shown in Appendix <br /> 1 and 2,respectively, of this Ordinance. <br /> 23 <br />