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Article 4: Overlay Zoning Districts Section 4.2: Watershed Protection Orange County, North Carolina – Unified Development Ordinance Page 4-9 TABLE 4.2.6: IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (NON-RESIDENTIAL) L-ENO-PW 70% impervious surface, with structural BMPs required when impervious surface exceeds: 24% (w/ curb and gutter); or 36% (w/o curb and gutter). [1], [2] HAW-PW JORDAN-PW 24% impervious surface limit. [1], [2] [1] Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO. [2] For non-residential developments a stormwater feature/best management practice (BMP) shall be required in accordance with applicable local and State standards based on proposed land disturbance and/or a project exceeding impervious surface thresholds as identified herein. NOTE: Non-residential use impervious acreage limits in watershed with such limits are calculated using the actual amount of impervious surface for non-residential uses throughout the watershed, not by the overall number of acres of non-residential parcels located in a particular watershed. (A) Hillsborough Economic Development District (1) The Hillsborough Economic Development District is located within the Lower Eno - Unprotected watershed. Within the Hillsborough Economic Development District, as designated in the Land Use Element of the Comprehensive Plan, the maximum impervious surface ratio is 50% with detention ponds. 4.2.7 Placement of Streets, Driveways, and Buildings (A) Streets, driveways, and buildings or other structures shall be located, to the extent reasonably possible, so as to take full advantage of the absorptive capacity of the soils on which they are to be situated and to avoid the following environmentally sensitive areas: (1) Stream buffer zones as required by Section 6.13; (2) Wetlands as defined by the U.S. Army Corps of Engineers; (3) Land with slopes greater than 15%; and (4) Natural areas as identified in the Inventory of Natural Areas and Wildlife Habitats of Orange County, NC. (B) To avoid creating lots that will be difficult to build upon in compliance with the standards of this Section, the preliminary plan shall show proposed building envelopes and approximate driveway locations for all lots within subdivisions. (1) A zoning compliance permit shall not be issued for the construction of buildings or driveways outside the areas so designated on the preliminary plan unless the Planning Director makes a written finding that the proposed location complies with the provisions of this Section and Sections 6.13 (Stream Buffers) and 6.14 (Stormwater Management). 4.2.8 Modifications of the Impervious Surface Ratio Modifications of the Impervious Surface Ratios may be requested through one of the following provisions: (A) Through variance procedures of the Board of Adjustment, as described in Section 2.10. (B) Through approval and recordation of a conservation agreement, as provided in Article 4 of Chapter 121 of the N.C. General Statutes, between Orange County and a land owner that prohibits development of land in a protected watershed in perpetuity, subject to the following: 12