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30 <br /> 2. Non-Residential Development <br /> DISTRICT IMPERVIOUS SURFACE/DETENTION POND <br /> REQUIREMENTS <br /> (NON-RESIDENTIAL) <br /> UNIV-CA Same as Residential (See previous Table) <br /> UNIV-PW <br /> CANE-CA Up to 6% impervious surface without BMPs, <br /> U-ENO-CA 6% - 24% with BMPs. <br /> CANE-PW Up to 70% impervious surface without BMPs'. <br /> LITHE-PW <br /> HYCO-PW <br /> BACK-PW <br /> FLAT-PW <br /> U-ENO-PW Up to 70% impervious surface, with BMPs <br /> required when impervious surface exceeds 12%.1 <br /> L-ENO-PW Up to SO. 70% impervious surface, with BMPs <br /> HAW-PW required when impervious surface exceeds 24% (if <br /> JORDAN-PW curb and gutter is used) or 36% (no curb and <br /> gutter). <br /> After new non-residential development with impervious surface greater than 12% occurs <br /> on 5% of the watershed, impervious surface for subsequent development may not exceed <br /> 30%, and BMPs will be required when impervious surface exceeds 12%. <br /> 2. Modifications of the Impervious Surface Ratio <br /> Modifications of the Impervious Surface Ratios my be requested through <br /> one of the following provisions: <br /> a) Through variance procedures of the Board of Adjustment, as <br /> described in Article 6.23.13. <br /> b) Through approval and recordation of a conservation agreement, as <br /> provided in Article 4 of Chapter 121 of the N.C. General Statutes, <br /> between Orange County and a land owner that prohibits <br /> development of land in a protected watershed in perpetuity. In <br /> such cases, a modification of the required impervious surface <br /> ratios may be approved administratively but only to the extent that <br /> 7 <br />