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5 <br /> 1. Residential Development <br /> DISTRICT IMPERVIOUS SURFACE/DETENTION POND <br /> REQUIREMENTS <br /> (RESIDENTIAL) <br /> UNIV-CA 6% impervious surface limit. <br /> UNIV-PW EXCEPT for all lots which existed prior to 4/2/90, <br /> which are subject to impervious surface limits as <br /> provided in the following Table (entitled Sliding Scale <br /> for Residential Impervious Surface Ratios). <br /> BMPs cannot be used to satisfy watershed <br /> requirements. <br /> CANE-CA 6% impervious surface limit. <br /> CANE-PW EXCEPT for lots smaller than two acres which existed <br /> U-ENO-CA prior to 1/1/94, which are subject to impervious <br /> surface limits as provided in the following Table <br /> (entitled Sliding Scale for Residential Impervious <br /> Surface Ratios). <br /> BMPs cannot be used to satisfy watershed <br /> requirements. <br /> LITTLE-PW 6% impervious surface limit. <br /> EXCEPT for lots which existed prior to 1/1/94, which <br /> are subject to impervious surface limits as provided in <br /> the following Table (entitled Sliding Scale for <br /> Residential Impervious Surface Ratios). <br /> BMPs cannot be used to satisfy watershed <br /> requirements. <br /> FLAT-PW 12% impervious surface limit for new and existing lots. <br /> HYCO-PW BMPs cannot be used to satisfy watershed <br /> BACK W requirements. <br /> U-ENO-PW 12% impervious surface limit for existing and new lots <br /> B K-PW outside of Transition Areas as designated in the Orange <br /> County Land Use Plan. BMPs cannot be used to <br /> satisfy watershed requirements. <br /> 30% impervious surface limit for developments which <br /> exceed a density 1 du/acre within Transition Areas as <br /> designated in the Orange County Land Use Plan. <br /> Structural BMPs are required if impervious surface <br /> exceeds 12%. <br /> 5 <br />