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in the total suspended solids load in drainage from the site that results from the <br />development to no more than 20 percent above that which would occur from <br />natural drainage from the site. See the City of San Marcos Stormwater Technical <br />Manual for design guidance in coordination with the TCEO BMP Guidance <br />Manual. <br />SECTION 10. Chapter 5, Environmental Regulations, Article 3, Development Related <br />to the San Marcos River Corridor, Section 5.3.2.2, Water Quality Standards, is amended to read <br />as follows: <br />5.3.2.2 Water Quality Standards <br />(a) Water Quality Zone. The water quality zone for the waterways <br />within the SMRC shall be defined in accordance with Div ien ' of this ^ ftiele 2 <br />Section 5.1.2.2 for a FEMA- mapped waterway, or as all land within a distance of <br />100 feet from a bank of the river, whichever is greater. <br />(b) Buffer Zone. The buffer zone of the waterways within the SMRC <br />shall be defined in accordance with Division 1 of this Article 3 for a FEMA- <br />mapped waterway, or as all land within a distance of 200 feet from a bank of the <br />river, whichever is greater. <br />(c) Impervious Cover Limitations. Impervious cover limitations within <br />the water quality zone of the SMRC shall be as provided in Section 5.1.2.4(a). <br />Impervious cover limitations in areas of the SMRC outside water quality zones <br />shall be as provided in Section 5.3.2.5 <br />(d) Other Land Within the Corridor. Any development within the <br />SMRC outside the water quality or buffer zones shall meet the requirements of <br />Section 5.3.2.5 regarding overland flow. <br />(e) Water Quality Basins. All Stormwater runoff from the developed <br />site shall be treated to a level equivalent to that provided by sedimentation - <br />filtration BMPs Water- quality dote tie E)r sedimentation basins shall be situ + a <br />and constructed to capture and hold at least the first one -half inch of runoff from <br />the contributing drainage area . All subsequent runoff in <br />excess of the design capacity of the basins shall bypass the basins and remain <br />segregated from the contained runoff waters in a peak shaving basin up to the <br />capacity specified in section 5.1.1.3 (b) the Austin Drainage 04tefia Manual. <br />(f) Design of Water Quality Basins. The design of all water quality <br />basins shall allow an minimum drawdown time of 24 <br />hours for the first one -half inch of runoff from the contributing drainage area eAl <br />The design of all water quality basins shall incorporate efficient <br />removal of contaminants, including but not limited to lead, zinc, iron, total <br />phosphorous, total nitrogen, total suspended solids, and fecal coliform bacteria <br />