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• <br /> 5. Summary of Drainage Areas and BMP's Treatment Devices <br /> Area A <br /> Drainage Area A, as shown on the BMP Exhibit incorporates approximately 23,706 square feet of <br /> impervious concrete pavement. <br /> Area B <br /> Drainage Area B, as shown on the BMP Exhibit incorporates approximately 17,942 -square feet of <br /> impervious roof area. <br /> TABLE - :1 Impervious Area <br /> Minimum Surface <br /> Impervious BMP to be used Si Required Areas as <br /> Area ID Surface Area zing BMP Area designed <br /> (ft (ft2) (ft2) (ft2) <br /> Area A Paving Area 23,706 Bio-retention 0.04 23,706 23,750 <br /> Area B Roof 17,942 Flogard Downspouts - 17,942 18,000 <br /> Totals 41,648 41,648 41,750 <br /> 5/1/2012 <br /> 6 <br />