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Total Impervious Surface Calculation <br /> Surface Total Impervious FT2 <br /> Existing Cabin -28x50 30x52 1,560 <br /> Deck 10x53; 5x38;2x10 740 <br /> New Cabin Addition - 14x32 15x34 510 <br /> Sidewalk 2x20 40 <br /> Garage 1 -24x24 26x28 728 <br /> Garage 2 -24x36 33x38 1,254 <br /> Rock Driveway w/i 300' OHWM 12x168 2,016 <br /> Total Impervious Surface 6,848 <br /> Estimate average lot width out to 300' from OHWM = 115' <br /> Therefore, 115 x 300 = 34,500 ft2 <br /> 'Total Impervious Surface Percentage = (6,848/34,500) x 100 = 19.8% <br /> (Existing, without cabin addition = 6,338/34,500 x 100= 18.4%) <br /> SEE REVISION <br />