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TABLE 3-7 <br /> EXISTING ANNUAL NONPOINT POLLUTION LOADINGS <br /> FOR LAKE MICHIE WATERSHED <br /> Durham Person Orange Granville <br /> County County County County Total <br /> Area (acres) 19,961 79,946 6,785 338 107,030 <br /> Percent Imperviousness 4.7% 2.0% 1.5% 0.5% 2.4% <br /> Average Annual Load <br /> o Total-P <br /> (tons) 3.4 15.5 1.3 < 0.1 20.2 <br /> (% of total) 16.7% 76.9% 6.2% 0.2% 100.0% <br /> o Total-N <br /> (tons) 37.6 179.4 15.4 0.6 233.0 <br /> (% of total) 16.2% 77.0% 6.6% 0.3% 100.0% • <br /> o Lead <br /> (tons) 0.3 0.8 0.1 < 0.1 1.2 <br /> (% of total) 26.3% 69.0% 4.7% < 0.1% 100.0% <br /> o Zinc <br /> (tons) 0.9 2.2 0.2 < 0.1 3.2 <br /> (% of total) 26.7% 68.0% 5.1% 0.2% 100.0% <br /> 3-27 <br />