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• percent, and soils with high sand content and fast percolation rates tend to denitrify at a <br /> lower rate of about 10 percent. <br /> A denitrification factor of 35 percent was selected for the Site because of the clay and <br /> peat soils present at the proposed septic system location. <br /> Nitrate Loading Estimate <br /> Two nitrate loading scenarios were employed, to determine the impact to ground water <br /> from the anticipated typical occupancy and theoretical full occupancy. The scenarios <br /> utilize the variables discussed previously, which represent the estimated conditions and <br /> uses associated with this project. <br /> The following table presents a summary of the assumptions for the nitrate loading <br /> calculation for typical occupancy on the Site, as presented in Plate 11: <br /> Table 8. Assumptions for Nitrate Loading Calculation (Typical Use) <br /> Variable Value Units Description <br /> Q 556.9 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> • A 138 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> inches per <br /> R 9.22 year Deep percolation of rain water <br /> inches per <br /> W 0.05 year Uniform waste water loading for calculation <br /> The following table presents a summary of the assumptions for the nitrate loading <br /> calculation for potential full occupancy of the Site, as presented in Plate 12: <br /> • LOGE 1708 Page 15 <br />