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A denitrification factor of 30 percent was selected for the Site because of the fine- <br /> grained nature of the shallow soil at the proposed septic system location. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the project to <br /> ground water. The scenario utilizes the variables discussed previously, which represent <br /> the estimated conditions and uses associated with this project. The following table <br /> presents a summary of the assumptions for the nitrate loading calculation for the Site, <br /> as presented in Plate 11. <br /> Table 4. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 3,360 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 4.04 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.30 constant Denitrification factor <br /> inches per <br /> R 6.56 year Deep percolation of rain water <br /> inches per <br /> W 11.18 year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 11. The results of the <br /> calculation are presented in the following table. <br /> LOGE 1623 Page 10 <br />