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percent, and soils with high sand content tend to denitrify at a lower rate of about 10 <br />percent. <br />A denitrification factor of 35 percent was selected for the Site because of the clay soil <br />strata present at the percolation test locations. <br />Nitrate Loading Estimate <br />Three nitrate loading scenarios (Parcel 1, Parcel 2 no development, Parcel 2 with two <br />houses) were employed to determine the impact from the proposed project to ground <br />water. The scenarios utilize the variables discussed previously, which represent the <br />estimated conditions and uses associated with this project. The following tables present <br />a summary of the assumptions for the nitrate loading calculations for the Site, as <br />presented in Plates 14 through 16. <br />Table 6. Assumptions for Nitrate Loading Calculation, Parcel 1 <br />Variable Value Units Description <br />Q <br />150.7 <br />gpd <br />Effluent flow rate <br />Nw <br />35.2 <br />mg/L-N <br />Effluent stream concentration <br />A <br />2.011 <br />acres <br />Site area <br />Nb <br />0.15 <br />mg/L-N <br />Concentration of rain <br />d <br />0.35 <br />constant <br />Denitrification factor <br />R <br />9.42 <br />inches per year <br />Recharge rate of rainfall <br />W <br />1.0 <br />inches per year <br />Uniform waste water loading (calculated) <br />LOGE 2150 Page 14 <br />