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project. The first scenario includes the daily flow from the primary residence and <br />second dwelling unit only, while the second scenario includes the accessory dwelling <br />unit as well. <br />The following table presents a summary of the assumptions for the nitrate loading <br />calculations for the Site, as presented in Plates 14 and 15. <br />Table 4. Assumptions for Nitrate Loading Calculations <br />Variable <br />Value <br />Units <br />Description <br />Q <br />400 <br />gpd <br />Effluent flow rate, 2 homes <br />Q <br />550 <br />gpd <br />Effluent flow rate, 2 homes plus ADU <br />Nw <br />35 <br />mg/L-N <br />Effluent stream concentration <br />A <br />2.70 <br />acres <br />Site area <br />Nb <br />0.136 <br />mg/L-N <br />Concentration of rain <br />d <br />0.25 <br />constant <br />Denitrification factor <br />R <br />2.94 <br />inches per year <br />Recharge rate of rainfall <br />W <br />2.0 <br />inches per year <br />Uniform waste water loading (calculated), 2 homes <br />W <br />2.7 <br />inches per year <br />Uniform waste water loading (calculated), 2 homes plus <br />ADU <br />The details of the nitrate loading calculations are included in Plates 14 and 15. The <br />results of the calculations are presented in the following table. <br />Table 5. Results of Nitrate Loading Calculations <br />Variable Value Units Description <br />Nc 10.7 mg/L-N Long-term average concentration of percolating effluent, <br />2 homes <br />Nc 12.7 mg/L-N Long-term average concentration of percolating effluent, <br />2 homes plus ADU <br />Based on the methods and assumptions described, the use of existing and proposed <br />septic tanks and drain field systems on the Site yields a calculated buildup of nitrates in <br />LOGE 2234 Page 12 <br />