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bw ` May 25, 2004 NOA Project Number: E04061 Page 16 tw Denitrification is expressed as a percentage, and the normally accepted range is 10 to 35 percent. Soils with higher clay content, moist soil conditions,high pH, and organic material denitrify by ` about 35 percent, and soils with high sand content and fast percolation rates are estimated to denitrify at a lower rate, about 10 percent tol5 percent. ` A typical denitrification factor of 25 percent was used for the Site. 7.4 Agricultural Contribution r Since the Site is not used for agriculture,no agricultural contribution has been considered for this analysis. 6. 7.5 Nitrate Loading Scenarios A nitrate loading scenario was performed to determine the impact from the proposed development. The scenario utilizes the variables discussed previously which represent the estimated conditions and uses associated with this project. The following table presents a summary of the nitrate loading calculations, as presented in Plates 9 through 37. Table 6. y Summary of Nitrate Mass Balance Analysis. Lot Result Acres Average Daily Effluent Leachtield Deep Percolation r (Nc)* Flow(Q) Concentration Denitrification of Rainfall(R) (Table 3) (Nw) (d) (Plate 8) 31 5.7 mg/L-N 9.82 560 gpd 35 mg/L-N 25% 3.38 in 32 5.7 mg/L-N 9.82 560 gpd 35 mg/L-N 25% 3.38 in 33 5.7 mg/L-N 9.67 560 gpd 35 mg/L-N 25% 3.38 in 34 5.7 mg/L-N 9.68 560 gpd 35 mg/L-N 25% 3.38 in 35 5.9 mg/L-N 9.21 560 gpd 35 mg/L-N 25% 3.38 in 36 5.9 mg/L-N 9.21 560 gpd 35 mg/L-N 25% 3.38 in 37 5.8 m&/LN 9.48 560 gpd 35 mg/L-N 25% 3.38 in 38 5.8 mg/L-N 9.47 560 gpd 35 mg/L-N 25% 3.38 in 39 5.4 mg/IN 10.42 560 gpd 35 mg/L-N 25% 3.38 in 40 5.8 mg/L-N 9.6 560 gpd 35 mg/L-N 25% 3.38 in 41 6.0 mg/L-N 8.92 560 gpd 35 mg/L-N 25% 3.38 in 42 5.9 mg/L-N 9.21 560 gpd 35 mg/L-N 25% 3.38 in