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Mencarini Property Page 12 of 14 <br /> Our Project Number: LG5080538 <br /> August 26, 2008 <br /> J,--,-2 Denitrification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain <br /> bacteria utilize the oxygen in the nitrate (NO3) and release nitrogen gas (Nz) to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to <br /> i <br /> 35 percent. <br /> Soils with higher clay content, moist soil conditions, high pH, and organic material denitrify by <br /> about 35 percent, and soils with high sand content and fast percolation rates are estimated to <br /> denitrify at a lower rate, about 10 percent to 15 percent. <br /> rt <br /> "detrification factor of 25 percent was selected for the Site because of the silty nature of the <br /> soils. <br /> L2:3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed project. <br /> The scenario utilizes the variables discussed previously which represent the estimated <br /> conditions and uses associated with this project. The following table presents a summary of the <br /> nitrate loading calculation for the site, as presented in Plate 8. <br /> Table 5 <br /> Summary of Nitrate Mass Balance Equation <br /> a <br /> Result Average Effluent Leachfieldp <br /> Parcel (Nc)* Acres(A) . Daily Flow Concentration �nitrifrcatian Percolation <br /> (meg/ !! . (NW)' of Rainfall <br /> .LQ)(gpd) (d) <br /> (mg/L-N) (R)(in) <br /> 1 1.8 .91 266 85 25% 5.67 <br /> * Maximum contamina MCL)for nitrate in drinking water is 10 mg/L-N. <br /> /--T-3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Since the Site is relatively Flat, we do not foresee percolating effluent affecting any surface <br /> water resources. <br /> 2.4 Discussion of Nitrate Loading Results <br /> 2.4.1 Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading balance <br /> indicates that the proposed development on the parcels should not cause build up of nitrates <br /> in the aquifer above 10 mg/L-N. <br /> 902 Industrial Way• Lodi,CA 95240.209.367.3701 •Fax 209.369.4228 ©2008 Nei!O.Anderson&Associates,Inc <br /> r <br />