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September 50,200 <br /> NOA Proiecr.Nuinber: T-,071,17A <br /> Weighted Average for Total N-tioen Concentrationn <br /> 14,700gpd X 45 r:slr/L-V="1,50 <br /> 13Grgp�R 65rrg/l✓-1 _8,450 <br /> 669,950/1 ,330,pica°=4517 my/L-N <br /> .3.4.2 Denircifcadnn-Eqd s4are <br /> Deninification is an important process which occurs within the leach field whereby certain bactelia <br /> Utilize the oxygen in the nitrate ;NO,' and release nitrogen gas (N I to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <br /> percent.. Soils Ivida higher clay content,moist.soul conditions,lugh pId, and organic maternal. <br /> denitriAr by about. 35 percent, and soils with high sand content and fast percolation rates are <br /> estimated to deniuifv at a lower rate, about 10 percent to 1.5 percent,. <br /> A typical denitrification factor:of 25 percent was selected for the site due to the presence of the Cine- <br /> grained soih encountered on site. <br /> 3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was perfor:rned to determine the impact from the proposed project. The <br /> scenatio utilizes the variables discussed previously wh�cb tepresent the csr_imated conditions and <br /> uses associated with this project_ The following table presents a summaxy of the nitrate loading <br /> calculation. <br /> Table 3. <br /> Summary of Nitrate Mass )Balance Analysis. <br /> Rcsult Acres Average Daily Efflucnt Coneen- Leachfield Deep Percolation of <br /> (NC)* (A) Flow(Q) (Cable 1) tra"o+n(NW) Denitrifi- Rainfall(R) <br /> (mg/J. N) (glid) (mg/L-N) cation (d) (Plate 9) (in.) <br /> 21.2 22.6E 11,830 45.65 25% 576 <br /> 'NLInfulim conraininant)cool(MC,F)for nirraee ice dried iiig warc.t is'1 Q mg/L-N. <br /> 3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> The result of the nitrate loading balance indicates tbat the ptoposed development is likely to cause a <br /> build up of r,.itr:a.te in the grouted water above 10 mg/L-N over the long tvan <br /> Due to the relatively flat surface of the subject property, the poterbs.l Usk of surfacing effluent; <br /> effecting surface watei:.is expected to be minimal. <br /> 6 <br />