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r March 15,2007 <br /> NOA Project Number: E07031A <br /> For the subject property, the total daily waste water quantity is 69 gallons per day. Because the / <br /> operation will only be open six days a week,a sixth-sevenths conversion averages the daily flow to <br /> r, 59 gallons per day. <br /> The dverage total nitro`05LICIcentrad n of domestic waste water is normally considered to be <br /> (20-85 mg/L-N with to 45 /L-N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimated that co cial use have higher concentrations of total nitrogen when compared to <br /> residential use. Itis es ' e that the average concentration for total nitrogen in waste water for <br /> the project is approximately 0 mg -N over the long term. <br /> 3.4.2 Denitriffcadon Estimate <br /> rr <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NOS and release nitrogen gas (N� to the atmosphere. <br /> ` Denitrification is expressed as a percentage,and the normally accepted range is 10 percent to 3 <br /> percent Soils with higher clay content,moist soil conditions,high pH,and organic material <br /> denitrify by about 35 percent, and soils with high sand content and fast percolation rates are <br /> ` estimated to denitrify at a lower rata, about 10 percent to'15 percent. <br /> A typical denitrification factor of 20 percent was selected for the site due to the presence of silty <br /> ` sands with some clay. <br /> 3.5 Nitrate Loading Scenario <br /> Anitrate loa ' scenario was performed to determine the impact from the proposed project. The <br /> scenario es the ' bles discussed previously which represent the estimated conditions and <br /> uses as dated with project The following table presents a summary of the nitrate loading <br /> calculi 'on (Plate 9)., <br /> Table 2. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result Acres Average Daily Effluent Concen- Leachfield Deep Percolation of <br /> (Nc)* (A) Flow(Q) (Table 1) tration(Nw) Denitrifi- Rainfall(R) <br /> (m L-N) (gpd) (mg/L-N) cation(d) (Plate 9) (in.) <br /> 5.3 .81 59 70 20% 11.69 <br /> M um contaminant level(MCL) for nitrate in drinking water is 10 mg/L-N. <br /> 3.6 Impact of Nitrate Loading to Nearby Water Sources <br /> Since the Site is relatively flat we o not foresee percolating effluent affecting any surface water <br /> resources. <br /> 5 <br />