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n C) n <br /> riMarch 16, 2006 <br /> NOA Project Number: E0601 1A <br /> Fj' Table 1. <br /> Typical Quantity of Effluent <br /> Category Total People per Average Quantity per Average Daily Flow <br /> Dayr Person Per Parcel <br /> Primary and ! residents*70 gpd/resident <br /> {I Seconday 7 70 gal/day/resident <br /> J Residential =490 gpd <br /> Primary only residents*70 gpd/reside t <br /> F! Residential 4 70 gal/day/resident -280 d �" <br /> Note —gpd is gallons per day. <br /> For the subject prope a three bedroom home and a second dwelling unit, the total daily <br /> !._ waste water quantity i 490 lions per day. For the subject prope `i a three bedroom home <br /> and no second dwe J t, the total daily waste water quantity i 280 Allons per day. <br /> i <br /> The average total nitrogen concentration of domestic waste water is normally considered to range <br /> from 20 to 85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanogious, 1998). For <br /> purp <br /> oses of the nitrate loading-estimate, the long-term average concentration for total nitrogen <br /> naste wateti is estimated to be 40 m /L-N. <br /> 3.4.2 Denitrification Estimate <br /> F, <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NO.) and release nitrogen gas (N� to the atmosphere. <br /> R Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <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 /> FJ estimated to denitrify at a lower rate, about 10 percent to 15 percent. <br /> FA typical denitrification factor of 25 percent was selected for the Site due to the presence of silty <br /> sands with some clay. <br /> Fj3.5 Nitrate Loading Scenario <br /> Two nitrate loading scenarios were performed to determine the impact from the proposed project. <br /> Each scenario utilizes the variables discussed previously which represent the estimated conditions <br /> F'I and uses associated with this project. The following table presents a summary of the nitrate loading <br /> calculations (Plate 6 & 7). <br /> F <br /> FJ <br /> Fi 5 <br />