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February 2,2006 <br /> NOA Project Number: E05058B <br /> Table 1. <br /> Typical Quantity of Effluent for each parcel from Various Sources. <br /> Category• Total People per Average Quantity per Average Daily Flow <br /> Day Person Per Parcel <br /> Residential 7 70 g /day/person 7 residents/day*70 gpd/person i <br /> =490 gpd <br /> Note —gpd is gallons per day. <br /> The total daily waste water quantity for each parcel is estimated to b' 490 ons per day. <br /> The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N with 35 ng/L-N as typical (Crites and Tchobanoglous, 1998). For the purposes of <br /> the nitrate loading estimate, the long-term average concentration for total nitrogen in waste water is <br /> estimated to be 45 mg/L-N. <br /> 3.4.2 Denitrification Estimate <br /> Denitrification is an important process which occurs within the leach field whereby certain bacteria <br /> utilize the oxygen in the nitrate (NO3) and release nitrogen gas (ND to the atmosphere. <br /> Denitrification is expressed as a percentage, and the normally accepted range is 10 percent to 35 <br /> percent. Soils withhigher clay content,moist soil conditions,high pH,and organic material <br /> denitrify by about,35 ercent,and soils with high sand content and fast percolation rates are <br /> estimated to dent * at a lower rate, about 10 percent to,percent. <br /> A typical denitrification factor of 25�ercent was selected for the Site because of the fine grained <br /> soils that exist at the site. <br /> 3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed project. The <br /> scenario utilizes the variables discussed previously which represent the estimated conditions and <br /> uses associated with this project. The following table presents a summary of the nitrate loading <br /> calculation for each parcel. <br /> 5 '-'44 <br />