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June 13, 2006 <br /> NOA Project Number: E05164A <br /> flow rate estimate. The flow rates selected for the uses associated with this project are presented <br /> next. <br /> Table 1. <br /> Typical Quantity of Effluent <br /> U! Total People per Average Quantity per Average Daily Flow i <br /> Category Day Person Per Parcel <br /> J <br /> (�R,��dential r 3 residents*70-gpd/•resident <br /> i Parcel 0 70 galesdent 2 10 d <br /> $P <br /> Commercial 202 2.0 gal/day/customer (200 customers*2.0 gpo)_+1 U —. - <br /> Parcel 1 14 al/da /em io ee 2 employees* 14 d'=42$gpa <br /> Note —gpd is gallons per day. <br /> 0 For Parcel 1, the total daily waste water quantity is 428 gallons per day. For Parcel 2, the total daily <br /> waste water quantity is 210 gallons per day. <br /> F! The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is <br /> estimated that commercial use will have higher concentrations of total nitrogen when compared to <br /> Presidential use. It is estimated that the average concentration for total nitrogen in waste water for <br /> the project is approximately 60 mg/L-N over the long term. <br /> F1 3.4.2 Derliuification 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 (N� to the atmosphere. <br /> 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 /> x estimated to denitrify at a lower rate, about 10 percent to 15 percent. <br /> A typical denitrification factor of 15 percent was selected for the Site due to the presence of silty <br /> sands. <br /> 3.5 Nitrate Loading Scenario <br /> A nitrate loading scenario was performed to determine the impact from the proposed pro)ect. 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 (Plate 9). <br /> a <br /> 5 <br /> i <br />