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March 3, 2005 Q <br /> NOA Project Number:-E040155A <br /> Category tal Feo�e Average Quantity per Average Daily Flow <br /> Person Per Parcel <br /> Visitor Use 133 5 gal/day/person 133 visi zs erson* 1 <br />' per week week/7 days <br /> = 95 gpd <br /> F t Note —gpd is gallons per day, s a factor to correct flow from weekly to daily. <br /> For thep roperty, the total daily waste water quantity is 305 gallons per day. <br /> verage nitrogen concentration of domestic waste water is normally considered to be <br /> -85 mg/L-N ( tes and.Tchobanoglous, 1998). For the purposes of the nitrate loading estimate, <br /> FI the long average concentration for total nitrogen in waste water is estimated to be 45 mg/L-N. <br /> � y f`j 3.4.2 Derritrifr"catiorl Estimate <br /> I _J <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 /> 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 /> estimated to denitrify at a lower rate, about 10 percent to 15 percent. <br /> /A denitrification factor of 25 percent was selected for the Site because of the hardpan just below the <br /> surface. <br /> /3.5 Nitrate Loading Scenario <br /> 3 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 /> F1 uses associated with this project. The following table presents a summary of the nitrate loading <br /> calculation for each parcel. <br /> Table 2. <br /> �"�Y Su a of Nitrate Mass Balance Analysis. <br /> Pla Result Act Average Daily Effluent Leachfield Deep <br /> F (Nc) * (A) Flow(Q) Concen- Denitrifi- Percolation of <br /> (mg/L-N) (Table 3) tration(Nw) cation(d) irrYall <br /> (gp ) (Plate 9) (in.) <br /> 1 0\1 1 10.0 1.58 305 45 2517 6.84 <br /> * Maximucontaminant level CL) for nitrate in drinking Ovate 10 mg/L-N. <br /> 6 <br /> � 1 <br /> l <br />