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10 June 2014 <br /> AGE Project No. 14-3035 <br /> Page 14 of 16 <br /> Assumptions: <br /> I = 45,900 gallons = 6,148.4 cubic feet wastewater _ [(18 acres x 43,560 feet2) _ 12 <br /> inches] = 0.094 inches/year. <br /> NW = 65 mg/L-N d = 20 percent denitrification R = 12 inches/year <br /> Nb = 0.1 milligram per liter <br /> Nr = [0.094 inches/year x 65 mg/L-N (1-0.20)] + (12 inches/year x 0.1 milligram per liter) <br /> (0.094 inches/year + 12 inches/year) <br /> Nr = 6 = 12.09 = 0.496 <br /> Nr = 0.496 ppm nitrogen (1\1O3N.) <br /> RESIDENTIAL <br /> The Hantzsche / Finnemore (Nr) equation for residential home application: <br /> Nr = IxNw (1-d)+ RxNb = (I+R) <br /> Nr = The average concentration of nitrate-nitrogen in the recharged waste water parts <br /> per million of nitrate-nitrogen. <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area <br /> (acres) in inches per year. The total wastewater volume for proposed project will be 360 <br /> gpd x 365 days of proposed operation = 131,400 gallons _ 7.48 gallons per cubic foot = <br /> 17,566 cubic feet of wastewater. Does not account for evapotranspiration likely to occur. <br /> NW = Total nitrogen concentration of wastewater at 45 mg/L-N based on the average <br /> discharge. Accounting for the loss of mg/L-N in the septic tank at 15% 45-15%= 38.255 <br /> and the loss from the biomat at 10% 38.25 - 10% = 34.425 mg/L-N <br /> d = Fraction of nitrogen concentration removed from the wastewater due to <br /> denitrification within the soil (20 percent for clay type soils). <br /> R = Average rainfall rate per year: 12 inches. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, from wastewater <br /> influences. <br /> Advanced CeoEnvironmental,Inc. <br />