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Nitrate Mass Balance Calculations <br /> Farris Property <br /> Nitrate Loading Calculations: <br /> Variable Value Units Description <br /> Q 420 gallons per day Effluent flow rate from report <br /> Nw 35 mg/L-N Effluent stream concentration from report <br /> A 1.50 acres Site area from report <br /> Nb 1.00 mg/L-N Concentration of percolating recharge waters from report <br /> d 0.20 constant Denitrification factor from report <br /> R 9.20 inches per year Recgarge rate of percolating waters from report <br /> W 3.8 inches per year Uniform waste water loading for site(calculated) <br /> Nc 8.8 mg/L-N RESULT. Long-term average concentration of percolating effluent <br /> Find Variable(W): <br /> (W) in = (Q) gal x 1 ft3 x 365 day(s) x 1 acre x 12 in x 1 site <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre(s) <br /> 3.76 in/yr(site)=420 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/1.5 acres) <br /> Hantzsche-Fennemore Equation(Nc): <br /> N,= WN�(1-d)+RN, <br /> W+R <br /> 8.84 mg/L-N=((3.76 in/yr x 35 mg/L-N x(1-0.2))+(9.2 in/yr x 1 mg/L-N))/(3.76 in/yr+9.2 in/yr) <br /> Assumptions: <br /> 1. Total nitrogen concentration of influent waste stream is 35 mg/L-N. If different influent concentrations exist,use weighted average <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is 20%. <br /> 3. Estimated deep percolation of recharge waters is 9.2 in/yr. <br /> 4. Background nitrate-N concentration of recharge waters is 1 mg/L-N. <br /> LOGE 1844 March 5,2019 <br />