Laserfiche WebLink
0 0 <br /> ' Nitrate Mass Balance Calculation: <br /> Standard Septic System (Nw = 26 mg/L-N) <br /> ' Data Input: <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Quantity(Q): 7,083 gals/day, Denitrification(d): 15.0% —�— <br /> Effluent Stream(N,): 26.0 mgt-N Deep Perc.of Rain (R): 5.01 in/yr <br /> Site Area(A): 14.0 Acres Waste Loading(W): 6.80 in/yr <br /> Result: <br /> Mass Balance(NE): 13.1 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> ' Percent of MCL Nitrate as N 131%N <br /> Equations: <br /> ' (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 qal 1 year 43,560 ft2 1 ft (A) <br /> 6.8 in/yr(site) =7,083 gai/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/14 acres) <br /> N,= WN..,(1-d)+RN Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 13.15 mg/L-N=((6.8 in/yr x 26 mg/L-N x(1-0.15))+(5.01 in/yr x 1 mg1L-N))/(6.8 in/yr+5.01 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(13.15 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr)(6.8 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(26 mg/L-N). <br /> 'd= Fraction of nitrate-N loss due to denitrification in the soil(15%). <br /> R= Uniform deep percolation of rainfall(5.01 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 26 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> 3. Estimated deep percolation of rainfall is 5.01 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> HERS 1 <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> MCC} MCAL SERNLES-EN INEERM6 L/90WTO WEB Z W <br /> y M—a Ln.Lo<I,CA 126 O <br /> pm�x>-mm q �P <br /> 'TEO� <br /> Plate 4 <br />