Laserfiche WebLink
l\_.te Mass Balance Calculation, Parcel <br /> (8-People, add Second Dwelling Unit) <br /> Data Input: <br /> Occupancy: 8 people Waste Loading(W): 0.05 in/yr <br /> Gallons Per Person Per Day: 50 gpd/person Site Area(A): 110.00 Acre <br /> Effluent Quantity(Q): 400 Gals Concentration Rain(Nb): 0.17 mgt-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 25% <br /> Deep Perc.of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 0.41 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mgt-N <br /> Percent of MCL Nitrate as N 4 <br /> Equations: <br /> 8 people x 50 gafs/day/person =400 gals/day Find E-Muent Quantity(0) <br /> (W) in = (Q) gal x 1 fe x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft' 1 It (A) <br /> 0.05 in/yr(site)=400 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/110 acres) <br /> N,= WN_It-d)+RN. Hantzsche-Fennemom Eouation(Nc) <br /> W+R <br /> 0.41 mg/L-N=((0.05 in/yr x 45 mg/UN x(1-0.25))+(6.84 in/yr x 0.17mg/L-N))/(0.05 in/yr+6.84 in/yr) <br /> Variables: <br /> INC=Average nitrate-N concentration(mgA)of combined effluent and rainfall percolate(0.41 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(0.05 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(25%). <br /> R=Uniform deep percolation of rainfall(6.84 m/yr). <br /> Nb= Background nitrate-N concentration of rainfall(0.17 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 3. Estimated deep percolation of rainfall is 6.84 inlyr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> NEIL O.ANDERSON 8 ASSOC.,INC. <br /> �o¢w�usw+.x i <br /> na, nA �+.roc <br /> PLATE 3 <br />