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Mr. John Parks <br /> Page 5 <br /> NITRATE LOADING CALCULATIONS <br /> Simplified Prediction of Ground Water Nitrate Buildup From Effluent Disposal: <br /> Assumptions <br /> I. Nitrate concentration of effluent stream is generally between 40 to 60 mg/I as N. <br /> 2. Fraction of nitrate loss due to denitrification in the soil.is assumed range between 10%to 25%. <br /> 3. Assume deep percolation of rainfall=Monthly Precipitation- ET-2 inches(assume for runnoff). <br /> i-ligh estimate=6.31 inches, low estimate=5.86 inches. See precipitation sheet for Lodi, CA. <br /> f <br /> 4. Assume average nitrate concentration of rainfall is 0.17 mg/l as N. <br /> Mass Balance Equation_' <br /> WX�(1-d) +PM <br /> N` W+R <br /> N,= Resultant ave. nitrate concentration (mg/I)of combined effluent and rainfall percolate. <br /> 1V=Uniform waste water loading for study area(in/yr). <br /> Waste quantity is 35 persons using 35 gallons per day= 1,225 gallons per day. <br /> _1,225gal * 365day * 1 * lac * 1 ft3 12in <br /> W ]day ]yr 150ac 43,560 ft 1 7.48gal 1 ft <br /> W= 0.11 ire/yr. <br /> Nw=Total nitrate concentration of waste water percolate =40 mg/1 as N to 60 mg/l as N. <br /> d= Fraction of nitrate loss due to denitrification in the soil= 10%to 25%. <br /> R=Uniform deep percolation of rainfall=5.86 to 6.31 in/yr. <br /> Nh= Background nitrogen concentration of rainfall=0.17 mg/1 as N. <br /> Non Conservative Estimate: <br /> (0.11in/yr•X40mg/lXI-0.25)+(6.31in/yrXO.17mg/ l) <br /> N, — = 0.68 mg/ 1 as N011 in/yr +6.31 in/yr) <br /> Conservative Estimate: <br /> _(O.Ilin/yrX60mg/1X1-0.10)+(5.86in/yrXO,17mg/1) <br /> � N (0.1]in/yr +5.86in/yr) = 1.16 mg/1 as N <br /> a <br />