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1 <br /> REEVE TRUCKING <br /> Page No. 10 <br /> NITRATE LOADING CALCULATIONS <br /> r. <br /> 3 Simplified Prediction of Ground Water Nitrate Buildup From Effluent Disposal: <br /> Assumptions <br /> 1. Nitrate-N concentration of effluent stream based on estimate of 40.0 mg/i. <br /> Assumption based on work from Hantzsche and Finnemore, 1991 (see footnote no.4). <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> Assumption based on values from Hantzsche and Finnemore, 1991 (see footnote no.4). <br /> 3. Assume 3.5 in/yr deep percolation of rainfall. Reported average rainfall is 14.0 in/yr based on <br /> Soil Conservation Service data for San Joaquin County (see footnote no. 3). Assume 8.5 in/yr <br /> loss due evapotranspiration. Assume 2 in/yr loss due to run off. <br /> r Calculation: (14 in/yr)-(8.5 in/yr)-(2 in/yr) =3.5 in/yr. <br /> ? : <br /> 4. Due to lack of tests,conservatively assume average nitrate-N concentration of rainfall is 0.17 <br /> mg/I. Nitrate-NO3 for rain is 0.5 to 1.0 mg/1. So use 0.75 mg/l Nitrate-NO3. Convert to nitrate-N. <br /> (0.75 mg/l Nitrate-NO3 )/4.43 =0.17 mg/1 nitrate-N. Conversion:(Nitrate NO3/4.43=Nitrate-N). <br /> a Assumption for concentration of rain based on values used by Hantzsche and Finnemore, 1991 <br /> F (see footnote no.4). <br /> r <br /> F <br /> - pERSo <br /> a N <br /> W <br /> a Q � <br /> P <br /> 4S5or% <br /> r .s <br />