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NITRATE LOAD[Nty_�_ALCULAT[ONS FOR CATHOLIC DIOCIE-�E OF STOCKTON <br /> HWY 99 AND HARNEY LN <br /> Simplified Prediction of Ground Water Nitrate Buildup From Effluent Disposal: <br /> Assumptions <br /> 1. Nitrate concentration of effluent stream assumed to be 40.0 mg/I. <br /> L_ <br /> 2. Waste loading determined from the following usage provided by the diocese: <br /> Day Est. People a ons person ay Total <br /> Wed. 30(Chapel) 5 150 <br /> Sat. 400(Chapel) 5 2000 <br /> Sat. 250(Multi-Purpose) 10 2500 <br /> Sun. 200(Chapel) 5 1000 <br /> Wk. End 100(Multi-Purpose) 10 1000 <br /> Total 6650 <br /> 3. Fraction of nitrate loss due to denitrification in the soil is conservatively assumed to be 0%. <br /> 4. Assume 100%percolation of rainfall since it will be supplemented by irrigation water. Amount of <br /> average annual rainfall based on County of San Joaquin, Department of Public Works, Mean <br /> Annual Precipitation,June 1997. <br /> 5. Due to lack of tests, conservatively assume average nitrate concentration of rainfall is 0.5 me. <br /> Mass Balance <br /> WNw(1—d)+ RX <br /> N, _ <br /> W+ R <br /> N,=Resultant ave. nitrate concentration (mg/1)of combined effluent and rainfall percolate. <br /> 6V=Uniform waste water loading for study area(in/yr) <br /> _ 6,650ga1 52wk 1 lacre l2in _ <br /> 1( 1( 1( Z 9.8in1 yr <br /> W \ wk )` 1 r J\9.7acres/`43,560 t t2)(11 ft <br /> y f <br /> Nw=Total nitrate concentration of waste water percolate =40 mg/I <br /> d=Fraction of nitrate loss due to denitrification in the soil=0% <br /> R=Uniform deep percolation of rainfall= 15.5 in/yr <br /> N,,=Background nitrogen concentration of rainfall=0.5 mg/I <br /> (9.8in l yr)(40mg/1)(1—0.0) +(15.5in l yr)(0.5mg/1)_ <br /> = 15.8 mg/1 <br /> (9.8in l yr+15.5in l yr) <br /> GER <br />