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Sep 08 98 11 : 2la Neil 8r derson (2091 333-8303 p. 10 <br /> NITRATE LOADING CALCULATIONS <br /> - Sutter Home Winery,914198 <br /> Simplified Prediction of Ground Water Nitrate Buildup From Effluent Dispasal: <br /> f <br /> .4 ssumnlions <br /> 1. Nitrate concentration of effluent stream based on tests performed on adjacent Sebastiani winery <br /> effluent stream. <br /> t 2. Fraction of nitrate loss due to denitrification in the soil is assumed to be 25%because the effluent <br /> will be spray applied(moist conditions)to former farmland(high organic carbon substrate). <br /> l- 3. Assume 100%percolation of rainfall. Amount of average annual rainfall based on County of San <br /> M _ Joaquin, Department of Public Works,Mean Annual Precipitation,June 1997. <br /> 4. Due to lack of tests,conservatively assume average nitrate concentration of rainfall is 0.5 mg/l. <br /> Mass Balance <br /> WN.(1--d)+RM <br /> AT, = <br /> W+R <br /> N,=Resultant ave. nitrate concentration(mg/1)of combined effluent and rainfall percolate. <br /> W= Uniform waste water loading for study area(inlyr) <br /> Current estimates are 10,000 gal/day of winery processing effluent spray applied to 30 acres. <br /> 10,000ga7}(3b5day I l acre l tin <br /> W <br /> day <br /> 1l I r 30acres�t 43,Sd4 t2 1 t - 4�`n yr <br /> y f f <br /> Nu.=Total nitrate concentration of waste water percolate =36 mg/1 <br /> d=Fraction of nitrate loss due to denitrification in the soil=25% <br /> R=Uniform deep percolation of rainfall= 16 intyr <br /> jNb=Background nitrogen concentration of rainfall=0.5 mg/l <br /> r, <br /> N _ (45in 1 yr)(36mg/l)(1-0.25)+(16in/yr)(0.5mg I l) _6.3 mgrr <br /> (4.5in/yr+ 16in I yr) <br /> F <br /> '-' peat S <br /> P 0 <br />