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Uct 28 98 06: 24p [Veil finder-son 12091 333-8303 p. 4 <br /> NITRATE LOADING CALCULATIONS <br /> Beneto Office Buildings <br /> Simplified Prediction of Ground Water Nitrate Buildup From Effluent Disposal: <br /> Assumptions <br /> 1. Nitrate concentration of effluent waste water is 40 mg/I. <br /> 2. Fraction of nitrate loss due to denitrification in the soil is conservatively assumed to be 09/6. <br /> 1 Assume 80%percolation of rainfall. Amount of average annual rainfall based on County of San <br /> Joaquin,Department of Public Works,Mean Annual Precipitation,June 1997. percolation based <br /> on soils encountered in out test boring. <br /> 4. Due to lack of tests,conservatively assume average nitrate concentration of rainfall is 0.5 mgn. <br /> 5. When estimating the waste water discharge,truck drivers were reduced by one half due to their <br /> absence during the duy. <br /> Muss Balance <br /> _ WN41-d) I RM <br /> N` 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(in/yr) <br /> Current estimates for 5 full time personnel and 40 truck drivers present only at the beginning and <br /> end of the day arc 750 gal/day of effluent waste water applied to 5.7 acres. <br /> 750 a! 365da 1 lacre 12in 13.2MI <br /> _( <br /> 750gal rY yr <br /> W 1 day ll lyr ��57acresJl <br /> 43,560flZ lft - <br /> M.=Total nitrate concentration of waste water percolate —40 mgll <br /> d=Fraction of nitrate loss due to denitrification in the soil—00/lo <br /> R=Uniform deep percolation of rainfall= 12 inlyr•80%-9.6in/yr <br /> Nr,—Background nitrogen concentration of rainfall=0.5 mg/I ..17. <br /> 132in/yr)(40mg/1)(1- 0.0)+ (9.6in l yr)(0.5mg l 1) ' ' <br /> -23.4 mgll ,�f <br /> 13.2in/yr+ 9.6in/yr) <br /> aDso, <br />