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Project No: 1909 <br />Plate No.: 15 <br />Date: April 24, 2019 LIVE OAK <br />GEO ENVIRONMENTAL INC, <br />Nitrate Loading Calculation, <br />3 Bedrooms <br />Kumar Property <br />16895W. Grant Line Rd. <br />Tracy, CA <br />Nitrate Loading Calculations: <br />Variable Value Units Description <br />Q 420 gallons per day Effluent flow rate from report <br />Nw 35 mg/L-N Effluent stream concentration from report <br />A 0.94 acres Site area from report <br />Nb 1.00 mg/L-N Concentration of rain water from report <br />d 0.35 constant Denitrification factor from report <br />R 6.17 inches per year Recharge rate of rainfall from report (evapotranspiration method) <br />W 6.0 inches per year Uniform waste water loading for site calculation result <br />Nc //.7 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (VW: <br />(VV) = (Q) geJ x 1 ft3 x 365 day(s) x 1 acre x 12 in x 1 site <br />yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre(s) <br />6.01 in/yr (site) = 420 gal/day x (1 cu-ft/ 7.48 gals) x (365 days/ 1 year) x (1 acre / 43,560 sq-ft) x (12 in / 1 ft) x (1 site / 0.94 acres) <br />Hantzsche-Fennemore Equation (Nc): <br />Nc = WN„(1-d)+RNi, <br />W+R <br />11.73 mg/L-N = ((6.01 in/yr x 35 mg/L-N x (1 -0.35)) + (6.17 in/yr x 1 mg/L-N))/ (6.01 in/yr + 6.17 in/yr) <br />Assumptions: <br />Total nitrogen concentration of influent waste stream is 35 mg/L-N If different influent concentrations exist, use weighted average <br />Fraction of nitrate-N loss due to denitrification in the soil is 35%. <br />Estimated deep percolation of rainfall is 6.17 in/yr. <br />Background nitrate-N concentration of rainfall is 1 mg/L-N.