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Nitrate Loading Calculations: <br />Variable Value Units Description <br />300 gallons per day Effluent flow rate from report <br />Nw 35 mg/L-N Effluent stream concentration from report <br />A 1.72 acres Site area from report <br />Nb 0.20 mg/L-N Concentration of rain water from report <br />0.35 constant Denitrification factor from report <br />9.42 inches per year Recharge rate of rainfall from report (evapotranspiration method) <br />2.3 inches per year Uniform waste water loading for site calculation result <br />Nc 4.7 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (W): <br />(W)i=(Q)gjxjj2 x 365 dav(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 />2.34 in/yr (site) = 300 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 / 1.72 acres) <br />Hantzsche-Fennemore Equation (Ng): <br />= <br />W+R <br />4.69 mg/L-N = ((2.34 in/yr x 35 mg/L-N x (1 - 0.35)) + (9.42 in/yr x 0.2mg/L-N))/ (2.34 in/yr + 9.42 in/yr) <br />Assumptions: <br />Total nitrogen concentration of influent waste stream is 35 mg/L-N <br />Fraction of nitrate-N loss due to denitrification in the soil is 35%. <br />Estimated deep percolation of rainfall is 9.42 in/yr. <br />Background nitrate-N concentration of rainfall is 0.2 mg/L-N. <br />If different influent concentrations exist, use weighted average <br />Nitrate Loading Calculation <br />Chapman Property <br />4214 E. Liberty Rd. <br />Galt, CA <br /> <br />Plate No.: 13 <br /> <br />Project No: 20-59 <br /> <br />LIVE OAK <br />GEO ENVIRONMENTAL INC. <br /> <br />Date: February 5, 2021 <br />