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Project No: 2121 <br />Plate No.: 16 <br />Date: June 8, 2021 LIVE OAK <br />GEO ENVIRONMENTAL INC. <br />Nitrate Loading Calculation, <br />Parcel A (Two Houses) <br />Martin Property <br />6103 W. Delta Ave. <br />Tracy, CA <br />Nitrate Loading Calculations: <br />Variable Value Units Description <br />Q 500 gallons per day Effluent flow rate from report <br />Nw 35 mg/L-N Effluent stream concentration from report <br />A 5.00 acres Site area from report <br />Nb 0.17 mg/L-N Concentration of rain water from report <br />d 0.35 constant Denitrification factor from report <br />R 2.25 inches per year Recharge rate of rainfall from report (evapotranspiration method) <br />W 1.3 inches per year Uniform waste water loading for site calculation result <br />Nc 8.6 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (VW: <br />(IN) = (Q) 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 />1.34 in/yr (site) = 500 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 / 5 acres) <br />Hantzsche-Fennemore Equation (Nc): <br />Nc = WN(1-d)+RN, <br />W+R <br />8.61 mg/L-N = ((1.34 in/yr x 35 mg/L-N x (1 - 0.35)) + (2.25 in/yr x 0.17mg/L-N))/ (1.34 in/yr + 2.25 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 2.25 in/yr. <br />Background nitrate-N concentration of rainfall is 0.17 mg/L-N.