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Project No: 2062 <br />Plate No.: 18 <br />Date: May 14, 2021 LIVE OAK <br />GEO ENVIRONMENTAL INC, <br />Nitrate Loading Calculation, <br />Parcel D (Existing Modular <br />Home Only) <br />8458, 8450 & 8200 E. Jahant Rd. <br />& 23110 N. Dustin Rd. <br />Acampo, CA <br />Nitrate Loading Calculations: <br />Variable Value Units Description <br />Q 200 gallons per day Effluent flow rate from report <br />Nw 35 mg/L-N Effluent stream concentration from report <br />A 40 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 9.42 inches per year Recharge rate of rainfall from report (evapotranspiration method) <br />W 0.1 inches per year Uniform waste water loading for site calculation result <br />Nc 0.3 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (V14: <br />(VV) = (Q) gal x *ft! 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 />0.07 in/yr (site) = 200 gal/day x (1 cu-Cl 7.48 gals) x (365 days/1 year) x (1 acre / 43,560 sq-ft) x (12 in / 1 ft) x (1 site /40 acres) <br />Hantzsche-Fennemore Equation (Nc): <br />Nc = WN(1-d)+RNi, <br />W+R <br />0.33 mg/L-N = ((0.07 in/yr x 35 mg/L-N x (1 - 0.35)) + (9.42 in/yr x 0.17mg/L-N)) / (0.07 in/yr + 9.42 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 9.42 in/yr. <br />Background nitrate-N concentration of rainfall is 0.17 mg/L-N.