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Project No: 1906 <br />Plate No.: 13 <br />Date: March 13,2019 LIVE OAK <br />GEO ENVIRONMENTAL INC. <br />Nitrate Loading Calculation <br />(Evapotranspiration Reduction Method) <br />Sandoval Property <br />4845 Harvest Rd. <br />Acampo, 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 1.00 acres Site area from report <br />Nb 1.00 mg/L-N Concentration of percolating recharge water from report <br />d 0.25 constant Denitrification factor from report <br />R 12.6 inches per year Recharge rate of percolating waters from report (evapotranspiration method) <br />W 5.6 inches per year Uniform waste water loading for site calculation result <br />Nc 8.8 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (W). <br />(VV) = (Q) gal x *ft2 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 />5.65 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 / 1 acres) <br />Hantzsche-Fennemore Equation (Nc): <br />= VVN(1-d)+RN5 <br />W+R <br />8.81 mg/L-N = ((5.65 in/yr x 35 mg/L-N x (1 - 0.25)) + (12.6 in/yr x 1 mg/L-N)) (5.65 in/yr + 12.6 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 25%. <br />Estimated deep percolation of recharge waters is 12.6 in/yr. <br />Background nitrate-N concentration of recharge waters is 1 mg/L-N.