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Nitrate Loading Calculations: <br /> Variable Value Units Description <br /> Q 400 gallons per day Effluent flow rate from report <br /> Nw 35 mg/L-N Effluent stream concentration from report <br /> A 1.64 acres Site area from report <br /> Nb 0.103 mg/L-N Concentration of rain water from report <br /> d 0.25 constant Denitrification factor from report <br /> R 4.39 inches per year Recharge rate of rainfall from report(evapotranspiration method) <br /> W 3.3 inches per year Uniform waste water loading for site calculation result <br /> Nc 11.3 mg/L-N RESULT: Long-term average concentration of percolating effluent <br /> Find Variable(W): <br /> (W) b_ = (Q) " x _JJL3 x 365365 day(s) x 1 acre x 12 in x 1 site <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre(s) <br /> 3.28 in/yr(site)=400 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/1.64 acres) <br /> Hantzsche-Fennemore Equation(Mc): <br /> W+R <br /> 11.28 mg1L-N=((3.28 in/yr x 35 mg/L-N x(1-0.25))+(4.39 in/yr x 0.103mg/L-N))/(3.28 in/yr+4.39 in/yr) <br /> Assumptions: <br /> 1. Total nitrogen concentration of influent waste stream is 35 mg/L-N. If different influent concentrations exist,use weighted average <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is 25%. <br /> 3. Estimated deep percolation of rainfall is 4.39 in/yr. <br /> 4. Background nitrate-N concentration of rainfall is 0.103 mg/L-N. <br /> Nitrate Loading Calculation Plate No.: 18 <br /> Project No: 2637 <br /> Wongphiboonrat Property <br /> LIVE OAK 23304 S.Hansen Rd. Date: June 22,2026 <br /> Tracy,CA <br /> GEO ENVIRONMENTAL INC. r--- I <br />