Laserfiche WebLink
Project No: 1909 <br />Plate No.: 14 <br />Date: April 24, 2019 LIVE OAK <br />GEO ENVIRONMENTAL INC. <br />Nitrate Loading Calculation, <br />2 Bedrooms <br />Kumar Property <br />16895W. Grant Line Rd. <br />Tracy, CA <br />Nitrate Loading Calculations: <br />Variable Value Units Description <br />Q 280 gallons per day Effluent flow rate from report <br />Nw 35 mg/L-N Effluent stream concentration from report <br />A 0.94 acres Site area from report <br />Nb 1.00 mg/L-N Concentration of rain water from report <br />d 0.35 constant Denitrification factor from report <br />R 6.17 inches per year Recharge rate of rainfall from report (evapotranspiration method) <br />W 4.0 inches per year Uniform waste water loading for site calculation result <br />Nc 9.6 mg/L-N RESULT: Long-term average concentration of percolating effluent <br />Find Variable (W): <br />(\N) iLL = (Q) g4j 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 />4 in/yr (site) = 280 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 / 0.94 acres) <br />Hantzsche-Fennemore Equation (NC): <br />Nc = WN„(1-d)+RN, <br />W+R <br />9.56 mg/L-N = ((4 in/yr x 35 mg/L-N x (1 -0.35)) + (6.17 in/yr x 1 mg/L-N))/ (4 in/yr + 6.17 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 6.17 in/yr. <br />Background nitrate-N concentration of rainfall is 1 mg/L-N.