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Soil Suitability&Nitrate Loading Evaluation CTE Job#25-1256G <br /> New Septic Leech Lines <br /> 9490 E Schmeidt Rd <br /> Lodi, California <br /> June 29, 2022 Page 7 of 10 <br /> and 10 mg/l as Nitrogen (N) in groundwater. Presented below is our evaluation of nitrate loading <br /> which uses the Hantzshe mass balance equation (source: Predicting Groundwater Nitrate-Nitrogen <br /> Impacts, Hantzsche and Finnemore; 1992) attached as Appendix C. <br /> Nc = Calculation of nitrate-nitrogen in groundwater resulting from leach field source and <br /> precipitation(mg/l, as N). <br /> NC _ [I (NW) (1-D) +R(Nb)] / (I+R) <br /> Itotat = Volume rate (Gal/day) of wastewater entering the soil a residence= 150 Gallons per <br /> bedroom per day(per SJC Onsite Wastewater Treatment Systems Local Agency <br /> Management Program, April 2016): <br /> 150 x 4= 600 gal/day. <br /> Itotat= Volume rate converted to inches/year and averaged over the gross developed <br /> area(using 1/10 acre): <br /> =600 gal/day x 365 days/year x ft3/7.48ga1 x 1 acre/43,560 ft2 x 12 in/ft x <br /> 1/10 acre <br /> 0.807 inches/year. <br /> NW= Nitrate concentration of nitrified leach-field effluent for residential properties is <br /> assumed to be on the order of 40 mg/1 (average is 35 to 45 mg/1 per Hantzsche and <br /> Finnemore; 1992). <br /> D= Fraction of nitrate-nitrogen loss due to denitrification of leach field effluent is <br /> assumed to be 0.25 (most representative of typical onsite sewage <br /> disposal situations per Hantzshe and Finnemore, 1992 &U.S. EPA, 1980, <br /> 1981). <br /> C�L,INC <br />