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n <br /> Soil Suitability And Nitrate Loading Evaluation Page 5 <br /> Pa-0600569 <br /> I 17200 Byron Road (APN # 209-150-23) <br /> ` Tracy, California <br /> January 14, 2008 20-1889 <br /> evaluation of nitrate loading which uses the Hantzshe mass balance equation (source: <br /> Predicting Groundwater Nitrate-Nitrogen Impacts, Hantzshe and Finnemore; 1992). <br /> 1 <br /> ANG= [I(N,,)(I4J) +_R.(Nb)] <br /> NC = Calculation of nitrate-nitrogen in groundwater resulting from leach field <br /> source and precipitation (mg/l, as N). <br /> 1 = Volume rat' f r water e Bring the soil averaged over the`gross <br /> eveloped,a <br /> F1 <br /> I =�� 151, al/da (App ante loading calculation) x 365 <br /> � days year x s 17. gall ns x 1 acre/43,560 ft,48 x 12 inches I foot x 1/10 <br /> F. a s , <br /> = 0.21 inches/year •„i ? - <br /> 9 _4>, <br /> Fj � <br /> NW = Nitrate concer nt ation of nitrified leach-field effluent is assumed to be on <br /> the order of.70 mfg/l (per Soil Suitability &Nit ate Loading Study report <br /> Fj <br /> by Kleinfelder,_1c., dated August 30, 2005). / <br /> \D — Fraction of nitrate-nitrogen los��Q�.20 (p.r <br /> entrification of leach field effluent <br /> J is assumed to be on the order o Hantzsh e and Finnemore <br /> (1992) 0.10 to 0.35 is typical). <br /> R = Average recharge rate due to rainfall = 12.4 i ches per Y (taken taken as 80% <br /> � <br /> of annual 15.5 inches, 20% assumed to fsite per <br /> & <br /> Fjevapotranspiration). <br /> Nb — Background nitrate nitrogen concentratioCrainfallrecharge at the <br /> water table is assumed to be on the order (Technical <br /> Memorandum, Hydrologic and Soil Invethe Chico Urban <br /> Area by Dames and Moore, April 1996). <br /> Fi <br /> Our nitrate calculation is as follows: using N = I 1-D + R + <br /> i <br /> F N, Q [0.2 (70)(1-0.20) + 12.4 (0.5)] /(0.21+12.4) 1.42 m Il ON <br /> e calculated nitrate (1.42 mg/L as N)Ffor=groundwater Nitrate-Nitrogen Impacts is <br /> Fj <br /> below the State drinking water standard o-N 0 mg/L for nitrogen <br /> r U` f <br />