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TABLE 4.6-5 <br /> NITROGEN MASS BALANCE ANALYSIS <br /> 1. MASS BALANCE FORMULA: <br /> N� _ (1 -D) (W)(NJ + (I)(N,) + (M)(NM) (S)(N,) + (R)(N,) <br /> W + I + M + S + R <br /> 2. TERMS AND ASSUMPTIONS: <br /> N� = Total nitrogen concentration of combined percolate, mg/1 <br /> D = Rate of soil dentrification, (estimated to be 25 percent of applied concentration) <br /> W = Wastewater loading, (estimated at 10,000 gpd or 11.2 ac-ft/yr) <br /> Nw = Total nitrogen concentration of septic tank effluent, (estimated at 40 mg/1) <br /> I = Irrigation water lost to deep seepage from golf course and vineyard (estimated at 10% of applied <br /> irrigation, or 40 ac-ft/yr) <br /> N, = Total nitrogen concentration of irrigation seepage from golf course and vineyard(estimated at 25 <br /> mg/1) <br /> M = Miscellaneous irrigation seepage from pasture, restoration and landscape areas (estimated at 10 <br /> % of applied irrigation, or 15 ac-ft/yr) <br /> NM = Total nitrogen concentration of miscellaneous irrigation seepage (estimated at 10 mg/1) <br /> S = Seepage losses to groundwater from Tracy Lakes (estimated at 100 ac-ft/yr) <br /> N, = Total nitrogen concentration of lake seepage water (estimated at 2.0 mg/1) <br /> R = Groundwater recharge from on-site rainfall infiltration, (estimated at 80 ac-ft/yr) <br /> NR = Total nitrogen concentration of percolating rainfall, (estimated at 1.0 mg/1) <br /> 3. CALCULATIONS: <br /> N� _ (1 - 0.25) (11.2)(40) + (40)(25) + (15)(10) + (100)(2) + (80)(1) <br /> 11.2 + 40 + 15 + 100 + 80 <br /> N� _ (0.75) 448 + 1.000 + 1.500 + 200 + 80 <br /> 246.2 <br /> N� = 5.7 mg/1, as N <br /> N� _ (5.7 mg/1)(4.43) = 25.3 mg/1, as NO3 <br /> 4.6-22 <br />