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NITRATE LOADING CALCULATIONS <br />According to the articles by Hantzsche & Finnemore 1992, "Predicting Ground -Water <br />Nitrate -Nitrogen Impacts" (see Appendix E References) the expression for the resultant <br />average concentration, nr, of nitrate -nitrogen in recharge water is given by: <br />nr = In, (I —d) + Rnb <br />(I+R) <br />I = volume rate of wastewater entering the soil averaged over the gross developed <br />area, in inches per year <br />nW = total nitrogen concentration of wastewater, in milligrams per liter <br />d = fraction of nitrate -nitrogen loss due to denitrification in the soil <br />R = average recharge rate of rainfall, in inches per year <br />nb = background nitrate -nitrogen concentration of rainfall recharge at the water table, <br />exclusive of waste -water influences, in milligrams per liter <br />I = Q / A multiplied by a conversion factor of 0.01344 acre • inch • day <br />year • gallon <br />Using the values presented in Table 3 — Assumptions for Nitrate Loading Calculations, <br />the resulting calculation follows: <br />I = 200.0 qpd x 0.01344 acre -inch -day = 4.716 inches per year <br />0.57 acres year -gallon <br />nr = 4.716 • 35 ( 1 — 0.25 ) + 10.3 ( 1.00) = 8.930 mg per L -N <br />(4.716 + 10.3) <br />MLGcq <br />BAEZ GEOTECHNICAL GROUP <br />PLATE 3 <br />