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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 = I n,,,0 — d) + R nb <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 waster water, 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 = 535.7 qpd x 0.01344 acre-inch-day = 0.267 inches per year <br /> 27 acres year-gallon <br /> nr = 0.267 • 85 ( 1 — 0.15 ) + 11.7 ( 1.00) = 2.588 mg per L-N <br /> ( 0.267 + 11.7) <br /> MLgcq <br /> PLATE 3 <br /> BAEZ GEOTECHNICAL GROUP <br />