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3.) Changes in groundwater directional flow and elevation, 4.) And of significant importance is not <br /> only the denitrification potential of the indigenous clays,but equally important is the diminished <br /> nitrification potential within the clay soil environment. The small pore space within the high clay <br /> content soil significantly reduces oxygen content,thus impeding nitrification. <br /> The Hantzsche/Finnemore Formula is used below to predict the average concentration of nitrate- <br /> nitrogen in effluent recharge water from the proposed wastewater management system. The <br /> calculations are based on a total areal loading basis of 5.01 acres, correlated with the annually <br /> projected wastewater flows of 19,968 gpy. These two factors primarily estimate the average <br /> concentration of nitrate-nitrogen in the recharge effluent. This concentration cannot exceed 10 ppm <br /> nitrate-nitrogen(45 ppm as nitrate). <br /> CALCULATED NITRATE-NITROGEN LOADING FROM THE ON-SITE RESTROOM <br /> TAKING THE ENTIRE SUBJECT PARCEL AREA INTO CONSIDERATION: <br /> HANTZSCHEIFINNEMORE EQUATION <br /> INµ,(1 - d +RNb <br /> Nr= (I+R) <br /> Where: <br /> Nr = Resultant average concentration of nitrate-nitrogen in recharge water-(ppm NO3-N) <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area in inches per yr <br /> Nw = Total nitrogen concentration of wastewater in mg N/L <br /> d = Fraction(%) of nitrate-nitrogen combined loss in the high clay content soil due to: <br /> 1.) Prevention of nitrification and 2.)The denitrification of nit to molecules that may form. <br /> R = Average recharge rate of rainfall- inches per yr NLS§3.2 ✓ <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br /> (ppm NO3-N). <br /> Values and Assumptions: <br /> I=_1_9,968 gals=total WW/Yr=2,670 cu ft =0.15 in/yr <br /> 5.01 Ac x 43,560 sq ft/Ac x(1 ft/12 in) <br /> Nw= 62 mg N/L <br /> d = Assume 25%due to the high percentage of clay soil(32%)throughout the soil profile that not only <br /> retards nitrification,but also promotes denitrification of nitrate molecules that may form. <br /> R = 9.5 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3 N <br /> 0.15 in/y(62 mg N/L) (1 -0.25)+(9.5 in/yr x 0.1 mg/L) <br /> Nr (0. in/yr+9.5 in/yr) <br /> Nr 0.81 p as nitrate-nitrogen(N0;N) <br /> Page -7- <br />