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In addition, future agricultural production that may occur on each individual Parcel by the <br /> landowner has also not been taken into consideration since it is unknown at this time. <br /> The following calculations demonstrate that the nitrate loading potential for the project originating <br /> from proposed septic system influence is nil,primarily due to the large land area(455 acres). <br /> Hantzsche/Finnemore Equation <br /> IN(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 <br /> inches per yr. Total wastewater volume: 490 gals/house x 22 houses cN mde aim nme = <br /> 10,800 gpd x 365 days/year=3,942,000 gals+7.47 gals per ft3 = 528,000 cu ft of <br /> wastewater. Does not account for Evapotranspiration. <br /> Nw= Total nitrogen concentration of wastewater at 56 mg N/L based on average of three <br /> effluent samples. Does not account for loss of nitrogen in septic tanks (15%) or through <br /> biomat(10%+). <br /> d = Fraction(%) of nitrate-nitrogen loss due to denitrification in the soil <br /> R = Average recharge rate of rainfall - 9 inches per yr <br /> Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater <br /> influences (ppm NO3-N) <br /> Values and Assumptions <br /> I= 3,942,000 gals=total W W/vr= 528.000 cu ft/3r=0.32 in/yr <br /> 455 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw=56 mg N/L <br /> d = Assume 15% due to a fine-grained silt soil at soil/effluent interface. <br /> R = 9 in/yr. <br /> Nb= Assumed to be 0.1 ppm N0;N <br /> 0.32 in/yr(56 mg N/L) G - 0.15) + (9 in/yr x 0.1 mg/L) <br /> Nr = (0.32 in/yr+ 9 in/yr) <br /> Nr = 1.7 ppm as nitrate-nitrogen (N0;N) or 7.7 ppm as nitrate (NO3) <br /> Nr isfive times under the Maximum Contaminant Level (MCL)for nitrate-nitro en 10ppm). <br /> Page -7- <br /> Chesney Consulting <br />