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F <br /> LATED MAXIMUM NUMBER OF PEOPLE APN 179-160-18 20 (4.0 Acres) <br /> ERCIAL DEVELOPMENT CAN SUPPORTIFINNEMORE EQUATION <br /> INw(1 - d)+RNb <br /> Nr= (I+ R) <br /> Where: <br /> Nr= Resultant average concentration of nitrate-nitrogen in recharge water- (ppm NO,-N) <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area in <br /> inches per yr <br /> Nw= Total nitrogen concentration of wastewater in mg N/L <br /> d = Fraction (%) of nitrate-nitrogen loss due to denitrification in the soil <br /> R = Average recharge rate of rainfall - 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=40 people x 15 gals/person/d x 260 work d/vr= 1.170.000 gals=total W W/vr= 156,417 cu ft= 1.44 in/yr <br /> 4.0 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw= 103 mg N/L <br /> d = Assume 20% due to a fine-grained soil <br /> R = 11 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 1.44 in/w(103 ms N/L) (1 - 0.20) +(11 in/yr x 0.1 mgU <br /> 7Commereial <br /> 1.44 in/yr+ 11 in/yr) <br /> m as nitrate-nitrogen(N0;N) or 42.6 ppm as nitrate (NO3) <br /> Commercial Use of APN 179-160 (4.0 Acres), exclusively. <br /> ading calculated for wastewater effluent recharge from the property analyzed is <br /> nking water Maximum Contaminant Level (MCL) of 10 ppm NO3-N or 45 ppm <br /> y soil is projected to have at least a 20%denitrification potential. <br /> Chesney Consulting <br />