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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 nitrate 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= 166,400 gals=total WW/yr=22,246 cu ft =0.6131 in/yr <br /> 10 Ac x 43,560 sq ft/Ac x(I ft/12 in) <br /> Nw= 146 mg N/L <br /> d = At least 30%as referenced above,due to the high percentage of clay soil(-37%)that not only mitigates <br /> 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 /> 0.6131 in/yr(146 mg N/L) 0 -0.30)+(9.5 in/yr x 0.1 mg/L) <br /> Nr = (0.6131 in/yr+9.5 in/yr) <br /> Nr = 6.29 ppm as nitrate-nitrogen(NO3-N),or 28 ppm as nitrate. <br /> IV. SEPTIC SYSTEM OPERATIONAL PARAMETERS AND COMPONENTS <br /> The plan set,the operational parameters and the operational components of the wastewater treatment <br /> and disposal system for this project will be provided by the engineer-of-record,Mr. Paul Schneider, PE, <br /> V.P. of Siegfried Engineering, Inc. <br /> Page -8- <br /> Chesney Consulting <br />