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CALCULATED NITRATE-NITROGEN LOADING FROM THE COMBINED FOUR <br /> PARCELS OF A TOTAL OF 9.41 ACRES WITH NO SECOND UNIT DWELLINGS <br /> CONSIDERED: <br /> M(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 loss due to denitrification in the soil <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: Z <br /> I= 1820 8-x 365 d/vr=664,300 gals=total =88 810 c f 2.60 u3/yr', Q <br /> 9.41 x 43,560 sgtt/Ac x (1 1yrY' <br /> Nw=62 mg NAL � }� <br /> d = Assume 30%due to very high percentage of fine-grained clay soil. G c/ <br /> R = 16 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N --- <br /> 2.60 in/ 62 mg N/L 1 -0.30 + 16 in/yr x 0 1 m q—C x 4,3j-46 <br /> Nr = (2.60 in/yr+ 16 in/yr) <br /> Nr = 6.2 ppm as nitrate-nitrogen (NO3-N)or 27.7 ppm as nitrate(NO3) <br /> The next series of Nitrate Loading calculations will take each individual Parcel into consideration along <br /> with adding a second unit dwelling to each Parcel. <br /> i <br /> Page -8- <br /> Chesney Consulting <br />