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Calculated nitrate-nitrogen loading from the residential structure exclusively: <br /> INw LL- dl +R Nb <br /> Nr= (I+R) <br /> Where: <br /> Nr = Resultant average concentration of nitrate-nitrogen in recharge water-(ppm NO3-N) <br /> 1 = 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: <br /> 1=75.000 gals=total WW/yr= 10,027 cu it =0.47 in/yr <br /> 5.90 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw=62 mg N/L <br /> d = Assume 10%due to low percentage of fine-grained clay soil in upper soil profile, but will be <br /> mitigated by the use of peat material within the floor of the filter bed- See Conclusions Section. <br /> R = 11 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3 N <br /> 0.47 in/yr(62 mg N/L) (1 -0.10)+01 in/yr x 0.1 mg/L) <br /> Nr = (0.47 in/yr+ 11 in/yr) <br /> Nr = 2.4 ppm as nitrate-nitrogen (NO3-N) or 10.6 ppm as nitrate(NO,) <br /> Calculated nitrate-nitrogen loading from the proposed commercial coach exclusively: <br /> 1 =30,000 gals=total W W/vr=4.011 cu ft =0.19 in/yr <br /> 5.90 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> 0.19 in/vr(62 mg N/L) (1 - 0.10)+(11 in/yr x 0.1 m L) <br /> Nr = (0.19 in/yr+ 11 in/yr) <br /> Nr =(i.05 ppm as nitrate-nitrogen(NO3-N)or 4.7 ppm as nitrate(NO3) <br /> Therefore, total nitrate-nitrogen contribution from the property= 2.4 + 1.05 = 3.45 or approximately <br /> one-third of the MCL. <br /> 8 <br />