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r�� <br /> Calculated nitrate-nitrogen loading: <br /> RLO -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 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 /> N, = Background nitrate-nitrogen concentration of rainfall recharge,exclusive of wastewater influences <br /> Values and Assumptions: <br /> I = 350 s,lpd x 365 d/yr= 127,750 gals=total WW/yr= 17,079 cu ft =3.36 in/yr <br /> 1.4 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw=36 mg N/L as determined above. <br /> d = 30%used in equation,90%quantitatively analyzed. <br /> R = 8.67 in/yr from Table 3. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 3.36 inbi(36 mg N/L) Q -0.30)+(8.67 in/yr x 0.1 mg/L) <br /> Nr = (3.36 in/yr+8.67 in/yr) <br /> Nr = 7.1 ppm as nitrate-nitrogen (NO3 N)or 31.6 ppm as nitrate (NO3) <br /> EFFLUENT DISPOSAL OPERATIONAL PARAMETERS <br /> Either leachline trenches or a filter bed disposal structure may be installed to serve the modular <br /> home, as illustrated on the attached site plans. Required lineal ft of leachline (LFLL)=240 ft. <br /> Three - 80 ft leachlines may be installed, or a 240 LFLL x 3 (Soil Factor)= 720 ft' of filter bed <br /> area, which could be 27'x 27' square. Although a 1,200 gallon septic tank is required, a 1,600 <br /> gallon tank is specified to be installed for additional nitrogen impact mitigation. The 100% <br /> replacement area is also denoted on the Site Plans. <br /> Page -7- <br /> Chesney Consulting <br />