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HANTZSCHE/FINNEMORE E UA TION <br /> INW I - d +R Nb <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 <br /> inches per yr <br /> t 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= 21 people x 15 a Is/person/d x 260 work d/ r=81 900 gals=totalWW/ r= 10 949 cu ft= 1.51 in/yr <br /> 2.00 Ac x 43,560 sq ft/Ac x (I ft/12 in) <br /> Nw= 103 mg NIL: 20% reduction from effluent filter+ 10%removal from biomat= 74 mg N/L <br /> d = Assume 35% due to high clay content soil <br /> R = 11 in/yr. But 50% of total area covered w/roofs and asphalt 6 in/yr. <br /> Nb = Assumed to be 0.1 ppm NO3-N <br /> 1.51 in/ r 74 m NIL (1 - 0.35) +Q in/vr x. 0.1 m /g_L) <br /> Nr = (1.51 in/yr+ 6 in/yr) <br /> Nr = 0.8 ppm as nitrate-nitrogen (NO3-N) or 43.4 ppm as nitrate (NO3) <br /> .21 people - 13% = 18 people for Parcel 1 <br /> PREDICTED NITRATE-NITROGEN LOADING FROM A COMPLETELY BUILT- <br /> OUT PROJECT USING CONVENTIONAL SEPTIC SYSTEMS WITH THE <br /> MAXIMUM NUMBER OF PEOPLE ON PARCEL 2: <br /> HANTZSCHE/FINNEMORE E UATIDN <br /> IN,, 1 - d +R Nb <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 <br /> inches per yr , <br /> Nw= Total nitrogen concentration of wastewater in mg NIL <br /> d = Fraction (%) of nitrate-nitrogen loss due to denitrification in the soil <br /> 7 <br /> `vafley Ag Research <br />