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F <br /> ICTED NITRATE-NITROGEN LOADING FROM A COMPLETELY BUILT- <br /> PROJECT USING AN E.H.D. APPROVED SEPTIC SYSTEM. THE <br /> MUM NUMBER OF PEOPLE APN 190-230-08 (34.74 Acres) CAN SUPPORTZSCHEIFINNEMORE EQUATION <br /> Z!,,,(1 - d)+RN <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 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 /> 1=300 people x 15 gals/person/d x 260 work d/yr= 1.170,000 gals=total WW/yr= 156,417 cu ft= 1.24 in/yr <br /> 34.74 Ac x 43,560 sq ft/Ac x (1 ft/12 in) <br /> Nw= 103 mg N/L <br /> d = Assume 20%due to a fine-grained soil <br /> R = 11 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 1.24 in/yr(103 mg N/L) (1 - 0.20 + (2 11 in/yr x 0.1 mg/L) <br /> Nr = (1.24 in/yr+ 11 in/yr) <br /> Nr = 9 ppm as nitrate-nitrogen(NO3-N) or 40.0 ppm as nitrate (NO3) <br /> 300 people for Industrial Use of APN 190-230-08 (34.74 Acres). Considering if five houses to <br /> the acre were built on this parcel and each house had an average of 3.5 people, the total number of <br /> people on this parcel would be: 3.5 people x 5 houses x 34.74 ac=608 people. <br /> i40— <br /> sot mss . <br /> 10 �jj <br /> Chesney Consulting <br />