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THE CALCULATED MAXIMUM NUMBER OF PEOPLE THE SUBJECT PROPERTY <br /> (APNs 179-160-18, 19, 20 (5.02 Acres) AS A WHOLE,AND AS A COMMERCIAL <br /> DEVELOPMENT CAN SUPPORT= <br /> HANTZSCHEIFINNEMORE EQUATION <br /> INw(l - 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 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=50 people x 15 gals/mrson/d x 260 work d/yr= 1,170.000 gals=total W W/vr= 156.417 cu ft= 1.43 in/yr <br /> 5.02 Ac x 43,560 sq ft/Ac x (I 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 /> 1.43 in/yr(103 mg N/L) G - 0.20) + (11 in/yr x 0.1 mg/L) <br /> Nr = (1.43 in/yr+ 11 in/yr) <br /> Nr = 9.6 ppm as nitrate-nitrogen(NO3 N) or 42.6 ppm as nitrate (NO3) <br /> 50 people for Commercial Use of APN 179-160-18, 19 and 20 (5.02 Acres). Considering if <br /> four houses to the acre were built on these parcels and each house had an average of 3.5 people, <br /> the total number of people on this parcel would be: 3.5 people x 4 houses x 5.02 ac = 70 people. <br /> The nitrate loading calculated for wastewater effluent recharge from the property analyzed is <br /> below the drinking water Maximum Contaminant Level (MCL) of 10 ppm NO3-N or 45 ppm <br /> NO3. The clay soil is projected to have at least a 20% denitrification potential. <br /> Chesney Consulting <br />