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05 November 2014 <br /> AGE Project No. 14-3119 <br /> Page 14 of 17 <br /> NW Residential = Total nitrogen concentration of wastewater at 45 mg/L-N based on the <br /> average discharge. <br /> d = Fraction of nitrogen concentration removed from the wastewater due to denitrification <br /> within the soil (20 to 25 percent for clay type soils). <br /> R = Average rainfall rate per year: 13 inches. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, from wastewater <br /> influences. <br /> COMMERICAL <br /> The Hantzsche / Finnemore (Nr) equation for commercial application: <br /> Nr = IxNw (1-d)+ RxNb = (I+R) <br /> Nr= The average concentration of nitrate-nitrogen in the recharged waste water parts per <br /> million of nitrate-nitrogen. <br /> I = Volume rate of wastewater entering the soil averaged over the gross developed area <br /> (acres) in inches per year. <br /> • The restroom wastewater volume for proposed project will be 510 gpd x 104 of <br /> 365 days of proposed operation (0.28 [28%] operation over 365 days a year) _ <br /> 365 days X 510 gallons = 186,150 gallons X 0.28 = 52,122 gallons on an annual <br /> basis. <br /> Volumes of wastewater are expressed as 52,122 gallons _ 7.48 gallons per cubic foot = <br /> 6,968 cubic feet of restroom wastewater and 102,960 gallons = 7.48 gallons per cubic <br /> foot = 13,764 cubic feet of restroom wastewater. Does not account for evapotranspiration <br /> likely to occur. <br /> NWrestrooms = Total nitrogen concentration of wastewater at 85 mg/L-N based on the <br /> average discharge. <br /> d = Fraction of nitrogen concentration removed from the wastewater due to denitrification <br /> within the soil (20 percent for clay type soils). <br /> R = Average rainfall rate per year: 13 inches. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, from wastewater <br /> influences. <br /> Advanced GeoEnvironmental,Inc. <br />