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15 April 2009 <br /> AGE-NC-09-1683 <br /> k Page 16 of 18 <br /> Where, <br /> N, =The average concentration ofnitrate-nitrogen in the recharged wastewater parts per million <br /> of nitrate-nitrogen. <br /> I =Volume rate ofwastewater entering the soil averaged over the gross developed area(acres) <br /> in inches per year. The total wastewater volume for proposed project will be <br /> - 750 tal for multi-purpose room)x 36 days (maximum number of events per year) <br /> —�6UTga <br /> - arehouse)x 260 days (full-time em to s =�qas <br /> - 0 g lloris] <br />{ 37,920 gallons - 7.48 gallons per cubic f = 5,070 cubic feet �ewater. Does not <br /> account for evapotranspiration likely to occ <br /> NW =Total nitrogen concentration of wastewater at 65 mg/L-N based on the average discharge. <br /> Accounting for the loss of mg/L-N in the septic tank at 15%: 65-15%= 55,25-and4e loss <br /> from the biomat at 10%: 55.25 - 10%=49.73 mg/L-N or approxi ately 50 m N <br /> d = Fraction of nitrogen conte tration-removed from the wastewater due to de-nitrification <br /> within the soil (an estimatc of 25 perc nt fro st ty sands was used). <br /> R =Average rainfall rate per ear: 17.28 i es. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, from wastewater <br /> influences. <br /> Assumptions: <br /> w 7'0 <br /> 1-37,920 gallons/year=5,070 cubic feet wastewater/year_(4.5 acres [approximate area of winery <br /> facility using Appendix B] x 43,560 e_et2_ 1 1aches) � 3a �y <br /> 5,070 ft"year-16,33 5<0.31 inches/year - d` � <br /> NW=50_Img/L-N d=25 percent de-nitrification R= 17.28 inches/year <br /> Nb —0.1 mrl igram per liter <br /> N,= 0.31 inches/year(50 mg/L-N) (1-0.25)+17.28 inches/year x 0.1 mg/1= <br /> (0.31 inches/year 17.28 inches/year) <br /> N, 2.89_ 17.59 =0.164 mglL Nr= 0.164 ppm nitrogen(NO3 N) <br /> Nr= 0.722 ppni nitrate (NO3) <br /> Advanced GeoEnvironmental,Inc. <br />