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F <br /> s scientific methods are used to estimate nitrate-nitrogen loading. This study uses the <br /> che/Finnemore Formula to predict the average concentration of nitrate-nitrogen in effluente water. <br /> NLS§3.4,3.5,3.6. PREDICTED NITRATE-NITROGEN LOADING FROM THE ENTIRE SUNSET <br /> KENNELS PROJECT USING THE MAXIMUM AVERAGE DAILY FLOW (ADF)OF 215 GPD <br /> BASED ON THE PARAMETERS DESCRIBED,AND TAKING THE ENTIRE PROJECT AREA OF <br /> 1.25 ACRES INTO CONSIDERATION: <br /> ✓HANTZSCHE/FINNEMORE EpUATION <br /> INW(1 - d) +RNb <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 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 NLS§3.2 <br /> Nb= Background nitrate-nitrogen concentration of rainfall recharge,exclusive of wastewater influences <br /> (ppm NO3-N) <br /> Values and Assumptions <br /> I= 215 gpd x 365 d/yr of operation= 78,475 gals=total WW/vr= 10,491 cu ft = 2.31 in. <br /> 1.25 Ac x 43,560 sq ft/Ac x(1 ft/12 in.) <br /> Nw = 113 mg N/L: 10%reduction from each of two septic tanks(One for the residence/store and one tank <br /> for the kennels) = (1-0.2)113 =90 mg NIL <br /> d = Assume 20%due to the clay content of the native soil and the observed reduction of nitrate-nitrogen content from <br /> the 3 ft to 9 ft depths. <br /> R = 15 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 2.31 in/yr(90 mg N/L) 0 -0.20 +(15 in/yr x 0.1 mg/L) <br /> Nr = (2.31 in/yr+ 15 in/yr) <br /> <= 9.69 ppm a nitrate-nitrogen (NO3 �4314m as nitrate (NO3) <br /> The calculated nitrate loading concentration in the recharge effluent from the entire facility is <br /> calculated to be under the Maximum Contaminant Level limit for nitrate in drinking water,provided <br /> that the ADF is not exceeded. The variables used in the calculations above are very conservative. For <br /> example, the use of 113 mg N/L, which was determined from actual septic tank effluent from three <br /> commercial facilities is a much higher nitrogen concentration than those concentrations published in <br /> the sources referenced in Table 5, and takes into account nitrogen from dog urine. <br /> 10 <br /> Chesney Consulting <br />