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F <br /> in Table 7, the Total Nitrogen(TN) content is substantially higher in the tested septic tank <br /> than in the published sources. Therefore, as a safety factor, a Total Nitrogen concentration of <br /> gL will be used in the nitrate loading calculations,below. Various scientific methods are used <br /> to estimate nitrate-nitrogen loading. This study uses the Hantzsche/Finnemore Formula to predict the <br /> average concentration of nitrate-nitrogen in effluent recharge water. <br /> NLS§3.4,3.5,3.6. PREDICTEDO(GPD) <br /> OBAS <br /> OGEN LOADING FROM THE PROPOSED <br /> GURUDWARA SAHIB TRACY FNG THE MAXIMUM AVERAGE DAILY FLOW <br /> (ADF)OF 193 GALLONS PER DA ON THE PARAMETERS DESCRIBED,AND <br /> TAKING THE ENTIRE PROJECACRES INTO CONSIDERATION: <br /> HANTZSCHEIFINNEMORE EQ UA TION <br /> INW(1 - d) +RN6 <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 NIL <br /> d = Fraction(%)of nitrate-nitrogen loss due to denitrification in the sgil' <br /> R = Average recharge rate of rainfall -inches per yr NLS§3.2 7 <br /> Nb= Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br /> (ppm NO3-N) <br /> Values and Assumptions <br /> I= 193 apd x 365 d/vr=70,445 gals=total WW/yr=9,418 cu ft = 1.13 in. <br /> 2.29 Ac x 43,560 sq ft/Ac x(1 ft/12 in.) <br /> Nw = 113 mg N/L: 20%N reduction occurring in the septic tank and 10%in biomat=(1-0.3)113 =79 mg N/L <br /> d = Assume 25%due to the clay loam nature of the native soil and therefore medium-high denitrification potential <br /> R = 9.25 in/yr. <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> 1.13 in/yr(79 mg N/L) (1 - .25) +(9.25 in/Yr_x 0.1 mg/L) <br /> Nr = (1.13 in/yr+9.25 in/yr) <br /> Nr 6.5 p m as nitrate-nitrogen(NO3-N) r 29 p m as nitrate(NO3) <br /> The calculated nitrate loading concentration in the recharge effluent from Phase I of the Gurudwara Sahib is <br /> fcalculated to be 65% of the Maximum Contaminant Level limit for nitrate in drinking water. <br /> 14 <br /> Chesney Consulting <br />