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TABLE 5 <br /> SEPTIC TANK EFFLUENT ANALYSIS <br /> SAMPLE ID NITRATE-NO, TOTAL AMMONIA ORGANIC TOTAL pH <br /> KJELDAHL NITROGEN- NITROGEN ALKALINITY <br /> NITROGEN NH, <br /> (TKN) <br /> Septic Tank BDL 144 mg/L 131 mg/L 13 mg/L 863 mg/L <br /> Non-Detect <br /> B. CALCULATED NITRATE-NITROGEN LOADING <br /> NLS§3.4,3.5,3.6. The calculated nitrate-nitrogen impact to the soil and ultimately to the <br /> groundwater is difficult to determine due to the large number of variables involved and variables <br /> unknown at this time. These include: l.) Nitrate impact from upgradient agricultural sources, 2.) <br /> Variability in wastewater flows, effluent nitrogen concentrations and dilution effects, 3.) Changes <br /> in groundwater directional flow and elevation, 4.) And the denitrification potential of the <br /> indigenous soils. <br /> HANTZSCHEIFINNEMORE EQUATION <br /> INWLL-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 ac-ft <br /> Nw = Total nitrogen concentration of wastewater in mg N/L <br /> d = Fraction (%)of nitrate-nitrogen combined loss in the soil due to denitrification. <br /> R = Estimated Annual Rainfall Recharge in ac-ft as determined on Page 6. <br /> Nb = Background nitrate-nitrogen concentration of rainfall recharge, exclusive of wastewater influences <br /> (ppm NO3-N). <br /> Values and Assumptions: <br /> I= 2.19 ac-ft <br /> Nw= 144 mg N/L <br /> d = Since the subject property was recently under agricultural production,the decrease in nitrate-nitrogen of 10 <br /> ppm at the 6 ft depth to 2 ppm at the 10 ft depth illustrates 80%denitrification of applied nitrogen fertilizers. <br /> R = 12.73 ac-ft <br /> Nb= Assumed to be 0.1 ppm NO3-N <br /> Page -8- <br /> Chesney Consulting <br />