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FFinColunms septic tank effluent concentrations from various researchers that have been published in ecentralized Wastewater Mana ement Systems by Crites and Tchobanoglous are found 3 and 4. These two columns illustrate the effect effluent filtration has on certain of the effluent, particularly BOD and TSS. Column 5 illustrates septic tank effluentns for the constituents listed that have been determined by the U.S.E.P.A. TABLE 6 Analysis of Septic Crites and Crites and U.S.E.P.A. ANALYTE System Effluent Tchobanoglous: Tchobanoglous: Averaged From With Effluent Filter Without Efnuent Filter Three S.J.C. Churches Ammonia Nitrogen(NH,--N) 103 mg/L 40 mg/L 40 mg/L 6-18 mg/L Organic Nitrogen 10 mg/L 28 mg/L 28 mg/L 30-82 mg/L Nitrate BDL BDL BDL BDL Total Nitrogen 113 mg/L 68 mg/L 68 mg/L 35-100 mg/1- Total g/LTotal Suspended Solids 72 mg/L 80 mg/L 30 mg/L (TSS) 200-290 mg/L Biochemical Oxygen 21 mg/L 180 mg/L 130 mg/L 200-290 mg/l. Demand(BOD,) pH 7.7 N/A N/A N/A Total Alkalinity 983 mg/L 60-120 mg/L 60-120 mg/L N/A B. CALCULATED NITRATE-NITROGEN LOADING Qinca calcula d or estimated nitrate-nitrogen impact to the soil and ultimately to the is difficult t determine due to the number of variables involved. These variables 'ability i wastewater flows, nitrogen concentrations and dilution effects that may occur, 2.)Impac previous on-site operations, 3.)Upgradient nitrate sources from agricultural farmland, 4.) Changes in groundwater directional flow and elevation, 5.) Denitrification potential of the underlying soil, and 5.)Rainfall recharge. As noted in Table 6, the Total Nitrogen(TN) content is substantially higher in the tested septic tank /cMuen an in the published sources. Therefore, as a safety factor, a Total Nitrogen concentration of 113 mg/L ill be used in the nitrate loading calculations, below. Various scientific methods are used to esrima nitrate-nitrogen loading. This study uses the Hantzsche/Finnemore Formula to predict the avemle concentration of nitrate-nitrogen in effluent recharge water. 13 Chesney Consulting