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rT7atalrogen is the summation of ammonia-nitrogen (NH4) and organic nitrogen(proteins, amino acids, enzymes). Since the septic tank is predominately anaerobic, nitrogen cannot exist in its oxidized state as nitrate for any length of time in the septic effluent, and if it does, it is quickly reduced to NO or NOz. If nitrate existed in the tank effluent, this would also be added to ammonium and organic nitrogen to arrive at Total Nitrogen. NLS§ .33 : To quantify the anticipated nitrogen concentration for use in the nitrate loading calculations for this project, effluent sample test results were obtained from three other Places of Worship in San Joaquin County. These analytical test results were averaged to provide the concentrations found in Column 2, in Table 7 below. In addition, septic tank effluent concentrations from various researchers that have been published in Small and Decentralized Wastewater Management S, sty ems,by Crites and Tchobanoglous are found in Columns 3 and 4. These two columns illustrate the effect effluent filtration has on certain constituents of the effluent, particularly BOD and TSS. Column 5 illustrates septic tank effluent concentrations for the constituents listed that have been determined by the U.S.E.P.A. TABLE 7 4Analysis of Septic" Critcs and. Crites and u.5.t✓.P.A. ANALYTE System Effluent; Tchobauoglousc .460anoglous: Averaged From With Effluent Filter Without Effluent 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 (TN) 113 mg/L 66 mg/L 68 mg/L 35-100 mg/L Total Suspended Solids 72 mg/L 80 mg/L 30 mg/L 200-290 mg/L (TSS) Biochemical Oxygen 21 mg/L 180 mg/L 130 mg/L 200-290 mg/L Demand(BODS) pll 7.7 N/A NIA NIA Total Alkalinity 983 mg/L 60-120 mg/L 60-120 mg/L N/A B. CALCULATED NITRATE-NITROGEN LOADING NLS§3.3: The calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the groundwater is difficult to determine due to the number of variables involved. These variables include 1.) Variability in wastewater flows leading to variability in nitrogen concentrations and dilution effects that may occur, 2.) Impact from previous on-site poultry 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. 13 ChesneyConsulting r g