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WASTEWATER CHARACTERISTICS <br /> NLS <br /> 3.3. To quantify the anticipated nitrogen concentration for use in the nitrate loading <br /> calculations from the entire Sunset Pet Kennels facility, effluent sample test results were obtained <br /> from other commercial facilities within San Joaquin County. These analytical test results (three <br /> total tests)were averaged to provide the concentrations found in Column 2, in Table 5 below. In <br /> addition, septic tank effluent concentrations from various researchers that have been published in <br /> Small and Decentralized Wastewater Management Systems,by Crites and Tchobanoglous are <br /> found in Columns 3 and 4. These two columns illustrate the effect effluent filtration has on certain <br /> constituents of the effluent, particularly BOD and TSS. Column 5 illustrates septic tank effluent <br /> concentrations for the constituents listed that have been determined by the U.S.E.P.A. <br /> TABLE 5 <br /> Laboratory Crites and Crites and U.S.E.P.A. <br /> ANALYTE Analysis of Tchobanoglous: Tchobanoglous: <br /> Commercial Septic With Effluent Filter Without Effluent Filter <br /> System Effluent <br /> Ammonia Nitrogen(NH4- 103 mg/L 40 mg/1, 40 mg/L 6-18 mg/L <br /> N) <br /> Organic Nitrogen 10 mg/L 28 mg/L 28 mg/L 30-82 mg/L <br /> Nitrate BDL BDL BDL BDL <br /> Total Nitrogen 113 mg/L 68 mg/L 68 mg/L 35-100 mg/L <br /> Total Suspended Solids 72 mg/L 80 mg/L 30 mg/L 200-290 mg/L <br /> (TSS) <br /> Biochemical Oxygen 21 mg/L 180 mg/L 130 mg/L 200-290 mg/L <br /> Demand(BOD,) <br /> pH 7.7 N/A N/A N/A <br /> Total Alkalinity 983 mg/L 60-120 mg/L 60-120 mg/L N/A <br /> B. CALCULATED NITRATE-NITROGEN LOADING <br /> NLS§ 3.3. The calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the <br /> groundwater is difficult to determine due to the number of variables involved. These variables <br /> include 1.) Variability in wastewater flows, nitrogen concentrations and dilution effects that may <br /> occur, 2.) Impact from previous on-site operations, 3.) Upgradient nitrate sources from agricultural <br /> farmland, 4.) Changes in groundwater directional flow and elevation, 5.) Denitrification potential of <br /> the underlying soil, and 5.) Rainfall recharge. <br /> As noted in Table 5, the Total Nitrogen (TN) content is substantially higher ined septic-tank <br /> effluent than in the published sources. Therefore, a Total Nitrogen concentratip of 113 mg/I,will be <br /> used in the nitrate loading calculations below. <br /> 9 <br /> Chesney Consulting <br />