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TABLE 4 Laboratory Crites and Crites and U.S.E.P.A. ANALYTE Analysis of Tchobanoglous: Tchobanoglous: Commercial Septic With Effluent Filter Without Effluent Filter System Effluent 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/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) 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 i LS§ 3.3. The calculated or estimated nitrate-nitrogen impact to the soil and ultimately to the oundwater is difficult to determine due to the number of variables involved. These variables include 1.)Variability in wastewater flows, nitrogen concentrations and dilution effects that may occur, 2.) Impact from 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, which appears to be minimal, and 5.) Rainfall recharge. As noted in Table 4, the Total Nitrogen(TN) content is substantially higher in the eptic tank effluent than in the published sources. Therefore, a Total Nitrogen concentration def 113 g/L will be used in the nitrate loading calculations,below. Various scientific methods are used, o timate nitrate-nitrogen loading. This study uses the Hantzsche/Finnemore Formula to predict the average concentra n of nitrate-nitrogen in effluent recharge water. NL§§3.4,3.5,3.6. , PREDICTED NITRATE-NITROGEN LOADING FROM THE PROPOSED PROJECT USING THE MAXIMUM AVERAGE DAILY FLOW (ADF) BASED ON THE PARANWTERS DESCRIBED,AND TAKING THE ENTIRE PROJECT AREA OF 9.45 ACRES INTO CONSIDERATION: HANTZSCHEIFINNEMORE EQUATION INW(1 - d) +R Nb Nr= (I+R) Where: 11 Chesney Consulting