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April 3,2001 Job Number: LGO1-074 Page 10 Table 5. Summary of Mass Balance Analysis. Parcel Result: Percolating Denitrification Deep Rain Waste level to leach Rain Size(ac) Nitrate Factor 7 Percolation 7 field Concentration Concentration* 10.173 19.49 mg/1-N 25% 7.86 inches 45 mg/1-N 8 0.17 mg/1-N Untreated Influent 10.173 8.7 mg/1-N 25% 7.86 inches 20 mg/1-N' 0.17 mg/1-N Orenco System 10.173 4.3 mg/1-N 25% 7.86 inches 10 mg/1-N 9 0.17 mg/1-N MicroSepTec System 10.173 10 mg/1-N* 25% 7.86 inches 23 mg/l-N 0.17 mg/1-N Maximum allowable concentration *Note:Maximum drinking water standard for Nitrate is 10 mg/L-N(45 mg/L as NO3). The result of the analysis has shown that a conventional septic system which relies on nitrogen reduction in the leach field soil would eventually cause a build up of nitrates at the site above the maximum contaminate level for nitrates (10 mg/L-N). However, if a substantial reduction of nitrates were to occur in the septic tank prior to disposal in the leach field, a build up of nitrogen above the maximum contaminate level may not occur. The Orenco Advantex and MicroSepTec System are two products which deliver a significant reduction in nitrogen. Either of these treatment systems or another similar treatment system would need to achieve a nitrate concentration of effluent of 23 mg/L-N or less to prevent a buildup of nitrates in the ground water above the maximum contaminate level of 10 mg/L-N. This level will be reduced further by biological denitrification in the leach field and is taken into account in the nitrate balance. 8 Orenco Systems,conversation with system engineer. AdvanTex system performance achieves a typical reduction of nitrogen to a concentration of about 10 mg/L-N in residential systems. Levels may be higher for a school probably around 20 mg/L-N. 9 Wistrom,A.O.and Matsumoto,M.R., 1999,Evaluation of Microseptec Enviroserver residential waste water treatment system:Prepared for Microseptec Inc.26601 Cabot Road Laguna Hills,CA 92653.Department of Chemical and Environmental Engineering,University of California,Riverside. QERS�L Z O `