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{ April I3,2000... is Job,. lumber:LG00-114} Page S rt. -.-Table;,Results and Variables Used in the Mass"Balance Analysis (see worksheets in Appendix for calculations) _ J: Result of Denitrifi= Deep Rain Waste,level 4 Rain Acres f' �s Analysis . cat on 5 Percolation` Concentration 5 -� 0.94 m -N 25% 4 7.86 inches 45 mo N- 0.17 m N 25' „ The result of.the nitrate-loading analysis indicates that viewing the combined septic load of 343allons per da g p y(average) effluent at.a concentration of 45.0 mg/l N and-7.96 inches of rain at. ' A concentration of 017-mg/l N'for the 25 acre site for an'average year,the total combined a. $' concentration of mtrates.from these two sources before mixing with-ground-water is estimated to be 0.94 mg/1-N usingma typical denitrificaiton factor of 25%. This concentration is about 9% of the maximum contamtnate,level (MCL)for the.drinking water standard of 10 in N. VIII: CONCLUSIONS AND RECOMMENDATIONS In conclusion 4he percolation test indicated.the onsite,soils percolafe 0.31 minutes per. inch at a depth'of 15'feet The septic.peimit review..has shown that'generally septic systems with �. -leach lines and seepage,pits were used in.the area- .The three (3) eN,ploratory borings did not, encounter.ground water however a localized,moist zone was encountered in 9-1 between the depths..of 10.5 to 11 feet., 'Recent County ground--water depth-maps have shown the depth to k ` ` .ground water.ranged;between approximately 100 feet to 120 feet in 1998-at,the subject site. . The estimated total average yearly nitrate loading-concentration for the property is estimated to f be 0.94 mg/1-N, about 9% of the maximum contaminate level for the,di nking water. This k represents the-combined concentration.of percolating effluent and percolating -ainwater:before !' nixing with ground water. Based ori the "results of this study,we believe-the site is suitable fora new septic system ` and the'propased'project will not negativelyimpact ground water quality.,Provided-our - recommendations are:followed,we do.not believe-that the initial phase or future phase of.the proposed project will:lnegatively impact"ground water quality.,The recommendations for the septic system are as follows s Hantzshe N.N.,.Finnemore,E.J. 1991,Predicating Ground Water Nitrate-Nitrogen Impacts. Ground Water Vol.30,No.4. ;