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. <br /> April 13 2000. !4 ' <br /> `• Job.Nuinber. LG00-1141 <br /> '(' Page 8 t ' <br /> Table. Results and Variabies`Used in the Mass Balance Analysis , <br /> (see worksheets in Appendix for calculations) <br /> Result of Denrtnfi- Deep Rain; Waste level4 Rain . Acres <br /> �i Analysis cation° . ' Percolation` Concentration s <br /> v 0.94 N7.86 inches .45 m N ' 0.17 m N 25''_ <br /> The result of the i»trate.loading analysis indicates that viewing the combined septic load of <br /> 343 gallons per day'(i�Fverage) effluent'at.a concentration of 45.0 mg/1N and 7.86 inches of rain at. . <br /> a concentration of 0.17 mg/1 N for the 25 acre site foran average year,the total combined <br /> concentration of nitrates.from these two sources before mixing with'ground•water is estimated to . <br /> 'be 0.94 mg/1-N usmg�a typical denitnficaiton factor of 25%. This ooneentration is about 9% of <br /> the maximum contaniinate,level(MCL)for the dnnlang water standard of 10 mg/l N. <br /> Y VIIC CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusioA:the percolation test indkitted.the onsite soils percolate 0.31 minutes per. ' <br /> inch at a depth of 15 t'eet.The septic permit review.has shown that'gerierally septic systems with <br /> �.' leach lines and seepage pits were used in the area The three(3) exploratory borings did not, <br /> encounter.ground water however a:localized-moist zone was encountered m B-1 between the <br /> depths.of•10.5 to 11 feet. -Recent County ground-water.depth maps have shown the depth to <br /> '-z'ground,water ranged,!e"e'en approximately 100 feet to 120 feet in_1998 at the subject site. <br /> The estimated total average yearly nitrate loading.concentration for theproperty is estimated to <br /> be 0.94 mg/1-N, about 9% of the maximum contaminate level for the•diinking water. This <br /> represents the combined concentration.of percolating effluent and percolating"rainwateubdfore <br /> mixing with ground water:'. <br /> Based on the fesults of this study,we believe the site is suitable fora new septic system <br /> and thepropose'd project will not negatively,impact ground water'quality..Provided-our <br /> recommendations are,%ilowe.d;we.do not believe that the initial phase or future phase of the <br /> proposed protect williinegatively impact.gi'ound water quality. The recommendations for the septic <br /> system areas follows <br /> r12 <br /> It <br /> n. <br /> s'Hantrshe N.N .Futrai re E J 1991 Predicating Ground Water Nitrate Nitmgen Impacts. Ground : <br /> Water V61.30,No 4 <br /> ti <br /> i <br />