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Now November 18, 1999 Job Number: S99307 Page 8 In our approach to estimate the nitrate concentration, we used the following information for our calculation. Fifteen gallons per day per employee and ten gallons per day per customer was selected as the usage for the proposed recreational vehicle center_ Table of Total Estimated Daily Usage (see worksheets in Appendix for calculations) Category Effluent usage for People Per Day Daily effluent quantity per category each category Employees 15 gals 3 45 gals/day Customers 10 gals 4 40 gals/day Total: 85gals/dal total effluent Table of Results and Variables Used in the Mass Balance Analysis (see worksheets in Appendix for calculations) Result of Denitrifi- Deep Rain Waste level' Rain Acres Analysis cation` Percolation` Concentration` 5.78 m -N 25% 7.86 inches 52.9 in N 0.17 210 N 1.0 The results of the analysis indicates that viewing the septic and rain loads for the 1.0 acre site for an average year, the combined rain water and treated septic eluent concentration of _ nitrates is estimated to be 5.78 mg/1-N, about 58% of the maximum contaminate level for the drinking water standard of 10 mg/1-N. VIII. CONCLUSIONS AND RECOMMENDATIONS In conclusion, analysis of both percolation tests results indicates the onsite soils percolate 30 min/in at a depth of 2 feet and 15 min/in at a depth of 10 feet. The septic permit review has shown that generally the leach-field/seepage-pit septic design is common for the soils in the area. The 10 foot exploratory boring encountered no shallow groundwater and onsite wells have shown the depth to groundwater is about 75 feet- 6 Hantzshe N.N.,Finnemore,E.J_ 1991, Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground Water Vol. 30,No. 4. pERJOy Z • O ` 1JJGG\ r