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the County's factor of safety. The site is expected to grow in phases, but the additions to the <br /> existing site have no significant impact on the 4.5-acre site. <br /> The average total nitrogen concentration of domestic wastewater is about 20-85 mg/L-N, <br /> although 35-45 mg/L-N is a better approximation(Crites and Tchnobanglous). The value <br /> selected for this site was 40 mg/L-N assuming this site shall experience a larger concentration. <br /> The site will experience a process of denitrification as the soil naturally treats surface material <br /> through natural forms. Denitrification is a process that occurs when bacteria uses oxygen in the <br /> nitrate(NO3) and release nitrogen(N2)into the atmosphere. Denitrification can be variable to the <br /> type of soils, chemical properties, moisture content and other variables. Based on the clay on site <br /> and the percolation rate, this site's soil has moderate levels of denitrification. It is expected that a <br /> site with soil of these characteristics shall have approximately about 10-15% of denitrification. <br /> The value used for this site was 10%. <br /> 5.5 Calculate mass balance of nitrogen loading considering all potential sources identified <br /> using Hantzsche/Finnemore equation: <br /> Using the data mentioned within this report and the attached Soil Suitability Report the mass <br /> balance of nitrogen loading for this site was calculated,this was done using Hantzsche/Finnemore <br /> formula. Based on the Hantzsche/Finnemore equation this 4.5-acre site would contain a Nitrate <br /> Load(Nc)of 4.38 mg/L-N when the site is generating flow two times larger than what is expected. <br /> 6.0 Discussion of nitrate loading results relative to proposed method of <br /> wastewater disposal. <br /> 6.1 Discussion of total nitrate impact from proposed project: There are slight possibilities that <br /> the percolating effluent could affect water conditions. The Hantzsche/Finnemore equation added <br /> to the County's factor of safety of two account for those risks, but no major additions should be <br /> made beyond the proposed improvements mentioned previously without an update to this report. <br /> 6.2 Description of the methods proposed to mitigate any known or future impact to soil and <br /> groundwater from nitrate and/or other constituents of concern,at and/or around the project <br /> site: The project, as described in this report is sustainable by the site in current conditions. <br /> Additions or modifications to the site may require the addition of a waste water treatment system. <br /> At the time an addition is proposed, this report should be updated to ensure the adequate <br /> improvements are made. <br /> 7.0 CONCLUSION AND RECOMMENDATIONS SECTION <br /> The conclusions of this report are based on the information provided regarding the proposed <br /> development,the use of the subject property, and the site conditions as they existed at the time,we <br /> 4 <br />