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30 August 2019 AdvancedGeo <br /> AGE Project No. 19-4819 Environmental <br /> Page 14 of 15 <br /> A total of 9.76 parts per million (ppm) of additional nitrogen is estimated to be added to <br /> the site over the long term through waste water recharge from the existing and proposed <br /> septic systems. The nitrogen loading value is below the desired value of 10 ppm. <br /> 10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT <br /> Based on the method and assumptions described, proposed NO3_N mass of wastewater <br /> and the calculations of the NO3_N loading predicted, the existing and proposed <br /> development should not negatively impact NO3_N loading rates within the aquifer. The <br /> soil at the site appear to be adequate for nitrate degradation and proper leaching of <br /> wastewater. A total of 9.76 ppm of additional nitrogen is estimated to be added to the site <br /> over the long term through waste water recharge from the existing and proposed septic <br /> systems. <br /> 11.0. MITIGATION METHODS PROPOSED <br /> To mitigate any known or potential future impacts to soil and groundwater of nitrate from <br /> the existing and proposed septic systems, the following mitigations could be <br /> implemented: <br /> • Maximize wastewater hold time where practical (retention). <br /> • Avoid use of bioattenuation chemicals (bleach etc.). <br /> • Properly and regularly maintain property septic systems. <br /> • Use EHD criteria for sizing the septic disposal field. <br /> If re-location or expansion of leach fields becomes necessary, leach lines should include <br /> high organic substrates under and surrounding the lines installed. <br /> 12.0. CONCLUSIONS <br /> Based on this Soil Suitability and Nitrate Loading Study, AGE concludes the following: <br /> • All approved septic system use should follow the EHD On-Site Waste Disposal <br /> Standards. <br /> • The proposed site development is appropriate with the use of the current potable <br /> water supply and existing septic system. <br /> 13.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. The findings <br />