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30 August 2019 <br />AGE Project No. 19-4819 <br />Page 14 of 15 <br /> <br />generated, the potential vertical migration would not likely degrade the local groundwater. <br />A total of 17.98 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 above the desired value of 10 ppm. <br /> <br /> <br />10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT <br /> <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 may impact NO3_N loading rates within the aquifer. The soil at the site <br />appear to be adequate for nitrate degradation and proper leaching of wastewater. A total <br />of 17.98 ppm of additional nitrogen is estimated to be added to the site over the long term <br />through waste water recharge from the existing and proposed septic systems. <br /> <br /> <br />11.0. MITIGATION METHODS PROPOSED <br /> <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 /> <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 /> <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 /> <br /> <br />12.0. CONCLUSIONS <br /> <br />Based on this Soil Suitability and Nitrate Loading Study, AGE concludes the following: <br /> <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 /> <br /> <br />13.0. LIMITATIONS <br /> <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