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27 April 2020 <br />Project No. 20-5084 <br />Page 14 of 15 <br />9.7. IMPACT OF NITROGEN LOADING FROM SITE PROJECT TO <br />DOWNGRADIENT WATER SOURCES <br /> <br />The recharging of groundwater is the most likely potential feature that could impact future <br />nitrogen loading. Since the subject property is flat, AGI does not anticipate percolating <br />effluent will affect any nearby water sources. Based on the volume of wastewater to be <br />generated, the potential vertical migration would not likely degrade the local groundwater. <br />A total of 10.0 ppm of additional nitrogen is estimated to be added to the site over the <br />long term through wastewater recharge from the existing and proposed septic systems. <br />The nitrogen loading value is equal to 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 proposed development should <br />not negatively impact NO3_N loading rates within the aquifer. The soil at the site appe ar <br />to be adequate for nitrate degradation and proper leaching of wastewater. A total of <br />10.0 ppm of additional nitrogen is estimated to be added to the site over the long term <br />through wastewater 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 AND RECOMMENDATIONS <br /> <br />Based on this Soil Suitability and Nitrate Loading Study, AGI concludes the following: <br />