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21 June 2019 AdvancedGeo AGE Project No. 19-4745 Environmental Page 13 of 14 Nr = [0.26 inches/year x 65.025 mg/L-N (1-0.20)] + (17.63 inches/year x 0.1 milligram per liter) _ (0.13 inches/year + 17.63 inches/year) Nr = 8.923 = 17.89 = 0.49 Nr = 0.86 ppm nitrogen (NO3_N) 9.7. IMPACT OF NITROGEN LOADING FROM SITE PROJECT The recharging of groundwater is the most likely potential feature that could impact future nitrogen loading. However, the potential vertical migration of the wastewater would be lesser with the current septic design. Based on the low volume of wastewater to be generated and significant groundwater, the potential vertical migration would not likely degrade the local groundwater. A total of 0.86 parts per million (ppm) from the restroom (toilet and sink) of additional nitrogen is added to the site through waste water recharge from the new modular office. 10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT Based on the assumptions of the report, proposed NO3_N mass of wastewater and the calculations of the NO3_N loading predicted, the proposed development should not negatively impact NO3_N loading rates within the aquifer. The soil at the site appear to be adequate for nitrate degradation and proper leaching of wastewater. 11.0. MITIGATION METHODS PROPOSED To mitigate any known or potential future impacts to soil and groundwater from nitrate from the new office building and increased septic usage, the following mitigations could be implemented: • Maximize wastewater hold time where practical; • Avoid use of bioattenuation chemicals (bleach etc.); • Properly and regularly maintain property septic systems; If re-location or expansion of leach fields becomes necessary, leach lines should include high organic substrates under and surrounding the lines installed. However, AGE does not anticipate that any mitigation measures will be necessary. 12.0. CONCLUSIONS Based on this Soil Suitability and Nitrate Loading Study, AGE concludes the following: