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20 January 2021 <br />Project No. 20-6284 <br />Page 14 of 14 <br />AdvancedGeo <br />An Employyt^te-Owned Company <br />v/MM <br />,� a <br />9.75 ppm of additional nitrogen is estimated to be added to the site over the long term <br />through wastewater recharge from the proposed septic system. <br />11.0. MITIGATION METHODS PROPOSED <br />To mitigate any known or potential future impacts of nitrate to soil and groundwater from <br />the proposed septic system, the following mitigations could be implemented: <br />• Maximize wastewater hold time where practical (retention). <br />• Avoid use of bioattenuation chemicals (bleach etc.). <br />• Properly and regularly maintain the property septic system. <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 AND RECOMMENDATIONS <br />Based on this Soil Suitability and Nitrate Loading Study, AGI concludes the following: <br />• The percolation rate meets the minimum EHD standards in the proposed septic <br />system disposal field. <br />• The nitrogen loading rate is below the desired value of 10 ppm. <br />• A groundwater sample was not collected from the onsite domestic water well <br />because there currently is no power to the subject property. <br />• All approved septic system use should follow the EHD Onsite Wastewater <br />Treatment System Standards. <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 />were based on field testing results. Evaluations of the hydrogeologic conditions at the site <br />for the purpose of this investigation were made from a limited number of available data <br />points (i.e. test hole and field data) and subsurface conditions may vary away from these <br />data points. No other warranty, expressed or implied, is made as to the professional <br />interpretations, opinions and recommendations contained in this report. <br />