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17 January 2020 AdvancedGeo Project No. 19-4964 An Employee Owned Company Page 14 of 14 ' 11.0. MITIGATION METHODS PROPOSED To mitigate any known or potential future impacts to soil and groundwater of nitrate from the existing and proposed septic systems, the following mitigations could be implemented: • Maximize wastewater hold time where practical (retention). • Avoid use of bioattenuation chemicals (bleach etc.). • Properly and regularly maintain property septic systems. • Use EHD criteria for sizing the septic disposal field. If re-location or expansion of leach fields becomes necessary, leach lines should include high organic substrates under and surrounding the lines installed. 12.0. CONCLUSIONS AND RECOMMENDATIONS Based on this Soil Suitability and Nitrate Loading Study, AGI concludes the following: • The percolation rate meets the minimum EHD standards in the proposed septic system disposal field. However, the nitrogen loading rate is slightly above the desired value of 10 mg/I. The parcel appears suitable for the use of a standard septic system, but additional treatment may be needed to reduce nitrate levels. • All approved septic system use should follow the EHD Onsite Wastewater Treatment System Standards. 13.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based on field testing results. Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation were made from a limited number of available data points (i.e. test hole and field data) and subsurface conditions may vary away from these data points. No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report.