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23 October 2019 AdvancedGeo <br /> AGE Project No. 19-4881 E n vi ro n m e n t a I <br /> Page 15 of 15 <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 /> 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, AGE concludes the following: <br /> • The percolation rate meets the minimum EHD standards in the proposed septic <br /> system disposal field. However, the nitrogen loading rate is above the desired <br /> value of 10 mg/I. The parcel appears suitable for the use of a standard septic <br /> system, but additional treatment may be needed to reduce nitrate levels. <br /> • All approved septic system use should follow the EHD Onsite Wastewater <br /> Treatment System Standards. <br /> • Nitrates were detected above the State of California Maximum Contaminant Level <br /> in the onsite water well. AGE recommends the well be resampled to confirm the <br /> concentrations. <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 />