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1 <br /> 25288 N Cherokee Lane Project No.2018-00018 Page 17 <br /> 1 <br /> 5.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> ' S.1 Total Nitrate Impact <br /> ' Based on the methods and assumptions described,in addition to our professional judgement <br /> and geologic setting,we believe the proposed project is unlikely to cause a build-up of nitrate <br /> in the ground water above the US EPA MCL of 10 mg/L-N over the long term. <br /> ' S.2 Methods of Mitigation <br /> ' Based on the result of the nitrate loading calculation,in conjunction with the geologic setting <br /> and nitrate background concentration level, we don't believe mitigation measures are <br /> warranted at this time. <br /> ' 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> ' Our office concludes that the proposed project will not likely cause a build-up of nitrates <br /> above the US EPA MCL concentration of 10 mg/L-N in the ground water. <br /> Currently, no mitigation measures are recommended. Mitigation measures may be <br /> recommended/required by EHD at further date. To mitigate potential buildup of nitrate in <br /> the aquifer, measures should be utilized which improve retention time and digestion within <br /> the septic and/or improvement of conditions within the leach field, such as utilization of a <br /> filter bed system. <br /> ' If the county requires an engineered septic system, Petralogix can provide these services for <br /> an additional cost at the time of the request. We appreciate the opportunity to provide our <br /> ' nitrate loading study services. <br /> ' 7.0 LIMITATIONS <br /> Our professional services were performed, our findings obtained, and our conclusions <br /> ' proposed in accordance with generally accepted engineering principles and practices. This <br /> warranty is in lieu of all other warranties either expressed or implied. Test findings and <br /> statements of professional opinion do not constitute a guarantee or warranty, expressed or <br /> ' implied. <br /> The professional findings contained in this nitrate loading study are strictly based on the <br /> information provided regarding the proposed project, other consultant's reports and <br /> ' conclusions, surficial geologic conditions encountered across the site by others. <br /> Furthermore, the analysis, conclusions and recommendations contained in this report are <br /> ' based on the site conditions as they existed at the time we performed our study. <br /> Our professional services were performed, our findings obtained, and our professional <br /> ' opinions are in accordance with generally accepted geologic principles and practices. This <br /> Pe[rabgix Engineering,Inc <br /> 26675 Omella Road,Galt,Ca 95632 <br /> 8691-400-5729 <br /> w .Petralogl=m <br /> 1 <br />