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18340 E Rodeo Drive Project No.2018-00037 Page 18 <br /> 5.0 DISCUSSION OF NITRATE LOADING RESULTS <br /> 5.1 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 EPA maximum contaminant level concentration of 10.0 mg/L-N <br /> over the long-term. <br /> 5.2 Methods of Mitigation <br /> Based on the result of the nitrate loading calculation,in conjunction with the geologic setting, <br /> we don't believe mitigation measures are 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 EPA maximum contaminant level concentration of 10.0 mg/L-N in the ground <br /> 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 /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt Ca 95632 <br /> (209}400-5729 <br /> www.petraiogix.com <br />