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26440,8875,&8925 Thornton Road Project No. 2017-00010 Page 19 <br /> County Maintenance District is planned for the proposed development, however, there are <br /> domestic wells located within the general outlying area. <br /> Based on the methods and assumptions described, in addition to our professional <br /> judgement,geologic setting,and depth to groundwater,we believe the proposed project will <br /> cause a build-up of nitrate in the ground water above 10 mg/L-N over the long term. <br /> 5.2 Methods of Mitigation <br /> Based on the result of the nitrate loading calculation,mitigation measures are warranted. To <br /> mitigate potential buildup of nitrate in the aquifer, an advanced treatment system should be <br /> installed which is capable of reducing nitrate to 10 mg/L-N (or below). An appropriate depth <br /> to groundwater offset should be designed into the meet EHD criteria, which requires a <br /> minimum of five feet of separation between the bottom of the leach trench and the static <br /> ground water table. <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Our office concludes that the proposed project will cause a build-up of nitrates above 10 <br /> mg/L-N in the ground water. <br /> We recommend that the onsite system be designed to incorporate advanced treatment <br /> which reduces nitrate to an acceptable level as required by San Joaquin County <br /> Environmental Health Department. <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,Gait,Ca 95632 <br /> (2091 400 5729 <br /> www.petralogix.com <br />