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Soil Suitability Nitrate Loading Study <br /> Manteca Unified School District <br /> 5700 East Nile Ave.,Manteca,CA <br /> Page 10 <br /> near vicinity and agricultural use in the general region. Due to these factors and assumptions described,the <br /> shallow aquifer beneath the Site is already impaired. <br /> 2.4.2 Methods Proposed to Mitigate Known or Future Impact to Soil and Groundwater from <br /> Nitrate,and/or any Other Constituent of Concern,at and/or Around the Project Site <br /> The Site is located within historical and current rural housing and agricultural farmlands. Activities related <br /> to these practices and the use of existing septic systems are considered potential influences on soil suitability <br /> and nitrate loading results. Historical shallow groundwater elevation may further contribute to past and <br /> future nitrate concentrations. <br /> Typical mitigation measures to minimize potential building up nitrate in the shallow aquifer may include <br /> advanced treatment options to reduce effluent nitrate-N concentrations to below 10 mg/L and/or a designed <br /> groundwater offset that creates a separation of at least five feet between the bottom of the leach trench(es) <br /> and the static groundwater level. <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Although the result of this nitrate loading report and calculation indicates that mitigation measures may be <br /> warranted in areas of unimpacted groundwater, existing impairment of the shallow aquifer suggests that <br /> mitigation may not be warranted. <br /> 3.1 REPORT CERTIFICATION <br /> Our professional services were performed, our findings obtained, and our conclusions proposed in <br /> accordance with generally accepted engineering principles and practices.This warranty is in lieu of all other <br /> warranties either expressed or implied. Test findings and statements of professional opinion do not <br /> constitute a guarantee or warranty, expressed or implied. <br /> The professional findings contained in this nitrate loading study are strictly based on the information <br /> provided regarding the proposed project, other consultant's reports and conclusions, surficial geologic <br /> conditions encountered across the site by others. Furthermore, the analysis, conclusions and <br /> recommendations contained in this report are based on the site conditions as they existed at the time, we <br /> performed our study. <br /> Respectfully submitted, — <br /> �\0;AL GF <br /> CONDOR EARTH P �� <br /> ENVIRONMENTAL PROFESSIONAL: a ASSISTED BY: <br /> No.MS <br /> OF Ca��F�� <br /> John P. Lane,CA PG No. 6795 December 27,2019 Kaleb Ledford <br /> Environmental Services Manager Staff Geologist <br /> X:\Project\7000_prj\7862 MUSD Nile Garden Elementary\7862B - Soil Suit-Nitrate Loading\Reports\FR_20191219_Nile Garden—Soil Suit- <br /> Nitrate.docx <br /> t44 <br /> 1's• <br /> �i�r CONDOR <br />