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Addendum Revised Soil Suitability Nitrate Loading Study <br />Manteca Unified School District <br />241 4th Street, French Camp, CA <br />Page 10 <br /> <br /> <br />accumulates in the shallow groundwater zones. The proposed development is surrounded by agricultural <br />use as well as rural residential to the southwest that relies predominantly on septic use. Elevated nitrates <br />upgradient of the subject property have been documented in the GAMA database. Due to these factors and <br />assumptions described, the result of nitrate exceedance is possible. <br /> <br />2.4.2 Methods Proposed to Mitigate and 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 agricultural farmlands and rural housing. Activities related <br />to these practices and the use of existing septic systems may be considered potential influences on soil <br />suitability and nitrate loading results. <br /> <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 and/or a designed pressure <br />distribution leachfield. <br /> <br />3.0 CONCLUSIONS AND RECOMMENDATIONS SECTION <br />The result of this nitrate loading report indicates that the calculated discharge from the proposed <br />development would not result in nitrate-N concentrations exceeding the 10 mg/L, which suggests that <br />designed mitigation is unwarranted. <br /> <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 /> <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 /> <br />Respectfully submitted, <br />CONDOR EARTH <br /> <br />ENVIRONMENTAL PROFESSIONAL: ASSISTED BY: <br /> <br /> <br /> <br /> <br />John P. Lane, CA PG No. 6795 February 17, 2021 Kaleb Ledford <br />Environmental Services Manager Staff Geologist <br /> <br />X:\Project\7000_prj\7986 MUSD French Camp Elementary School\7986B - Soil Suit-Nitrate Loading\Reports\FRA 20210217 French Camp Soil <br />Suitability Nitrate Loading Report.docx <br />