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Nitrate Loading Study Irerracon <br /> Flag City#4 ■ Lodi, California <br /> September 20, 2018 ■Terracon Project No. NA187043 <br /> 4.0 DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO PROPOSED <br /> METHOD OF WASTEWATER DISPOSAL <br /> 4.1 Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading balance <br /> indicates that the development on the parcel should not cause a buildup of nitrates in the aquifer <br /> above 10 mg/L-N. <br /> 4.2 Methods of Mitigation <br /> Because of the favorable result of the nitrate loading calculation, no mitigation measures are <br /> warranted. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions at the site are anticipated to consist of moderately rapid permeable <br /> sandy loam underlain by a very low permeable hardpan. Depth to groundwater is anticipated <br /> between 14 and 40 feet bgs. Groundwater samples collected from the onsite well reported below <br /> laboratory detection limits for nitrate as N and DBCP. Based on the method and assumptions <br /> described, the results of the nitrate loading balance indicated that the proposed development at <br /> the site should not cause a buildup of nitrates in the aquifer above 10 mg/L-N; therefore, mitigation <br /> measures are unwarranted at this time. <br /> 6.0 LIMITATIONS <br /> As indicated, our study takes into account the subject property only with the sewage load applied <br /> over the property site area. The study does not take into account surrounding properties and/or <br /> lands. The method utilized for the nitrate loading analysis is based on a simple mass balance <br /> formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a <br /> convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- <br /> wide basis. A more detailed analysis was not requested nor intended. <br /> Our professional services were performed, our findings obtained, and our conclusions proposed <br /> in accordance with generally accepted engineering principles and practices. This warranty is in <br /> lieu of all other warranties either expressed or implied. Test findings and statements of <br /> professional opinion do not constitute a guarantee or warranty, expressed or implied. <br /> Responsive ■ Resourceful ■ Reliable 9 <br />