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1 <br /> 1 KLE/NFELOER <br /> Bright People.Right Solus-,. <br /> 6 CONCLUSIONS <br /> 6.1 GENERAL <br /> Based on our findings, it is our professional opinion that the site should be suitable for the <br /> proposed septic system provided the conclusions presented in this report are accounted for in the <br /> project design and construction. <br /> 6.2 PERCOLATION TESTING <br /> The results of our percolation tests are presented below. Copies of the field percolation test <br /> results are presented on Figure 6. <br /> Test Soil Description Test Hole Percolation Rate SJCEHD Observed <br /> Number Depth ft. min./inch <br /> PT-1 Silty Sand 5.1 6.76 Yes <br /> PT-2 Silty Sand 7.2 6.58 Yes <br /> 6.3 NITRATE LOADING AND CALCULATIONS <br /> Per SJCEHD requirements, the following summarizes our nitrate loading calculations for the <br /> proposed leach field. The state drinking water standard for nitrate is 45 mg/I (NO3) and 10 mg/I <br /> as Nitrogen (N) in groundwater. In our evaluation of nitrate loading, we have used the Hantzsche <br /> mass balance equation (source: Predicting Groundwater Nitrate-Nitrogen Impacts, Hantzsche <br /> and Finnemore (1992)), which is presented below. It should be noted that the evaluation below <br /> only evaluates the loading of the 16.95 acre parcel which the septic system is proposed to be <br /> located on. <br /> Nc _ I(Nw)(1-D) + R(Nb) <br /> (I+R) <br /> The selection of parameters used in the equation was based on previous studies and <br /> investigations performed by our firm and others, San Joaquin County Sewage Standards, and <br /> information provided in a report dated March 19, 1997 prepared by the Questa Engineering <br /> Corporation and authored by Mr. Hantzsche for a development in the Stockton area. <br /> 20200144.002A/ST019R101556 Page 9 of 14 September 24, 2019 <br /> ©2019 Kleinfelder www.kleinfelder.com <br />