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r� <br /> KL E/NFEL DER <br /> Bnghf People Fight Solutions. <br /> 4 CONCLUSIONS <br /> 4.1 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 /> 4.2 PERCOLATION TESTING <br /> The results of percolation tests completed by CTE are presented below. Copies of the field <br /> percolation test results are presented in Appendix D. V <br /> V Q,� 11B <br /> Test Soil Test Hole Percolatio Rate 1 SJCEHD <br /> Number Descri tionDepth ft. min./' ch Observed <br /> P-3 Clayey Silt 3.5 4$0 Yes l <br /> P-4 Silty Sand 12.5 6.67/ Yes <br /> r <br /> 4.3 NITRATE LOADING AND CALCULATIONS IL 1-1 , y p.� <br /> 15 \,LOD b q'n"51 r_7 <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/1 <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 /> _ I(NW)(1-D) + R(Nb) <br /> N° (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 /> 20200144.001 A/ST0191R95450 Page 7 of 12 May 8, 2019 <br /> ©2019 Kleinfelder www.kleinfelder.com <br />