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KLE/NFELOER <br /> e.,gnr r,pf,.R,ghr W.1-,. <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 existing <br /> septic system. Additionally, the site could handle an additional 69 daily occupants without <br /> exceeding the state drinking water standard for nitrate (N) concentration. <br /> 6.2 PERCOLATION TESTING <br /> The results of our percolation tests are presented below. Copies of the field percolation test results <br /> are presented on Figure 5. <br /> Test Soil Description Test Hole Percolation Rate SJCEHD Observed <br /> Number Depth ft. min./inch <br /> P-1 Silty Sand 6 27.7 Yes <br /> P-2 Gravel with Sand 23 7.57 Yes <br /> 6.3 NITRATE LOADING AND CALCULATIONS <br /> Per SJCEHD requirements, the following summarizes our nitrate loading calculations for the <br /> existing leach field. The state drinking water standard for nitrate is 45 mg/I (NO3) and 10 mg/I as <br /> 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 3.94-acre parcel in which the existing septic system is located. <br /> I(N�,)(1-D) + R(Nb) <br /> N� _ (I+R) <br /> 20210068.001A/ST020R110989 Page 9 of 14 April 30, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />