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KL E/NFEL OER <br /> s.pnr noox xmnr sow;:c:. <br /> 11 CONCLUSIONS <br /> The results of our percolation tests indicate that a near surface suitable soil percolation stratum <br /> does not exist at the percolation test location at the SJCEHD observed depth tested of about <br /> 3 feet below existing site grade. However, a suitable soil stratum does exist at the percolation <br /> test location at the SJCEHD observed depth tested of about 25 feet below site grade. According <br /> to the California Water Boards OWTS Policy (June, 2012) a suitable soil condition is defined as <br /> a stratum capable of percolating water at a rate of not faster than 1 minute per inch (MPI) or <br /> slower than 120 MPI. <br /> The nearest water bodies to the site are Mormon Slough about '/2 mile to the north and Duck <br /> Creek which is about 1/2 to the south. Due to the distance to the Mormon Sough and Duck Creek <br /> and the general gradient of groundwater (to the east to northeast), we anticipate that the impact <br /> to surface water will be low. <br /> Even though the estimated waste/septic flow and nitrate concentration of the leach field effluent <br /> value used in our calculations are likely conservative, it is our professional opinion that a <br /> conventional septic tank/leach trench/seepage pit sewage disposal system designed per <br /> SJCEHD criteria will adequately serve the proposed new facility. However, it should be noted <br /> that a shallow leach line system alone will not work due to the lack of percolation in the near <br /> surface soils. Accordingly, the system will need seepage pits incorporated into the design. We <br /> do not see the need for an engineered septic system to be installed at the site. <br /> 20173772.001A/ST017R57809 Page 12 of 15 April17, 2017 <br /> ©2017 Kleinfelder www.kleinfelder.com <br />