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Soil Suitability/ Nitrate Loading Study Herracon, <br />Eagle's Nest Motorcycle School Stockton, California <br />July 27, 2021 Terracon Project No. NA217040 <br />1.5.3 Soil Lithology Observed <br />The following table below is based on the soils encountered in boring P4 which was advanced to <br />25 feet bgs. <br />Table 5. <br />Summary of Soil Lithology <br />Boring <br />Depth Interval (ft) <br />Soil Type <br />Unified Soil <br />Classification <br />0-3 <br />Fat clay, black, hard, high <br />CH <br />plasticity <br />3-12 <br />Lean clay, brown, hard, <br />CL <br />medium plasticity <br />12-14 <br />Silt, very stiff, brown to <br />ML <br />olive brown <br />14-15 <br />Sandy silt, hard, brown to <br />ML <br />olive brown <br />P4 <br />Poorly graded sand with <br />15-18 <br />silt, brown fine to medium <br />SP -SM <br />grained <br />18-20.5 <br />Sandy silt, light brown to <br />ML <br />brown, stiff <br />Poorly graded sand, <br />20.5-22 <br />brown, fine to medium <br />SP <br />grained <br />22-25 <br />Silt, hard, olive brown to <br />ML <br />brown <br />1.5.4 Discussion of Soil Lithology <br />The soils encountered in the percolation test borings and soil profile consisted primarily of fat to <br />lean clay in the upper 12 feet and silt, sandy silty and/or poorly graded sand from 12 to 25 feet <br />bgs. Generally speaking, coarse-grained soil has a greater potential for percolation than fine- <br />grained or cemented soil. <br />1.6 Percolation Test Information <br />1.6.1 Percolation Test Locations <br />Refer to Section 1.5.1 and Appendix A, Exhibit 2. <br />Responsive ■ Resourceful ■ Reliable 10 <br />