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Soil Suitability/ Nitrate Loading Study Irerracon <br />Thornton Road Trailer Parking Facility ■ Lodi, California <br />December 15, 2021 ■ Terracon Project No. NA217079 <br />1.5.3 Soil Lithology Observed <br />The following table below is based on the soils encountered in our soil profile boring P3 which <br />was advanced to 6.3 feet bgs. <br />Table 4. <br />Summary of Soil Lithology <br />Boring <br />Depth Interval (ft) <br />Soil Type <br />Unified Soil <br />Classification <br />0-1.1' <br />Sandy Silt, Dark Brown <br />ML <br />fine, soft <br />Pi <br />- ---- <br />1.1'-3' <br />Silty sand, Light Brown, <br />SM <br />fine to medium, Medium <br />0-1.3' <br />Sandy Silt, Dark Brown <br />ML <br />fine, soft <br />P2 <br />1.3'-3.5' <br />Silty sand, Light Brown, <br />SM <br />fine to medium, Medium <br />0-1.5' <br />Sandy Silt, Dark Brown <br />ML <br />fine, soft <br />1.5'-3' <br />Silty sand, Light Brown, <br />SM <br />P3 <br />fine to medium, Medium <br />Silty Sand, Orange <br />3'-6.3' <br />Brown, Fine to Medium <br />SM <br />hard <br />1.5.4 Discussion of Soil Lithology <br />The soils encountered in the percolation test borings consisted generally of silty sand in the upper <br />foot and layers of silty sand, from medium to hard compaction 1 foot to 6 feet. Refer to Table 5 <br />for more detailed lithology. Generally, coarse-grained soil has a greater potential for percolation <br />than fine-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 />1.6.2 Number of Percolation Tests <br />Three percolation tests were performed. <br />Responsive ■ Resourceful ■ Reliable 9 <br />