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Soil Suitability/Nitrate Loading Study Irerracon <br /> Proposed Commercial Truck Yard ■ Stockton, CA <br /> August 16, 2019 ■ Terracon Project No. NA197053 <br /> 1.5.3 Soil Lithology Observed <br /> The following table presents a log of the soil boring(s). <br /> Table 6. <br /> Summary of Soil Lithology. <br /> Boring Depth Interval Soil Type Unified Soil <br /> (feet) Classification <br /> B1 0 to 3.5 Silty sand, fine grained, brown SM <br /> 0 to 4.0 Silty sand, fine grained, brown SM <br /> B2 4.0 to 4.7 Silty sand, fine grained, light SM <br /> brown <br /> 1.5.4 Discussion of Soil Lithology <br /> The soils encountered in our percolation test borings were generally fined grained silty sandy <br /> soils. Generally speaking, coarse-grained soil has a greater potential for percolation than fine- <br /> grained or cemented soil. <br /> Based on a review of the Krazan report, soils within the vicinity of the proposed leach field and <br /> reserve leachfield consisted of loose to very dense silty sand to medium dense sandy silt at 14 <br /> feet bgs. A boring advanced to 50 feet bgs identified a sandy clay layer between 14 and 28 feet <br /> bgs and silty sand and/or sand between 38 and 50 feet bgs. <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 /> One percolation test (131) was performed. <br /> 1.6.3 Boring Preparation and Presaturation <br /> The percolation test borings (131) and the soil profile boring (132) were handaugered on July 30, <br /> 2019. Approximately two inches of"pea gravel"was placed in the bottom of the open boring. A <br /> 2.0-inch diameter PVC pipe with perforations towards the bottom was installed on top of the gravel <br /> and the annular space was backfilled with "pea gravel". Presaturation of the percolation test hole <br /> Responsive■ Resourceful ■ Reliable 10 <br />