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Soil Suitability/ Nitrate Loading Study 1rerracon <br /> Manteca Farm Improvement Manteca, California <br /> October 29, 2019 Terracon Project No. NA197073 <br /> Table 6. <br /> Summary of Soil Lithology. <br /> Boring Depth Interval Soil Type Unified Soil <br /> (feet) Classification <br /> 131 0 to 3.5 Silty sand,fine to medium SM <br /> grained, brown <br /> 0 to 8.0 Silty sand, fine to medum SM <br /> B2 grained, brown <br /> 8.0 to 10.0 Silty sand, fine grained, brown SM <br /> 1.5.4 Discussion of Soil Lithology <br /> The soils encountered in our percolation test borings were generally fined to medium grained silty <br /> sandy soils. Generally speaking, coarse-grained soil has a greater potential for percolation than <br /> 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 /> One percolation test (131)was performed. <br /> 1.6.3 Boring Preparation and Presaturation <br /> The percolation test boring (B1) and the soil profile boring (B2)were handaugered on September <br /> 18, 2019. Approximately two inches of"pea gravel"was placed in the bottom of the open boring. <br /> A 2.0-inch diameter PVC pipe with perforations towards the bottom was installed on top of the <br /> gravel and the annular space was backfilled with "pea gravel'. Presaturation of the percolation <br /> test hole occurred approximately 24 hours prior to the day of testing. The depth of water used to <br /> pre-soak the shallow borings was approximately 1.0 foot above the top of the gravel. <br /> 1.6.4 Condition of Borings after Presaturation <br /> Boring B1 was dry and intact after the 24-hour pre-soak period. <br /> Responsive■ Resourceful ■ Reliable 11 <br />