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Soil Suitability / Nitrate Loading Study Irerracon <br />JPM m Lathrop, California <br />May 24, 2022 a Terracon Project No. NA227026 <br />1.5.3 Soil Lithology Observed <br />The following table below is based on the soils encountered during our field work. <br />Table 6. <br />Summary of Soil Lithology <br />Boring <br />Depth Interval (feet) <br />Soil Type <br />Unified Soil <br />Classification <br />0-0.33 <br />Topsoil <br />— <br />Dark brown, fine to <br />0.33-2.0 <br />medium, highly <br />SM <br />compacted, silty sand <br />61 (Soil profile) <br />Orange brown, fine to <br />medium silty sand, <br />2.0-6.5 <br />loosely compacted, <br />SM <br />micacous, met refusal at <br />6.5 feet bgs <br />0-0.17 <br />Topsoil <br />— <br />Dark brown, fine to <br />0.17-2.5 <br />medium, highly <br />SM <br />133 <br />compacted, <br />Orange brown, fine to <br />2.5-3.5 <br />medium sand with silt, <br />SP -SM <br />poorly graded, loose, <br />weak cementation <br />0-0.16 <br />Topsoil <br />— <br />Light brown, fine to <br />coarse sand with sift, <br />65 (Soil profile) <br />poorly graded loose, <br />0.16-5.0 <br />weak cementation, <br />SP -SM <br />micacous. Boring <br />collapsed. <br />0-0.16 <br />Topsoil <br />— <br />Light brown, fine to <br />66 <br />coarse sand with silt, <br />0.16-3.0 <br />poorly graded loose, <br />SP -SM <br />weak cementation, <br />micacous <br />It should be noted boring B5 (soil profile) was advanced to 5.0 feet bgs and groundwater was <br />encountered at 3.83 feet bgs by the end of field work on April 5, 2022; however, the boring <br />collapsed prior to EHD observation. A percolation test was not performed at 65 due to shallow <br />groundwater. <br />Responsive ■ Resourceful ■ Reliable 11 <br />