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A ERC <br /> 2. Stratum 2:This layer starts at the sediment/native ground intercept and is characterized as clayey <br /> sand to sandy clay. <br /> 3. Stratum Three: Here the subsurface transitions into the weathered bedrock layer and consists of <br /> high plasticity,stiff clay. <br /> In addition to the 2019 geotechnical investigation,three test pits were excavated on the periphery of the <br /> lake near the In-Res Settling ponds and in April 2024,a sample of the dredged materials was obtained and <br /> tested. Samples from the 2022 test pit investigation were subjected to particle size analysis (PSA) and <br /> Atterberg limit testing and the results are in Table 2.1. About half of the samples tested consisted of silty <br /> sand while the other half classified as clayey sand. About 50%of the material was of a size that is desirable <br /> for use as frac sand. <br /> When the dredged sample was collected in 2024, a hydro cyclone had been added to the operation to <br /> more effectively remove a significant amount of water more quickly. Underflow(solids)from the cyclone <br /> were discharged and worked into a stockpile while overflow (water and fines)was fed to a settling pond. <br /> A sample was taken from both the underflow and overflow and PSA and Atterberg limits testing were <br /> completed on the samples. It was estimated that 70% of the dredged materials were coming out as <br /> underflow and 30% as overflow. Based on the ratio, a PSA test was recreated to represent the base <br /> material. These results are shown on Figure 3.2 and indicate that the material consists of 70%sand and <br /> 30%fines. The 70%sand portion is of a size that can be used for frac operations. <br /> 6 <br />