June 2022 G-01483.84-017-R-Rev0 Because the 12 Sample Reference Depth (m bgl) Description Liquid Limit (%) Plastic Limit (%) Plasticity Index (%) Moisture content (%) WFBH009 3 Sandy clayey SILT with trace gravel 89 47 42 56 WNDD007 3.0 - 3.2 Clayey SILT, minor sand 103 60 43 66 WNDD007 4.6 - 4.8 Clayey SILT, minor sand 100 46 54 60 The Atterberg limit results have been plotted on a Unified Soil Classification System (USCS) plasticity chart below (Figure 6). The USCS chart places most of the samples below the A line and within the extremely high plasticity range. The only exceptions are WFBH009 positioned below the A line within the very high plasticity range, and WFBH004 (1.8 – 2.0 m) positioned above the A line within the high plasticity range. Samples classified as extremely high plasticity, WFTP015, WFTP027, WFTP030 and WFTP037 are positioned outside of the USCS chart due to high liquid limits of 194 %, 184 %, 201 % and 180 % respectively. Figure 6: Results of Atterberg limits testing presented on USCS plasticity chart. 0 10 20 30 40 50 60 70 80 0 20 40 60 80 100 120 Plasticity Index, PI (%) Liquid Limit, LL (%) USCS Plasticity Chart WFTP017 (0.5 m) - Sandy SILT WFTP024 (3.1 m) - Silty CLAY and WFTP028 (3.4 m) - Clayey SILT WFTP030 (0.5 m) - Silty SAND WFTP031 (1.4 m) - Silty CLAY WFTP032 (3.5 m) - Sandy SILT WFTP036 (3.7 m) - Clayey SILT WFTP037 (0.8 m) - SILT WFBH004 (1.2 - 1.4 m) - Clayey Sandy SILT WFBH004 (1.8 - 2.0 m) - Sandy Clayey SILT WFBH002 (2.0 m) - Clayey SILT WFBH009 (3.0 m) - Clayey Sandy SILT WNDD007 (3.0 - 3.2 m) - Clayey SILT WNDD007 (4.6 - 4.8 m) - Clayey SILT High Plasiticity Very High Plasiticity Extremely High Plasiticity SF SC ML CL CI CH CV CE MI MH MV ME
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