<p><p><strong>Reference(s):</strong></p><p>Soil samples can be collected to conduct classification, index, strength, and modulus testing. It must be noted that strength and modulus testing conducted on laboratory compacted samples may result in different properties than field samples due to differences in stress conditions and soil structure. The following table provides a list of tests that can be performed on soil samples and their use for QC or QA.<br><h3>Table 3. Summary of laboratory tests and its applicability for QC/QA.</h3><table class='tablepress' id='tablepress-1934'><thead><th><center>Test</th><th><center>IQC or QA</th></thead><tbody><tr><td ><center>Atterberg limits</td><td ><center>QC/QA</td></tr><tr><td ><center>Water content</td><td ><center>QC/QA</td></tr><tr><td ><center>Particle size distribution</td><td ><center>QC/QA</td></tr><tr><td ><center>Proctor </td><td ><center>QC/QA</td></tr><tr><td ><center>Density</td><td ><center>QC/QA</td></tr><tr><td ><center>Organic content</td><td ><center>QC</td></tr><tr><td ><center>Consolidation</td><td ><center>QA</td></tr><tr><td ><center>Shear strength</td><td ><center>QA</td></tr><tr><td ><center>Resilient modulus</td><td ><center>QA</td></tr><tr><td ><center>California Bearing Ratio (CBR)</td><td ><center>QA</td></tr></tbody></table></p><p><strong>Accuracy and Precision</strong></p><p>Accuracy and precision of the test depends on the test method. Most of these test methods are widely used in geotechnical engineering practice and have been standardized by ASTM and AASHTO.</p><p><strong>Adequacy of Coverage</strong></p><p>These tests measure soil properties of the sampled soil only. Experience is required to interpret soil layering information from multiple soil borings and samples.</p><p><strong>Implementation Requirements </strong></p><p>A drill rig will be needed if “undisturbed” samples are to be obtained from greater depths. Undisturbed samples from shallow depths can be obtained using hammer-driven Shelby tubes or test pit excavation.</p></p>