<p><p><strong>References:</strong></p><p><strong></strong><strong>Method Summary</strong></p><p>Compacted soil sampling from borings to get “undisturbed” samples is an effective method for laboratory strength and modulus testing. Soil sampling from on-site stock piles can be helpful to conduct classification, compaction, 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. Also different laboratory compaction methods (impact, static, vibratory, gyratory, or kneading) may result in different properties (White et al. 2007a). The following table provides a list of tests that can be performed on soil samples and its use for QC/QA.<br><h3>Table 2. Summary of laboratory tests, sample type required, and its applicability for QC/QA</h3><table class='tablepress' id='tablepress-1989'><thead><th><center>Test</th><th><center>Type of Sample*</th><th><center>QC or QA</th></thead><tbody><tr><td ><center>Atterberg limits</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QC/QA</td></tr><tr><td ><center>Water content</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QC/QA</td></tr><tr><td ><center>Particle size distribution</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QC/QA</td></tr><tr><td ><center>Proctor</td><td ><center>■</td><td >QC/QA</td></tr><tr><td ><center>Density</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" /></center> </td><td >QC/QA</td></tr><tr><td ><center>Organic content</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QC</td></tr><tr><td ><center>Consolidation</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QA</td></tr><tr><td ><center>Permeability</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QA</td></tr><tr><td ><center>Shear strength</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QA</td></tr><tr><td ><center>Resilient modulus</td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QA</td></tr><tr><td ><center>R-value</td><td ><center>■</td><td >QA</td></tr><tr><td ><center>California Bearing Ratio</td><td ><center>■</td><td >QA</td></tr><tr><td ><center>Freeze/thaw susceptibility </td><td > <center><img src="http://geotechtools.geoinstitute.org/app/uploads/2018/03/check-mark.png…; alt="" width="22" height="16" class="alignnone size-full wp-image-479" />■</center> </td><td >QA</td></tr></tbody></table><br><p class="disclaimer">√ “Undisturbed” Shelby tube sample</p><p class="disclaimer">■ Disturbed samples (from stock pile) which require samples be reconstituted in the lab for testing.</p><p class="disclaimer">^* “Undisturbed” samples cannot be obtained for granular materials</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. <strong> </strong></p><p><strong> </strong><strong>Adequacy of Coverage</strong></p><p>These tests represent soil properties of the sample obtained only. Experience is required to interpret soil layering information from multiple soil borings and samples.</p><p><em> </em><strong>Implementation Requirements </strong></p><p>A drill rig will be needed if “undisturbed” samples are to be obtained from greater depths. Disturbed samples from shallow depths can be obtained using hammer-driven Shelby tubes or test pit excavation.</p><p><strong>General Comments </strong></p><p>Obtaining samples enables visual inspection of the material and provides material for conducting a variety of QA related tests as described above. It is helpful to assess the improvement if before and after compaction are performed.</p></p>