<p><p><strong>Reference(s):<br></strong><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Han (1998)</em><em>Kumar (2001)</em><em>Lukas (1986)</em><em>Lukas (1995) </em><em>Mackiewicz and Camp (2007)</em><em>Mitchell (1981b)</em><em>Schaefer et al. (1997)</em></p><p><strong>Method Summary<br></strong>As with cone penetration tests, standard penetration tests should be performed both before and after compaction to determine relative changes in soil properties. When compaction has been completed, the SPTs should not be performed until the excess pore water pressures have dissipated. As post-compaction aging effects may be significant in many soils, a minimum time period between the end of compaction and the start of SPT testing should be specified.</p><p><strong>Accuracy and Precision<br></strong>In certain soil conditions, SPTs can produce acceptable estimates of soil properties through correlations.</p><p><strong>Adequacy of Coverage<br></strong>Standard penetration tests can be used to get an accurate picture of the entire subsurface profile. However, N-values recorded in gravels or soils with debris may be sporadic and yield artificially high counts.</p><p><strong>Implementation Requirements<br></strong>Standard penetration tests are standard geotechnical tests that can be done by numerous firms.</p><p><strong>General Comments<br></strong>SPTs can be used in any deep dynamic compaction program and are favored in soils where there is a risk of liquefaction unless the soil contains significant amounts of gravel or cobbles.</p></p>