<p><p><strong>Reference(s):</strong></p><p><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Lukas (1986) </em><em>Lukas (1995)</em><em>Mitchell (1981b)</em><em>Schaefer et al. (1997)</em></p><p><strong>Method Summary<br></strong>Measurements of the crater depth and the ground heave around the crater should be done after each series of tamper drops. Greater than expected crater depths can signal areas that need additional densification. Applied energy should be reduced if crater depths exceed 1 ½ to 2 times the tamper height.</p><p><strong>Accuracy and Precision<br></strong>If done properly and in a consistent manner, crater depth and ground heave measurements are an strong indication of areas that may need additional compaction.</p><p><strong>Adequacy of Coverage<br></strong>Crater depth and ground heave measurements must be done after each series of tamper drops, but are not difficult or time consuming to perform.</p><p><strong>Implementation Requirements<br></strong>Measurements of crater depth and ground heave are not difficult to perform.</p><p><strong>General Comments<br></strong>Crater depth and ground heave measurements should be used in any deep dynamic compaction program.</p></p>