<p><p><strong>References:<br></strong></p><p><strong>Method Summary</strong></p><p>The shear strength and permeability of the column are dependent upon stone gradation. For QC purposes, gradation analyses should be run on stone samples prior to installation. Gradation analyses should also be run on samples taken from the column after installation to ensure that the in-place gradation meets the specifications.</p><p><strong>Accuracy and Precision</strong></p><p>Gradation analyses provide the grain-size distribution of the sample tested, but not necessarily of the column as a whole.</p><p><strong>Adequacy of Coverage</strong></p><p>See comment for <em>Accuracy and Precision</em>.</p><p><strong>Implementation Requirements </strong></p><p>Gradation analyses are quickly and inexpensively run by all soils testing laboratories.</p><p><strong>General Comments</strong></p><p>Proper stone gradation is important for all stone column applications.</p><p>&nbsp;</p></p>