<p><p><strong>References:<br></strong><em>Avalle(2004b,c)<br>Avalle and Carter (2005)<br>Bouazza and Avalle (2006 a,b)<br>Pinrad (1999, 2001)<br>Landpac (2008b)</em></p><p><strong>Method Summary</strong></p><p>Use of ground elevation change as a QC/QA measure is described in the references listed above. This method provides a simple and yet effective means to assess improvement under IR compaction (Avalle 2004b). One major difficulty associated with this method is the selection of test locations for measurements due to the rough surface left behind the roller. This can be addressed by lightly trimming the surface with a grader (Bouazza and Avalle 2006). Elevations can be monitored using simple techniques such as using string lines and tape measure or by using more advanced options which include GPS, robotic total station, laser levels, and LIght Detection And Ranging (LIDAR).</p><p><em> </em><strong>Accuracy and Precision</strong></p><p>The accuracy and precision of the method depends on the test method used. Laser levels and robotic total station measurements are considered accurate and precise. String line and tape measures are relatively less accurate.</p><p><strong>Adequacy of Coverage</strong></p><p>The coverage adequacy depends on the number of measurement points. If roller mounted GPS is used, it provides almost near continuous data. GPS or laser receivers can be mounted on a truck to collect continuous data.</p><p><strong> </strong><strong>Implementation Requirements </strong></p><p>Use of GPS, robotic total station, and laser levels may require specialized equipment and training.</p><p><strong><em> </em></strong><strong>General Comments </strong></p><p>This method can be an effective QC or QA tool.</p></p>