<p><p><strong>References:<br></strong><em>Berg et al. (2009)<br>Morrison, et al. (2006b)<br>Simac, et al. (1993)<br>Simac, et al. (1990)<br>Tanyu, et al. (2008)</em></p><p><strong>Method Summary</strong></p><p>Performance monitoring differs based on the criticalness of the MSE structure. A limited performance-monitoring program includes monitoring of several parameters:<br><ul> <li>Horizontal movements of the face (for MSEW structures)</li> <li>Vertical movements of the surface of the overall structure</li> <li>Local movements or deterioration of the facing elements</li> <li>Drainage behavior of the backfill</li> <li>Performance of any structure supported by the reinforced soil, such as approach slabs for bridge abutments or footings</li></ul>A limited performance-monitoring program should be used on almost all MSE systems. A more complex monitoring program could be created which would include the investigation of the internal MSE structure as well. Some areas of concern for a more complex MSE exploration would include stresses in reinforcements, settlements, corrosion and degradation of reinforcement materials, and deflections in reinforcements.</p><p><strong>Accuracy and Precision</strong></p><p>These measurements will be accurate and precise if standard industry equipment is used.</p><p><strong>Adequacy of Coverage</strong></p><p>This QC/QA procedure may require a large number of measurements to determine the performance of the system.</p><p><strong> </strong><strong>General Comments</strong></p><p>Performance limited monitoring could be performed on all MSE projects. A comprehensive monitoring plan should be used for highly sensitive or unique applications, but the cost is often too costly to be not warranted for use on typical projects. Some form of a limited monitoring program is recommended for most MSE wall systems. Some agencies are using monitoring to support asset management of wall structures.</p></p>