<p><p><strong>References:<br></strong><em>Collin and Cowell (1998)<br>Rogbeck et al. (2003)<br>Porterfield, Cotton, and Byrne (1994)<br>Lazarte et al. (2015)<br>Byrne et al. (1998)</em></p><p><strong>Method Summary</strong></p><p>Deflections in the wall can be accurately measured over the length of the wall with surveying equipment. The site should be surveyed on a specified regular schedule in order to monitor and record any wall movements. The wall face and adjacent areas should be monitored.</p><p><strong>Accuracy and Precision</strong></p><p>This is a fairly accurate and precise test (accuracy within ±1/8 inch).</p><p><strong>Adequacy of Coverage</strong></p><p>Surveying equipment allows the inspector to survey a large area with one set up.</p><p><strong>Implementation Requirements </strong></p><p>Standard surveying equipment can be used. Little experience is necessary to become knowledgeable about using surveying equipment.</p><p><strong>General Comments</strong></p><p>Surveying can be used to record any wall movements during and after construction of a soil nail wall. Surveying does not provide resulting strength parameters, but can help to assess the success of a project based on recorded soil deformations. Surveying can be used to detect areas where excessive movement is occurring which is an indication of slope failure. Surveying can be used for both method and performance approach specifications.</p></p>