<p><p><strong>Reference(s):</strong></p><p><em>Schaefer et al. (2016)<br>Woodward (2005)</em></p><p><strong>Method Summary</strong></p><p>During the grout injection process, borehole cameras can be utilized to evaluate the adequacy of grout penetration. Boreholes are drilled into the grouted layers and closed circuit television cameras are inserted into the hole to observe and verify that the injection of the grout is satisfying project requirements.</p><p><strong>Accuracy and Precision</strong></p><p>Allows for visual inspection of the grout injection process to a certain extent.</p><p><strong>Adequacy of Coverage</strong></p><p>Bulk Infill Grouting literature provides no guidance on how many boreholes per unit area of a project are required to evaluate the grout penetration. One can assume that the number of borehole camera studies relies heavily upon the subsurface conditions of the project with respect to the layout and locations of subsurface voids.</p><p><strong>Implementation Requirements</strong></p><p>Access to a closed circuit television camera capable of being inserted into boreholes at great depths as well as the proper visual equipment is required in addition to personnel capable of using the devices.</p><p><strong>General Comments</strong></p><p>This technique is applicable to the QC objective of Adequacy of Grout Penetration.</p></p>