<p><p><strong>Reference(s):</strong></p><p><em>Karol (2003)<br>Munfakah (1991)</em></p><p><strong>Method Summary</strong></p><p>Permeability measurements may be taken during grouting as QC measure and post construction as QA measure. Permeability measurements can be determined during grouting operations using water or the grouting medium as the permeating fluid. During multiple stage injections changes in permeability can be measured between stages indicating the performance of the treatment, in addition process controls can be modified in response. Permeability measurements are critical to the performance of water control grouting applications and can be conducted though separate bore holes to determine performance and geometry of grout zone.</p><p><strong>Accuracy and Precision</strong></p><p>Accuracy and precision of this test method is hard to quantify due to the nature of the measurement.</p><p><strong>Adequacy of Coverage</strong></p><p>Coverage can be limited due to measurements only at borehole locations.</p><p><strong>Implementation Requirements</strong></p><p>The method is relatively easy to implement with limited additional cost. Interpretation of the results and selection of bore holes requires experience.</p><p><strong>General Comments</strong></p><p>Permeability is directly applicable to moisture barrier applications. Permeability of the formation is also useful information to consider when predicting the resulting soil stress condition in the subsurface due to introduction of grout.</p></p>