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<br /> Page 25 <br />direst shear tests between the following surfaces: <br /> <br />60-mil textured HDPE geomembrane/clay liner <br />GCL/60-mil textured HDPE geomembrane/Geocomposite Drainage Net <br />60-mil textured HDPE geomembrane/cushion geotextile <br /> <br />The QA/QC Consultant shall obtain representative samples of all required materials to perform a <br />12-inch by 12-inch direct shear tests in accordance with ASTM D5321. The direct shear tests shall <br />be performed as described in the Specifications. The results of all interface direct shear testing shall <br />be provided in the CQA Report and to the Design Engineer. The Design Engineer will use these <br />results to reject non-conforming materials or to modify the refuse fill configuration, if necessary. <br /> <br />Sampling Procedure. Samples will be taken across the entire roll width. Samples may be cut for <br />shipping purposes, but a minimum of five square feet must be sent to the testing laboratory. <br />Samplers must mark the machine direction and the manufacturer's roll identification number on the <br />sample (each piece). Samplers will also assign an acceptance test number to the sample and mark <br />the sample with that number. <br /> <br />Test Results. The QA/QC Consultant will examine all results from laboratory acceptance testing <br />and will report any nonconformance to the Construction Manager. <br /> <br />Acceptance Test Failure. If a Geomembrane acceptance sample does not comply with the <br />minimum requirements of the Specifications, the Geomembrane roll from which the sample was <br />taken will be failed by the QA/QC Consultant, and replaced by the Geomembrane Manufacturer at <br />no additional cost to the Owner. The Design Engineer shall be contacted to determine additional <br />acceptance testing requirements. <br /> <br /> <br />4.2.3 Geomembrane Installation <br /> <br />Surface Preparation. The soil surface must be prepared in accordance with the Specifications. <br />Before geomembrane installation, the subgrade will be inspected by the QA/QC Inspector and <br />Geosynthetics Contractor. The QA/QC Inspector must verify the following: <br /> <br />• All lines and grades for soil surface have been verified by the Earthwork Contractor. <br /> <br />• The soil surface has been rolled and compacted to be free of surface irregularities, loose <br />soil, and protrusions. <br /> <br />• The soil surface does not contain stones or other objects that could damage the <br />geomembrane. <br /> <br />• The anchor trench dimensions have been checked, and the trenches are free of sharp <br />objects and stones.