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<br /> Page 20 <br />testing frequencies specified in Section 3.2.2. <br /> <br />• Verify that clay materials are placed and compacted in accordance with the <br />Specifications. <br /> <br />• Perform nuclear density-moisture tests (ASTM D2922 and ASTM D3017) to verify that <br />each lift is compacted as required by the Specifications. Perform tests at testing <br />frequencies specified in Section 3.2.2. <br /> <br />• Verify that soil materials that are too wet for proper compaction per Specifications are <br />properly aerated and processed to bring the moisture content of the material into the <br />acceptable range of the optimum moisture content. <br /> <br />• Verify that clay soils that are too dry for proper compaction per Specifications are <br />properly moisture conditioned and processed to bring the moisture content into the <br />acceptable range of the optimum moisture content. <br /> <br />• Verify that acceptable moisture is maintained to reduce desiccation of the clay liner <br />surface. <br /> <br />• Verify that the clay liner surface is free of ruts, gouges, and other features that might <br />damage overlying geosynthetics. <br /> <br />• Coordinate with the Earthwork Contractor and Owner to perform verification surveys at <br />the completion of clay liner operations. Verify corrective action measures as determined <br />by verification surveys. Verification surveys will also be used to determine the limits of <br />clay liner and clay earthfill for measurement and payment applications. Submit copy of <br />verification surveys to the Construction Manager. <br /> <br />3.4.5 Subgrade Preparation <br /> <br /> <br />• Verify that grade control construction staking is performed prior to work. <br /> <br />• Verify that angular or sharp rocks, and other debris that could damage the geomembrane <br />are removed from the surface of the subgrade. Verify that the subgrade is free of <br />irregularities and is steel drum rolled smooth prior to geosynthetic placement. <br /> <br />• Verify that the final surface provides continuous and intimate contact with the overlying <br />geosynthetic. <br /> <br />• Coordinate with the Earthwork Contractor and Owner to perform subgrade verification <br />surveys upon completion of the subgrade preparation. Verify corrective action measures <br />as determined by the verification surveys. Verification surveys will also be used to