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• Coordinate with the Earthwork Contractor and Owner to perform excavation verification <br /> surveys upon completion of excavating operations. Verify corrective action measures as <br /> determined by verification surveys. Verification surveys will also be used to determined <br /> limits of excavation for measurements and payment applications. Submit copy of <br /> verification surveys to the Construction Manager. <br /> 3.4.3 General Earthfill and Subgrade Fill <br /> • Verify that construction staking is performed before work and that survey bench marks <br /> with elevations are secured outside the work area. <br /> • Perform visual and manual soil classifications (ASTM D2488) to verify that material <br /> source is suitable for earthfills. Verify that the material is free of organic and oversized <br /> materials. Perform classifications continually during excavation of borrow materials. <br /> • Perform moisture-density relationship testing(ASTM D1557)to determine the maximum <br /> dry density and optimum moisture content of earthfill materials. Perform tests at testing <br /> frequencies specified in Section 3.2.2. <br /> • Verify that earthfill materials are placed and compacted in accordance with the <br /> Specifications. If a sheepsfoot compactor is not used, verify that the top of each <br /> compacted lift is scarified before placing the subsequent lift. <br /> • Verify that general earthfill placed around HDPE tanks is appropriately compacted.Hand <br /> held compaction equipment may be necessary to obtain adequate compaction around <br /> HDPE tanks. <br /> • Perform nuclear density-moisture tests(ASTM D2922 and ASTM D3017)to verify that <br /> each lift is compacted as required by the technical specifications. Perform tests at testing <br /> frequencies specified in Section 3.2.2. <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 /> • Verify that earthfill 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 /> • Verify that desiccated earthfills are properly repaired or removed before placing <br /> subsequent lifts. <br /> Page 21 <br />