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B. Excavation: <br />3.2 LINER SUBBASE <br />remove them for delivery to the custody of the proper State or Federal <br />authorities. Such excavation will be considered and paid for as extra <br />work. <br />1. Unclassified: All excess suitable material excavated from the <br />project site and not used for embankment shall be removed from <br />the project site and become the property of the Contractor. Where <br />material encountered within the limit of the work is considered <br />unsuitable for embankment material on any portion of this project <br />work, such material shall be excavated as directed by the <br />Engineer and replaced with suitable fill material. <br />A. Liner subbase shall be prepared to the lines and grades as indicated on <br />the Drawings. <br />B. Liner subbase shall be installed according to the requirements of Section <br />02620: Geosynthetic Liner. <br />C. The surface of the liner subbase material shall be compacted with a <br />smooth drum roller to create a suitable surface for geosynthetic liner <br />placement. The subbase liner material shall be compacted at -1 percent <br />to +2 percent optimum moisture content as determined by ASTM D698 <br />and to a density equal to or greater than 90 percent of the maximum <br />density as determined by ASTM D 698. <br />D. The final surface shall be smooth and free of protrusions, ruts, and open <br />graded material. <br />E. The final surface is subject to approval by the liner installer and the <br />Design Engineer prior to placement of the geosynthetic liner. <br />3.3 BERM FILL <br />A. Random fill will be placed as noted in the Drawings. <br />B. Contractor shall moisture condition, place and compact berm fill by a <br />method compaction technique. The specifics of the method specification, <br />including the lift thickness, the method of compaction, and degree of <br />compaction will be dependent of the specific component of the work. <br />C. Compacted berm fill will be nominally compacted with the intent of <br />generally achieving a density approximating 90 percent of the ASTM D <br />698 maximum dry density, with a smooth surface not subject to erosion or <br />wheel rutting or settlement. <br />3.4 ANCHOR TRENCH FILL <br />A. Contractor shall supervise the anchor trench excavation for conformance <br />to the line, grade, and width shown on the Drawings, prior to liner system <br />Rio Grande Silver Tailings Evaporation Pond <br />August 2011 <br />02320 -5 <br />Earthwork <br />02320 <br />