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placement. The CQA Monitor shall verify that the anchor trench has been <br />constructed according to the Drawings. Anchor trenches shall not be <br />excavated more than seven (7) work days prior to cover liner installation <br />by Contractor, and shall be backfilled within two (2) days of cover liner <br />deployment. Seams within limits of the anchor trench do not require <br />CQC /CQA testing, and backfilling of anchor trenches should not be <br />delayed for CQC or CQA activities. <br />Slightly rounded corners shall be provided in the trench where the cover <br />liner adjoins the trench so as to avoid sharp bends (greater than sixty [60] <br />degrees) in the cover liner. <br />B. The anchor trench shall be backfilled and compacted with a method <br />specification as approved by the Project Manager and Design Engineer. <br />Anchor trench fill material shall be moisture conditioned, placed In 8- to <br />12 -inch thick loose lifts, and compacted by wheel rolling with light, rubber - <br />tired, or other light compaction equipment. <br />Care shall be taken when backfilling the trenches to prevent any damage <br />to the cover liner. At no time shall construction equipment come into <br />direct contact with the cover liner. If damage occurs, it shall be repaired <br />by the Contractor prior to the completion of backfilling. <br />3.5 AGGREGATE BASE COURSE <br />A. Place aggregate base course in a single 4 -inch lift ensuring that the <br />materials placed are a homogeneous mixture. <br />B. Compact to a minimum density of 90 percent of maximum per ASTM D <br />698. <br />3.6 FIELD QUALITY <br />A. Tests <br />1. Give advance notice of at least 24 hours to Engineer when ready <br />for compaction or subgrade inspection. <br />2. Notify the Design Engineer prior to commencement of proof rolling <br />of the foundation. <br />3. The Design Engineer may perform in -place density, and moisture <br />content tests to evaluate whether the materials meet requirements <br />of the Specifications. <br />4. The Design Engineer may perform gradation and plasticity tests to <br />evaluate whether the materials meet requirements of the <br />Specifications. <br />5. Assist the Design Engineer in obtaining representative samples <br />for testing. <br />6. Other tests may be performed as deemed necessary by the <br />Rio Grande Silver Tailings Evaporation Pond <br />August 2011 <br />02320 -6 <br />Earthwork <br />02320 <br />