2012-02-28_REVISION - M1980244 (75)

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PART 6: EARTHWORKS CONSTRUCTION QUALITY ASSURANCE Construction of the valley leach facility or specified earthworks shall be in accordance with the DRAWINGS and SPECIFICATIONS. A CQA monitoring and testing program shall be implemented by CC &V to ensure construction compliance by the CONTRACTOR. The CQA testing program shall consist of construction testing of materials used in the valley leach facility construction. The types of materials are defined in the SPECIFICATIONS. During construction, the CQA Monitor shall sample and test these soil types to determine if they meet SPECIFICATIONS. The CQA Monitor shall obtain and test soil samples in accordance with American Society for Testing and Material standards ASTM D75 and ASTM D420. All tests shall be performed by the CQA Monitor on -site or in a geotechnical laboratory approved by the CERTIFYING ENGINEER . 6.01 CONSTRUCTION TESTING: During construction, the CQA Monitor shall test all earthwork components to verify that the construction is in accordance with the SPECIFICATIONS. Testing shall be performed on all soil used in the construction to confirm the materials meet SPECIFICATIONS. The CQA Monitor shall conduct testing after final placement of the materials. The tests to be performed, and the testing frequency, for each material type are listed in Tables 1 and 2. The testing frequencies specified in Tables 1 and 2 shall be increased when the CQA Monitor determines that construction conditions (such as adverse weather, equipment breakdown, improperly ballasted compactor, excessive lift thickness, improper soil type, improper moisture conditioning and compaction) warrant additional tests. Additional tests will be approved by MANAGER and directed by the CQA Monitor. 6.02 CONSTRUCTION MONITORING: The CQA Monitor will monitor and test all earthwork quality assurance components of the construction to verify that the construction is in accordance with the SPECIFICATIONS. The CQA Monitor shall identify inadequate construction methodologies or materials that may adversely impact the performance of the facility being constructed and existing structures. The CQA Monitor will record visual observations throughout the construction process to ensure that the materials are placed to the minimum dimensions as shown on the DRAWINGS. Quality control testing will be performed by the CONTRACTOR. 6.02.01 FOUNDATION PREPARATION: The CQA Monitor shall observe and document the foundation preparation including: ame0 stripping and excavation activities to ensure that CONTRACTOR places the material in the appropriate stockpile (Structural Fill, Select Structural Fill, Underdrain Fill, Leak Detection Fill, Low Volume Solution Collection Fill, Bedding Fill, Soil Liner Fill, Drain Cover Fill, Fine Shaft Backfill, Pipe Bedding Material and Granular Filter Material), if stockpiling is necessary; stockpiling activities to verify location of stockpile, material type, and dressing; excavations for moisture seeps, unsuitable foundation soil, elevation, and proper drainage; subgrade preparation to confirm that the surface of the subgrade is free of soft, organic, and otherwise deleterious materials (such as debris, branches, vegetation, mud, ice, or frozen materials); and that soil and rock surfaces that contain joints or fractures are adequately filled in accordance with the SPECIFICATIONS; and Section 01400 1 Page 5 of 10 January 14, 2011 Earthworks CQA Plan Revision 0 S \Projects \1125G Squaw Gulch Valley Leach Facililty Design \I - Tech Specs \01400 1 r0 doc