2012-12-27_REPORT - M1980244 (17)

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Section 02200 Earthworks 7. CONTRACTOR shall place Drain Cover Fill at a rate such that the geomembrane liner is not exposed to ultraviolet light for more than 180 days. 8. CONTRACTOR shall provide close continuous monitoring at the point of placement during the placement of the Drain Cover Fill over geosynthetics. 9. CONTRACTOR shall verify the final thickness of Drain Cover Fill to determine compliance with this SPECIFICATION. CONTRACTOR shall record verification location, elevation, and thickness. CQA Monitor shall witness all verification measurements. CONTRACTOR will submit a method of verifying Drain Cover Fill depth to MANAGER for approval. Grade markers shall be placed on a 50 -by -50 -foot grid with additional points required for breaks in grade. CONTRACTOR shall remove all grade markers under supervision of CQA Monitor after verification measurements have been approved by MANAGER and CERTIFYING ENGINEER and will backfill holes with Drain Cover Fill. Areas with deficient thickness shall be reworked by CONTRACTOR, until acceptable measurements are obtained. If MANAGER or CERTIFYING ENGINEER suspects the occurrence of any damage to the underlying geosynthetics, MANAGER will instruct CONTRACTOR to remove Drain Cover Fill to expose the geosynthetics. CONTRACTOR shall uncover, repair any observed damage of the underlying geosynthetics, in accordance with the repair requirements of Sections 02776.0 and 02777.0 of these SPECIFICATIONS and recover, at no cost to CC &V. 10. CONTRACTOR will provide adequate illumination as approved by MANAGER, if Drain Cover Fill placement is carried out at night. A minimum of 2 -foot candles measured at the synthetic liner shall be used when Drain Cover Fill placement is carried out at night. I. Pipe Bedding Material 1. Pipe Bedding material shall be placed around the CSP as shown on the drawings. ame0 requirements of Sections 02776.0 and 02777.0 of these SPECIFICATIONS, and recover, at no cost to CC &V. 2. For piping external to the valley leach facility, CONTRACTOR shall compact the Pipe Bedding Material requiring compaction to at Least 95 percent of the maximum dry density as determined by the Standard Proctor density test (ASTM D698), and a moisture content 3 percent below and 3 percent over the optimum moisture content. 3. CONTRACTOR shall place Pipe Bedding Material in maximum 12 -inch loose lifts. Pipe Bedding Material will be worked under pipe haunches by hand to provide uniform support of the CSP. 4. Native material used for backfilling CSP excavation shall be placed in 12 -inch to 18 -inch loose lifts, and compacted by wheel rolling with light, rubber tired or other light compaction equipment, as approved by CERTIFYING ENGINEER. J. Granular Filter Material 1. Granular Filter Material shall be placed beneath the Riprap as shown on the drawings. P \Phase 5 OSA 2011 Cert Report\Appendices\Appendix E Specifications \02200 r1 doc Page 16 of 18 September 3, 2008 Revision 1