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ameO <br />personnel prepared daily observation reports. AMEC submitted these daily summary <br />reports to CC &V. Daily reports are not included in this report, but were available for <br />Colorado Division of Reclamation Mining and Safety (DRMS) review during the course of the <br />project. <br />1.3.2 Weekly Construction Summary Reports <br />AMEC prepared weekly construction summary reports which were submitted to CC &V and <br />to the DRMS. Weekly reports from the period of January 2009 through August 2011 are <br />presented in Appendix D. <br />1.4 Project Specifications <br />All work was performed in accordance with the design plans and specifications presented in <br />Amendment No. 9 to Mining Permit M- 1980 -244 and subsequent revisions, as approved by <br />DRMS. IFC Drawings relevant to the current construction are presented in the Drawings <br />section of this report, and project specifications are presented in Appendix E. <br />If construction and /or specification modifications were warranted due to site - specific <br />conditions, documentation was submitted to CC &V for DRMS approval (see Appendix M). <br />No changes were implemented without DRMS approval. A summary of items that were <br />addressed during construction are summarized below as follows: <br />• April 2009. AMEC accepted a variance in the plastic index (PI) of the <br />Fine Shaft Backfill (FSB), Pipe Bedding Material (PBM), and Granular Fill <br />Material (GFM). The PI of these materials was increased from 5 to 15. <br />The increase in PI is considered insignificant by AMEC based on <br />experience with similar projects and the required performance of these <br />materials. <br />• July 2010. AMEC submitted a change in the Soil Liner Fill (SLF) <br />specification, increasing the fines content (minus 200 sieve) from 50 to 65 <br />to allow blending of materials. In addition, the requirement to conduct <br />permeability tests on in -field samples was modified to allow permeability <br />of stockpile samples. The frequency of permeability testing was increased <br />from one test per 5,000 cubic yards to one test per 4,000 cubic yards. <br />AMEC Earth & Environmental, Inc. <br />2000 S. Colorado Blvd 2 -1000 <br />Denver, CO 80222 <br />Tel 303 - 935 -6505 <br />Fax 303 - 935 -6575 www amec.com <br />5 <br />