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ame& <br />• <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 November 2010 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 are presented in the Drawings section of this report and project <br />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 P). <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 Fine <br />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 />1.5 Record Survey Documentation <br />Ames Construction of Aurora, Colorado provided the Record Drawings for the activities <br />associated with the 2010 Phase 5 VLF. A Colorado Registered Land Surveyor prepared the <br />drawings. The Record Drawings are presented in Appendix A. The Surveyor's certificate is <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 6