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January 24, 2000 -2- 993-2011 <br /> with the 1999 Phase III VLF Construction Specifications. Results and approximate <br /> locations of field density testing performed on Backfill and SLF are presented in <br /> Attachment B. Although no Permeability testing was specifically performed on SLF placed <br /> at the 1999 ADR Expansion, Golder is presenting representative test result from 1999 <br /> Phase III VLF Construction testing in Attachment B. <br /> Golder observed the deployment, seaming, defect repair, and testing (Destructive and Non- <br /> Destructive) of approximately 19,000 square feet of 80-mil single sided textured LLDPE <br /> geomembrane deployed by Poly-flex for the 1999 ADR Expansion construction. <br /> Geomembrane was supplied and tested in accordance with the 1999 Phase III VLF <br /> specification and was placed on the interior of the ADR Expansion Facility to form a single <br /> lined containment sump and on the exterior of the ADR Expansion to construct a composite <br /> liner system that connected to the existing Phase I composite liner system. CQA <br /> observation records and test results for the installation of geomembrane are presented in <br /> Attachment C. <br /> Golder visually monitored the placement of approximately 750 cubic yards of Drain Cover <br /> Fill placed over geomembrane installed on the exterior of the 1999 ADR Expansion. <br /> Golder observed that DCF was placed a minimum of two feet thick, that no geomembrane <br /> wrinkles were folded, and no unsuitable material was present in the fill. <br /> Relevant information required by the Phase III VLF Construction Specifications for the <br /> placement of "Fill" and geomembrane that is not presented in the attachments, such as <br /> ambient air temperature, geomembrane installer qualifications, etc., can be found in the <br /> 1999 Phase III CQA Certification Report prepared by Golder titled, "Cresson Project <br /> Quality Assurance Monitoring and Test Results, 1999 Phase III Valley Leach Facility <br /> Teller County, Colorado". <br /> The earthworks and geosynthetics observed by Golder for the 1999 ADR Expansion <br /> construction performed by ISI, Ames, and Poly-flex was in accordance with the applicable <br /> CEntry and 1999 Phase III VLF Construction Specifications for the Cresson Project. <br /> Golder appreciates the ongoing opportunity to provide engineering and CQA services for <br /> the Cresson Project. Please contact the undersigned with any questions. <br /> Sincerely, <br /> GOLDER ASSOCIATES INC. <br /> eniorZrojecMtManagerS - Mining <br /> JFL/llr <br /> 1:\9%2011\1260\ADR\2011ADR.DOC Golder Associates <br />