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Al. <br /> Cripple Creek&Victor Gold Mining Company <br /> Squaw Gulch VLF Phase 1 (9.450 foot to 9.550 foot bench) amec <br /> Final Report Addendum foster <br /> Quality Assurance Monitoring&Test Results wheeler <br /> December 1 2015 <br /> 7.2 Project Technical Specification Deviations <br /> During construction, requests were made by the contractor (Ames) to deviate from the <br /> project technical specifications. Below is a summary of the project technical specification <br /> deviations. <br /> • Section 02776 (Appendix E) of the project technical specification states "The rolls <br /> (of liner) shall be stored on a prepared surface (not wooden pallets) and should not <br /> be stacked more than two rolls high". Amec Foster Wheeler allowed the rolls of liner <br /> to be stacked three rolls high provided safety measure were in place to prevent rolls <br /> from shifting at any time and personnel refrain from climbing on the rolls to access <br /> the lifting straps. <br /> • The resin lot certificates provided for the welding rod do not match the resin lots used <br /> during production of the 80-mil DSMS LLDPE geomembrane; since the resin is the <br /> same, the lots were acceptable for use per project technical specifications. Extrusion <br /> weld integrity was verified and accepted with trial welds tests and destructive testing <br /> during installation. <br /> • Concrete test W1 (summary of underground working concrete testing located in <br /> Appendix M.3) as part of the underground workings had a slump outside of the <br /> project technical specifications. Due to the unique and challenging situation of <br /> potentially having to remove the concrete from a working, it was agreed upon to wait <br /> for compressive strength test results. If the concrete compressive strength was <br /> achieved, the concrete was to remain in place. Having a lower slump is not <br /> necessarily indicative of bad concrete, it either had a lower water to cement ratio or <br /> the concrete had begun curing. Slump is estimated to decrease 2 inches per hour. <br /> Amec Foster Wheeler determined the concrete was acceptable based on the <br /> passing compressive strength tests results. <br /> • Underground working No. 6320 (refer to Figure UG27 in Appendix M.1) used 45 <br /> cubic yards of flowable fill material in place of cemented rockfill. Cemented rockfill <br /> material does not have a minimum compressive strength requirement whereas <br /> flowable fill does(300 psi). There was an excess of flowable fill on the project during <br /> the remediation of this underground working, rather than waste the material, it was <br /> allowed that the flowable fill be used in place of the cemented rockfill. <br /> • Amec Foster Wheeler allowed the use of Low Volume Solution Collection Fill <br /> material in place of LDF. The properties of the two materials are very similar, and <br /> both materials meet both the required specifications (refer to Section 02200 in <br /> Appendix E). <br /> 32 <br />