2019-10-25_REVISION - M1980244 (11)

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NEWMONT GOLDCORR a. The first bullet states, "The grading changes were minor and presented in the Record of Construction Drawings"? Please indicate which ROC drawings and describe how these minor grading changes are shown in these drawings. The minor grading changes where done in the field to best fit the actual field conditions. These changes didn't alter the intent of the design, which is to have solution drain towards the PSSA. As with previous submittals, these changes were not identified on any record of construction drawings. b. The second bullet indicates the use of extrusion welding was approved in addition to the IFC drawing requirement to use fusion welds to connect phased geomembrane panels. Who approved this change and what was the rationale for accepting this change? The certifying engineer approved extrusion welding the Phase 2 geomembrane liner to the Phase 1 geomembrane as this type of connection has been allowed to connect the phased panels throughout the VLF 2 construction. This has been allowed when field conditions are not optimal to complete a fusion weld due to space or curvature constraints. Additionally, extrusion welding is an acceptable liner connection method in the technical specifications outlined in Section 2.2 AA: "Approved field seaming processes are hot shoe double fusion welding and extrusion welding, when approved by CERTIFYING ENGINEER. Use double fusion welding as primary method of seaming adjacent geld panels." Tables: 3. Table 4 — Fill Temperature Monitoring Summary.Average fill temperature was recorded at 32°F on 4123119 at 7:00. Within 3.6 of the Earthworks Technical Specifications, "Frozen" is defined as a mean temperature of thirty-two degrees Fahrenheit(32`F) or less. Please address why SF and SLF placement occurred when rill material was frozen. Fill temperatures on the specified date showing 32°F was reported as whole numbers. Table 4, enclosed, has been revised with precise fill temperature. 4. Table 8 — CQA Earthworks Testing Summary — Drain Cover Fill: Sample Numbers NFDCF-7-R, NFDCF-8-R, and NFDCF-9-R have a Plastic Index greater than 5, therefore are not Non Plastic. Within 2.1 of the Earthworks Technical Specifications, the Plasticity Index for Drain Cover Fill is 0. The Record of Construction Report states, within Section 3.2.4 Drain Cover Fill, that a total of seven DCF samples were tested with passing results. Additionally, as noted in Table 8, Sample Numbers NFDCF-7-R, NFDCF-8-R, and NFDCF-9-R were approved by the Engineer of Record. Within Appendix H.4-Drain Cover Fill Laboratory Test Results, the lab results show these three samples had a Plastic Index