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NEWMONT tie AcTic,r,w„ rn.,r3C, i• <br /> Newmont Response: <br /> The "high-effort compaction" backfill zone(upper 35 feet) will be documented by a third-part} engineer <br /> similar to the process approved with the Mill Platform Construction. Further detail is provided in Section <br /> 5.2.7 of the updated Design Report. <br /> DRMS Comment(italics): <br /> 4. Section 4.4, backf. Dran,ing A06 differentiates the PSSA from .Stages.4, B and C. The narrative <br /> indicates placement and backfill in the Schist Island pit meeting specifications for Stages.4 and C, <br /> but does not include the PSSA. Backfill in the PSSA area must also meet specifications. Please <br /> correct this narrative. <br /> Newmont Response: <br /> The construction of the PSSA is included within the construction of Stage A. The text of the Updated <br /> Design Report has been updated to say- Prior to construction of Phase 3, it is envisioned that CC&V will <br /> provide, place, and compact overburden material within the low compaction zone to backfill the Schist <br /> Island Pits for Stage A, including the PSSA, and Stage C utilizing existing mining equipment. Prior to <br /> construction of Phase 3, it is envisioned that CC&V will provide, place, and compact overburden material <br /> within the low compaction zone to backfill the Schist Island Pits for Stage A, including the PSSA, and <br /> Stage C utilizing existing mining equipment. <br /> 1\ <br /> DRMS Comment(italics): <br /> 75. Section 4.4, method specification. The text states CC&V will develop a method specification for <br /> allowable fill materials, lift thickness, and number of passes to achieve compaction prior to <br /> commencement of backfill operations. The Division requires CC&V to commit in writing to submit <br /> a Technical Revision,for the Division's approval. regarding the Compaction .Method Specification <br /> prior to beginning anv backfilling activities in the Schist Island Pits. <br /> Newmont Response: <br /> Please see section 5 2.7 of the updated design report for backfill specifications. <br /> The updated design report is provided in Attachment 13. <br /> DRMS Comment(italics): <br /> -6. Section 4.6-Leak Detection System. This section provides details regarding how the LDS will he <br /> constructed The Division understands LDS trenches are cut into base grading and dire lined with <br /> geomembrane and then topped with the SLF layer. .4lthough previous LDS of'Phase 1 and?ofT'LF2 <br /> have been proposed and approved please clarify how the LDS is intended to detect leaks when base <br /> grading has a higher permeability than SLF and the LDS are fully enclosed. <br /> Newmont Response: <br /> Prior to the installation of the SLF, or any till material, the contractor is required to prepare the subgrade <br /> by scarifying, moisture conditioning, and compacting the subgrade material to 95 percent of the standard <br />