2020-07-08_REVISION - M1980244 (21)

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Newmont-Cripple Creek&Victor Gold Mine Technical Specification No.02200 REV D ■ Squaw Gulch VLF Project No.475.0106.006 March 13,2020 G. Soil Liner Fill 1. Soil Liner Fill shall be placed within the limits of the valley leach facility as shown on the DRAWINGS and shall begin only after completion of all, or MANAGER and CERTIFYING ENGINEER approved portion of,excavation and Structural Fill placement in the valley leach facility. 2. CONTRACTOR shall process, place and compact the Soil Liner Fill to achieve a coefficient of permeability of less than 1x10-6cm/sec, measured according to ASTM Method D5084, Method D. Any Soil Liner Fill not meeting the permeability specification shall be removed and replaced with material meeting the permeability specification, at no additional cost to CC&V. 3. CONTRACTOR shall place and compact the Soil Liner Fill in loose lifts such that the compacted lift thickness is a minimum of 12-inches. 4. CONTRACTOR shall compact the Soil Liner Fill to at least 95 percent of the maximum dry density as determined by the Standard Proctor density test (ASTM D698). The moisture content shall be within +3%to-2%of the optimum moisture content. Both moisture and density shall be uniform throughout the lift. If the Soil Liner Fill cannot be conditioned to meet the placement specifications, the material shall be removed and replaced with new Soil Liner Fill at the CONTRACTOR's expense. The CONTRACTOR shall reduce the clod size of the soil liner fill to a size that is acceptable to the CERTIFYING ENGINEER,the method by which will be approved by CERTIFYING ENGINEER and MANAGER prior to implementation. 5. The moisture content of the Soil Liner Fill shall be uniform throughout prior to and during compaction of the material. CONTRACTOR shall be responsible for meeting moisture content and compaction SPECIFICATIONS. If the Soil Liner Fill cannot be conditioned to meet the placement SPECIFICATIONS, the material shall be removed and replaced with new Soil Liner Fill at no additional cost to CC&V. MANAGER may require CONTRACTOR to moisture condition Soil Liner Fill at stockpile at least 24 hours prior to the Soil Liner Fill being placed. 6. CONTRACTOR shall place Soil Liner Fill to form a continuous monolithic material. If a lift of compacted Soil Liner Fill dries out during placement operations, CONTRACTOR shall scarify, moisture condition the dry soil and recompact the lift. If a lift of compacted Soil Liner Fill becomes overly wet due to precipitation or over watering, CONTRACTOR shall allow the wet soil to dry to the specified moisture content range before recompaction of fill and placement of geosynthetic materials. 7. CONTRACTOR shall assist CQA Monitor in obtaining soil samples for CQA testing. Soil Liner Fill sampling shall be scheduled by CQA Monitor with CONTRACTOR to facilitate CQA field testing. 8. CONTRACTOR shall maintain Soil Liner Fill stockpile areas in a free-draining condition. The CONTRACTOR will maintain Soil Liner Fill stockpiles and Soil Liner Fill Page 15