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 approved by MANAGER and CERTIFYING ENGINEER and will backfill holes with Drain Cover Fill. Areas with deficient thickness shall be reworked by CONTRACTOR, until acceptable measurements are obtained. If MANAGER or CERTIFYING ENGINEER suspects the occurrence of any damage to the underlying geosynthetics, MANAGER will instruct CONTRACTOR to remove Drain Cover Fill to expose the geosynthetics. CONTRACTOR shall uncover, repair any observed damage of the underlying geosynthetics, in accordance with the repair requirements of Sections 02776.0 and 02777.0 of these SPECIFICATIONS and recover, at no cost to CC&V. 10. CONTRACTOR will provide adequate illumination as approved by MANAGER, if Drain Cover Fill placement is carried out at night. A minimum of 2-foot candles measured at the synthetic liner shall be used when Drain Cover Fill placement is carried out at night I. Pipe Bedding Material 1. Pipe bedding material shall be placed around the CSP as shown on the drawings. 2. For piping external to the valley leach facility, CONTRACTOR shall compact the Pipe Bedding Material requiring compaction to at least 95 percent of the maximum dry density as determined by the Standard Proctor density test (ASTM D698), and a moisture content 3 percent below and 3 percent over the optimum moisture content. 3. CONTRACTOR shall place Pipe Bedding Material in maximum 12-inch loose lifts. Pipe Bedding Material will be worked under pipe haunches by hand to provide uniform support of the CSP. 4. Native material used for backfilling CSP excavation shall be placed in 12-inch to 18- inch loose lifts, and compacted by wheel rolling with light, rubber tired or other light compaction equipment, as approved by CERTIFYING ENGINEER. J. Granular Filter Material 1. Granular Filter Material shall be placed beneath the Riprap as shown on the drawings. K. Bedding Fill 1. Bedding Fill shall be placed within the limits of the valley leach facility as shown on the DRAWINGS. 2. CONTRACTOR shall place and compact the Bedding Fill in loose lifts such that the compacted lift thickness is a minimum of 12-inches. CONTRACTOR shall condition the Bedding Fill to allow a surface that does not cause rutting or other deleterious effects. The moisture content and density shall be uniform throughout the lift. If a lift of compacted Bedding Fill dries out during placement operations, CONTRACTOR shall scarify, moisture condition the dry soil and recompact the lift. If a lift of Page 19