2016-10-21_REPORT - M1980244 (31)

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Cripple Creek & Victor Gold Mining Company Squaw Gulch VLF Phase 1 Completion Record of Construction Report 475.0106.006 October 14, 2016 P:\Projects\0106.006 CC&V CQA and EDS\J‐REPORTS\ROC Report\475.0106.006 CCV PHASE 1 ROC REPORT ‐ FINAL161014.DOCX Page 4 CC&V. All cleared areas were inspected by the CQA Monitor to ensure that all deleterious material was removed prior to further construction activities. 2.2. Underground Working Remediation All underground workings within the Phase 1 Squaw Gulch VLF project limits were previously remediated. The details of the remediation were reported in the “Squaw Gulch VLF Phase 1 (9,450’ to 9,550’ Bench) Record of Construction Report,” submitted by Amec in November 2015. 2.3. Underdrains The Phase 1 Squaw Gulch VLF was designed with an underdrain system consisting of primary, secondary and tertiary underdrains. The as built layout of the underdrain system is shown on Record Drawing No. 3. The typical underdrain details shown on IFC Drawing A250 present the minimum cross sectional area required for each of the underdrain types. 2.3.1. Primary and Tertiary Underdrain No primary or tertiary underdrain was constructed within the limits of construction presented in this report. The underdrains constructed during the Squaw Gulch VLF Phase 1 Completion were tied into previously installed underdrains. The details of the previous underdrain installation were reported in the “Squaw Gulch VLF Phase 1 (9,450’ to 9,550’ Bench) Record of Construction Report,” submitted by Amec in November 2015. 2.3.2. Secondary Underdrain Approximately 850 linear feet of secondary underdrain was constructed within the limits of the Squaw Gulch VLF Phase 1 Completion area. The secondary underdrain trench was excavated to the minimum dimensions shown on IFC Drawing A250. Geotextile and Underdrain Fill (UF) were then placed in the trench, and a minimum of 6 inches of Select Structural Fill (SSF) was placed over the geotextile. Approximately 11,910 square feet of 12oz/yd2 non‐woven geotextile, 252 cubic yards (cy) of UF and 63 cy of SSF were installed when constructing the secondary underdrains. The CQA Monitor verified that all secondary underdrains were installed in accordance with the project technical specifications. 2.4. Site Grading Approximately 1,955,187 cy of Structural Fill (SF) material was used to grade the site according the design drawings. Prior to SF placement, the existing subgrade was scarified to a depth of 6 inches. The SF was then placed in 2‐foot loose lifts, moisture conditioned as required, and compacted using a 10‐ton smooth drum vibratory compactor. The entire surface of each lift was compacted with a minimum of four passes in accordance with the developed method