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Cripple Creek&Victor Gold Mining Company Squaw Gulch VLF Phase 2A Part 1 ■ Record of Construction Report 475.0106.032 July 22,2019 slope existed, two smooth drum compactors mounted in tandem with a dozer were used to compact the subgrade. The contractor also utilized a smooth drum compactor attachment mounted on an excavator on slopes where the two compactors and dozer configuration could not be used. Compaction of the subgrade was performed in accordance with the applicable developed method specifications, presented in Appendix E, for the following equipment: ➢ Vibratory smooth drum compactor; ➢ Excavator smooth drum roller attachment; and ➢ Vibratory sheepsfoot drum compactor. The CQA Monitor inspected and approved the finished subgrade surface prior to SLF placement. 2.6. Leak Detection Trench Approximately 2,995 linear feet of leak detection trench was constructed within the Squaw Gulch VLF Phase 2A limits in accordance with the project Technical Specifications. The Phase 2A leak detection trench has only been partially constructed, as shown on Record Drawing No. 4. The leak detection trenches installed prior to March 2019 have been inspected and repaired, as needed, prior to the acceptance of the subgrade. The remainder of the leak detection trench to be constructed, as well as the leak detection sumps, will be completed during future construction. Detail N on IFC Drawing A68 shows the typical leak detection trench section. Per Detail N, a minimum one foot by one foot trench was excavated and lined with 40 mil smooth LLDPE geomembrane. The geomembrane was installed in long strips with a 5-foot overlap and was overlain by a 12 oz/ydZ non-woven geotextile. A 4-inch diameter perforated corrugated polyethylene pipe (CPeP) was then placed in the trench. The trench was backfilled with Leak Detection Fill (LDF) and the geotextile was wrapped around the fill with a minimum 1-foot overlap. A minimum slope of 0.5 percent was maintained along the entire length of the trench. Where necessary, portions of the leak detection trench (constructed prior to March, 2019), geotextile was replaced within it. The CQA Monitor observed all leak detection trench installation to date. The Squaw Gulch VLF Phase 2A leak detection trench was constructed by installing approximately 14,975 square feet of 40 mil smooth LLDPE geomembrane, 14,975 square feet of 12 oz/ydZ non-woven geotextile, 2,995 linear feet of 4-inch CPeP and 111 cy of LDF. P:\Projects\0106.032 VLF2 Phase 2 CQA\J-REPORTS\ROC Report 1\Cert Report-Phase 2A Part 1\475.0106.032 CCV PHASE 2A Part 1 ROC REPORT.docx Page 6