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Newmont Mining Corporation <br /> Record of Construction Report ■ <br /> VLF2 Recertification Project <br /> Subgrade and Geomembrane 9650'—9750'Elevations <br /> NewFields Project No.475.0106.026 <br /> July 3,2018 <br /> and the test was considered "passing." If a pressure drop of more than 3 psi occurred or the <br /> continuity was not proven, smaller sections of the seam were tested to delineate the failing <br /> section of the seam.All failing seams or portions of seams were repaired and vacuum tested.The <br /> Geomembrane Seam Pressure Testing Summary is presented in Appendix E.B. <br /> 5.1.7. Geomembrane Defects and Repairs <br /> The CQA Monitor constantly inspected the geomembrane for defects from the time it was <br /> deployed to DCF placement. All defects were marked with a defect number by the CQA Monitor <br /> and repaired. Repairs were performed using the extrusion welding method and patches extended <br /> at least 6-inches past the defect in all directions. All repairs were assigned a repair number and <br /> cross checked with defect numbers to ensure all defects were repaired. <br /> All repairs and extrusion welded seams were non-destructively tested using a vacuum box. The <br /> area being tested was covered in soapy water and the vacuum box was sealed to the <br /> geomembrane.A vacuum was pulled over the area for at least 10 seconds and if no bubbles were <br /> present the test passed. If bubbles were present the area failed and was marked as a defect.The <br /> repair process would then be repeated for the failing vacuum test.Vacuum tests overlapped each <br /> other by a minimum of 3-inches. The Geomembrane Defect/Repair Summary, including vacuum <br /> testing logs, is presented in Appendix E.9. <br /> 5.1.8. Geomembrane Acceptance <br /> Prior to DCF placement, the geomembrane was accepted by Comanco, Ames, CC&V and <br /> NewFields. All CQA logs and survey data were thoroughly reviewed ensuring that all aspects of <br /> the geomembrane installation were performed in accordance with the Technical Specifications. <br /> Geomembrane Acceptance Forms are presented in Appendix E.10. <br /> 6. CONCLUSION <br /> Based on a review of the construction documents,the daily observation reports,our professional <br /> judgment, and the quality control and assurance testing, it is our opinion that the construction <br /> activities associated with the Geomembrane Recertification for Subgrade and Geomembrane <br /> Between the 9650' and 9750' elevations were completed in conformance with the approved <br /> Technical Specifications. Upon DCF placement, an additional certification report will be <br /> generated certifying that element of construction. <br /> Page 11 <br />