2011-11-19_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 11/19/2011
• Doc Name: FINAL REPORT, VOLUME 1 of 3 2011 phase 5 valley leach facility ore storage 1 OF 1
• From: CC&V
• To: DRMS
• Media Type: D
• Archive: No

TABLE OF CONTENTS
AMEC Earth & Environmental, Inc
2000 S Colorado Blvd 2 -1000
Denver, CO 80222
Tel 303 - 935 -6505
Fax 303 - 935 -6575 www.amec corn ii
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1.0 INTRODUCTION 1
1.1 Project Description 1
1.2 Construction Quality Assurance /Construction Quality Control 2
1.2.1 CQA Monitoring of Earthworks 2
1.2.2 CQA/CQC Monitoring of Geosynthetics Installation 4
1.3 Project Coordination 4
1.3.1 Daily Construction Summary Reports 5
1.3.2 Weekly Construction Summary Reports 5
1.4 Project Specifications 5
1.5 Record Survey Documentation 6
1.6 Certification Boundary 6
2.0 SUMMARY OF EARTHWORK CONSTRUCTION 7
2.1 Underground Workings Remediation 8
2.2 Site Grading 9
2.3 Leak Detection System 9
2.4 Subgrade Preparation 10
2.5 Soil Liner Fill 10
2.6 Bedding Fill 11
2.7 2011 Phase 5 VLF OSA 3 Portion Composite Liner System 11
2.8 High Volume Solution Collection System 12
2.9 Drain Cover Fill 13
3.0 GEOSYNTHETICS INSTALLATION 14
3.1 2011 Phase 5 VLF OSA 3 Portion Liner System 14
3.2 Leak Detection Trench 14
4.0 EARTHWORK CQA TESTING AND MONITORING 16
4.1 Results of Laboratory Soils Testing 16
4.1.1 Grain Size Distribution 17
4.1.2 Moisture Content 18
4.1.3 Atterberg Limits 18
4.1.4 Proctor Compaction Tests 19
4.1.5 Permeability Tests 20
4.2 Field Testing and Monitoring 21
4.2.1 Subgrade Preparation 21
4.2.2 Site Grading 21
4.2.3 Soil Liner Fill 22
4.2.3.1 Field Monitoring 22
4.2.3.2 Moisture - Density Test Results 22
4.2.3.3 Depth Verification 23
4.2.4 Bedding Fill 23
4.2.5 Drain Cover Fill 23
4.2.6 Temperature Monitoring 24
4.2.7 Underground Workings 24