REP48449

• Permit No: M1988112
• IBM Index Class Name: Report
• Doc Date: 1/31/1994
• Doc Name: THIRD PARTY TECHNICAL OVERSIGHT REPORT FOR THE SAN LUIS PROJECT TAILINGS DISPOSAL AREA PHASE II RAIS
• Media Type: D
• Archive: No

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Third Party Oversight iii Water, Waste & Land, Inc.
San Luis Mine January 10, 1993
TABLE OF CONTENTS
1.0 INTRODUCTION ................................ ................ 1
1.1 BACKGROUND ........................... ............... 1
1.2 PROJECT HISTORY ........................ ....... ....... 1
1.3 WORK SCOPE ............................ ............... 2
1.4 SCOPE OF REPORT ........................ ....... ....... 3
2.0 REVIEW OF DESIGN AND GEOTECHNICAL ISSUES ......... ............... 4
2.1 DESIGN REVIEW .......................... ....... ....... 4
2.2 DESIGN INTENT ........................... ............... 4
2.3 GEOTECHNICAL ISSUES WITH RAISE I EXPANSION .. ............... 5
2.4 TECHNICAL SUBMITTALS .................... ............... 8
3.0 RAISEIEMBANKMENT .• ........................... ....... ....... 9
3.1 MATERIALS SPECIFICATIONS ................. ............... 9
3.2 INITIAL CONSTRUCTION .................... .............. 11
3.3 TECHNICAL ISSUES ........................ .............. 11
3.4 FINAL CONSTRUCTION ..................... .............. 12
4.0 DRAINAGE LAYER ............................... ........ ...... 13
4.1 DESIGN ISSUES ........................... ....... ...... 13
4.2 MATERIAL PLACEMENT ..................... .............. 13
4.3 PERMEABILITIES .......................... ....... ...... 14
4.4 FINAL CONSTRUCTION AND TESTING ........... .............. 15
4.5 DRAINAGE PIPE SPACING .................... .............. 17
5.0 LINER SYSTEM ................................. ............... 18
5.1 LOW-PERMEABILITY LAYER .................. .............. 18
5.2 SYNTHETIC LINER ......................... .............. 18
6.0 CONSTRUCTION OVERSIGHT AND QA TESTING ........... .............. 19
6.1 CONSTRUCTION OVERSIGHT ................. .............. 19
6.2 QUALITY ASSURANCE TESTING ............... .............. 19
7.0 REFERENCES ................................................. 21
APPENDIX A -ENGINEER'S DAILY FIELD LOGS
APPENDIX B -WEEKLY CONSTRUCTION ACTIVITY UPDATE REPORTS