REP22489

• Permit No: M1988112
• IBM Index Class Name: Report
• Doc Date: 6/10/1994
• Doc Name: 3RD PART TECHNICAL OVERSIGHT REPORT FOR THE SAN LUIS PROJECT TAILINGS DISPOSAL AREA PHASE II RAISE I
• Media Type: D
• Archive: No

' Third Party Oversight ii Weter, Weste & Lend, Inc.
Sen Luis Mine June 9, 1994
' TABLE OF CONTENTS
1.0 INTRODUCTION .......................................... ...... 1
1.1 BACKGROUND .................................... ...... 1
1.2 PROJECT HISTORY ................................. ...... 1
' 1.3 WORK SCOPE ..................................... ...... 2
1.3.1 Task 1 -- Familiarization with Approved Plan 2
1.3.2 Task 2 -- Field Construction Oversight ............... ...... 2
1.3.3 Task 3 -- Oversight of Field Testing Program .... . 3
' 1.3.4 Task 4 -- Review of Related Technical Submittals
::::: :: ::::
3
1.3.5 Task 5 -- Review of Final Construction Certifications ....... ..... 3
t
1
4 1.3.6 Task 6 -- Participation in Meetings with BMRI ...........
SCOPE OF REPORT ..... 3
3
.
2.0 REVIEW OF DESIGN AND GEOTECHNICAL ISSUES ................ .......
2.1 INITIAL DESIGN REVIEW ............. 4
4
2.2 DESIGN INTENT ......................................... . 4
2.3 GEOTECHNICAL ISSUES ASSOCIATED WITH THE RAISE I EXPANSION ... 5
2.4 TECHNICAL SUBMITTALS .................................. . 8
3.0 CONSTRUCTION OVERSIGHT AND QUALITY ASSURANCE TESTING ............ 9
' 3.1 CONSTRUCTION OVERSIGHT ...............................
3.2 QUALITY ASSURANCE TESTING ...................... ...... . 9
. 9
4.0 RAISEIEMBANKMENT .................'.....•.......'... .....
4.1 MATERIALS SPECIFICATIONS 11
11
4.2 INITIAL CONSTRUCTION .................................. 13
' 4.3 TECHNICAL ISSUES ....:::::::::::::::::::::::::::.:::::.
4.4 FINAL CONSTRUCTION 13
13
5.0 DRAINAGE LAYER .............................................. 15
' 5.1 DESIGN ISSUES ......................................... 15
5.2 MATERIAL PLACEMENT ............................ ...... 15
5.3 PERMEABILITIES ........................................ 16
5.4 FINAL CONSTRUCTION AND TESTING .....
.......
........... 18
5.5 DRAINAGE PIPE SPACING .........
:
: 19
' 6.0 LINER SYSTEM ...............................................
6.1 LOW-PERMEABILITY LAYER 20
20
6.2 SYNTHETIC LINER ................................ ...... 20
' 7.0 REFERENCES ................................................. 22
' APPENDICES
A -- ENGINEER'S DAILY FIELD LOGS
' B -- WEEKLY CONSTRUCTION ACTIVITY UPDATE REPORTS