2017-02-21_REVISION - M1988112 ‎(3)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 2/21/2017
• Doc Name: Request for Technical Revision
• From: Battle Mountain Resources, Inc.
• To: DRMS
• Type & Sequence: TR34
• Email Name: WHE
• Media Type: D
• Archive: No

Draft Geotechnical Investigation Report Ms. Deb Miller
San Luis Tailings Impoundment Drop Structure Miller Geotechnical Consultants
TABLE OF CONTENTS
1.0
INTRODUCTION.........................................................................................................1
2.0
FIELD INVESTIGATION............................................................................................2
2.1
Subsurface Conditions Observed in Test Pits...................................................2
2.2
Subsurface Conditions Observed in Soil Borings.............................................3
3.0
LABORATORY
TESTING..........................................................................................4
4.0
GEOTECHNICAL
ANALYSES...................................................................................6
4.1
Slope Stability.....................................................................................................6
4.1.1
Modeling Parameters......................................................................................6
4.1.2
Results for Drop Structure Slope Stability.....................................................7
4.1.3
Results for Conveyance Channel Slope Stability...........................................7
4.1.4
Summary of Stability Results.........................................................................7
4.2
Seepage Analysis................................................................................................8
4.2.1
Modeling Parameters......................................................................................8
4.2.2
Seepage Results...............................................................................................8
4.3
Filter Design.......................................................................................................9
4.4
Pipe Perforation Designs....................................................................................9
4.5
Bearing Capacity................................................................................................9
4.6
Lateral Earth Pressure......................................................................................9
4.7
Resistivity.........................................................................................................10
4.8
Sulfates.............................................................................................................10
5.0
DESIGN CONSIDERATIONS...................................................................................11
5.1
Cut and Fill Slopes...........................................................................................11
5.2
Foundations......................................................................................................11
5.3
Below Grade Walls...........................................................................................12
5.4
Foundation Drains...........................................................................................12
5.5
Corrosion..........................................................................................................12
5.6
Sulfates.............................................................................................................12
5.7
Site Preparation and Fill Placement................................................................12
December 23, 2015 i Engineering Analytics, Inc.
Rev].
—Jan 5, 2016