2016-07-12_REVISION - M1985112

• Permit No: M1985112
• IBM Index Class Name: Revision
• Doc Date: 7/12/2016
• Doc Name: Incompleteness Notice
• From: DRMS
• To: Loloff Construction, Inc.
• Type & Sequence: TR2
• Email Name: PSH
• Email Name: WHE
• Media Type: D
• Archive: No

Slurry Wall Design Report
Loloff Pit
5/24/2016
Page i of ii
TABLE OF CONTENTS
1 Introduction............................................................................................................................1
2 Field and Laboratory Investigations.......................................................................................2
2.1 Brierley Investigation ......................................................................................................2
2.1.1 Geotechnical Exploratory Borings...........................................................................2
2.1.2 Laboratory Testing ..................................................................................................2
2.1.3 Packer Testing ........................................................................................................3
2.2 Previous Investigations...................................................................................................4
3 Subsurface Conditions...........................................................................................................5
3.1 Regional Geology...........................................................................................................5
3.2 Summary of Subsurface Materials .................................................................................5
4 Seepage Analysis..................................................................................................................7
5 Backfill Mix Design.................................................................................................................8
5.1 General...........................................................................................................................8
5.2 Backfill Components.......................................................................................................8
5.2.1 Bentonite Slurry.......................................................................................................8
5.3 Backfill Mix Preparation..................................................................................................9
5.4 Backfill Mix Results.........................................................................................................9
6 Slurry Wall Design ...............................................................................................................11
6.1 Slurry Wall Alignment...................................................................................................11
6.2 Slurry Wall Working Platform........................................................................................11
6.3 Slurry Wall Depth and Width ........................................................................................12
6.4 Slurry Wall Key.............................................................................................................12
6.5 Slurry Wall Excavation..................................................................................................12
6.6 XCEL Power Poles.......................................................................................................12
6.7 Construction Water.......................................................................................................13
6.8 Slurry Wall Cap.............................................................................................................13
6.9 Site Reclamation ..........................................................................................................13
6.10 Temporary Excavation Slope Considerations ..............................................................13
6.11 Quality Control Sampling and Testing..........................................................................14
7 Low Permeability Berm and Permanent Embankment Design............................................15
7.1 Quality Control Sampling and Testing..........................................................................15
8 Technical Specifications ......................................................................................................16
9 Limitations............................................................................................................................16
BRIERLEY
ASSOCIATES
Creating Space Underground