20170608_COMPLETE_SHEET_SET_Signed.pdf

BEAL MOUNTAIN MINE

2017 BARREN POND & LEACH PAD CORRIDOR CLOSURE

SUMMARY OF SCHEDULE OF ITEMS

www.tetratech.com

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

SCHEDULE OF ITEMS

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

FAIRMONT HOT

SPRINGS RESORT

BEAL MOUNTAIN

MINE

PRIVATE ACCESS ROAD

FSR 83 PRIMARY

ACCESS ROAD

I-15

FAIRMONT ROAD

INSET A

BEEFSTRAIGHT

CREEK

GERMAN GULCH

ROAD

MINNESOTA

POND AREA

BARREN POND

AREA

CONTINGENCY

POND AREA

EMERGENCY

SPILLWAY

POND AREA

LEACH PAD

AREA

GERMAN GULCH

ROAD

EXISTING

WATER TREATMENT

PLANT

BORROW

AREA

FRESH WATER

POND

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

SITE OVERVIEW

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

2500' 5000'

1"=5000'

N

SCALE:

750' 1500'

1"=1500

N

INSET A

WORK AREA E,

SEE SHEET C6, C6A & C7

WORK AREAS C & D,

SEE SHEETS C4 & C5

WORK AREA B, SEE SHEET C2

WORK AREA B, SEE SHEET C2 & C3

RECLAMATION,

SEE SHEET C10

BORROW AREA DEVELOPMENT

& RECLAMATION

MINNESOTA POND AREA

REMOVE & SALVAGE FENCE

MATERIAL, SEE SHEET C9

STORMWATER POND AREA

REMOVE & SALVAGE FENCE MATERIAL,

SEE SHEET C9

CONTINGENCY POND AREA

REMOVE & SALVAGE FENCE

MATERIAL, SEE SHEET C9

SUMP 1 PIPE DRAIN FIXTURE,

SEE DETAIL A, SHEET D1

WORK AREA F, STAGING & SPENT

ORE CONTAINMENT PAD AREA,

SEE SHEET C8

COARSE GRAINED

MATERIAL STOCKPILE

FRESH WATER POND

SEE SHEET G3

SALVAGED PIPE MATERIAL STOCKPILE AREA

WORK AREA A, SEE SHEET C1

WORK AREA G, SEE SHEET C8

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK OVERVIEW

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

375' 750'

1"=750' x

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F O x x x x x x x x

EXISTING BEAL R.O. WATER

TREATMENT PLANT

OVERHEAD

POWER POLE

OVERHEAD POWER

PRESERVE AND PROTECT

EXISTING 6-INCH DIA BEAL

R.O. WATER TREATMENT

PLANT REJECT PIPELINE

(DASHED ABOVE GROUND)

EXISTING BARREN POND

DRAIN PIPE

CATTLE GUARD

10-INCH DIA ACTIVE

BEAL R. O. PIPE

EXISTING 6-INCH DIA

BEAL R.O. WATER TREATMENT

PLANT REJECT PIPELINE

EXISTING POWER POLE

PRESERVE & PROTECT

MONITORING WELLS

PRESERVE & PROTECT

MONITORING WELL

PRESERVE & PROTECT

SHALLOW BURY BEAL

R.O. TREATMENT PLANT

FIBER OPTIC LINE

THRUST BLOCKS

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EXISTING 10-INCH DIA

HDPE PROCESS PIPES

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING BUILDING OR STRUCTURE FOOTPRINT

EXISTING SHRUBBERY OR TREE

EXISTING EDGE OF ROAD (UNPAVED)

EXISTING BEAL R.O. FIBER OPTIC LINEEXISTING OVERHEAD UTILITY FO

x

OE

LEGEND

EXISTING FRENCH DRAIN

EXISTING BEAL R.O. ACTIVE PIPELINE

EXISTING HDPE PIPELINE

EXISTING BEAL R.O. REJECT PIPELINE

EXISTING SURFACE WATER DIVERSION CHANNEL

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

EXISTING CONDITIONS - BARREN POND

& LEACH PAD WORK AREAS

Helena, Montana 59601

PHONE: 406-443-5210 FAX: 406-4493729

MAY '17

N

SCALE:

25' 50'

FEET

O

E

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F

O

F

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F

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F

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F

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EXISTING BEAL R.O.

WATER TREATMENT

PLANT

CONNECT TO

EXISTING 4-INCH

HDPE PIPE

OVERHEAD

ELECTRIC

EXISTING POWER

POLE

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EXISTING 6-INCH DIA BEAL R.O.

WATER TREATMENT PLANT

REJECT PIPELINE (ABOVE GROUND)

PRESERVE & PROTECT

MONITORING WELL

PRESERVE & PROTECT 6-INCH DIA

HDPE VERTICAL CLEANOUT FIXTURE

A

C

B

C

0+00 1+00 2+00 3+003+24

0+00 1+00 2+00 3+003+24

0+00 1+00 2+00 3+003+30

0+00 1+00 2+00 3+003+30

BARREN POND

C2

BARREN PONDB

C2

PROPOSED FINAL

GRADE, SEE SHEET C3

EXISTING

DRAIN PIPE

CONNECT TO

EXISTING 4-INCH

HDPE DRAIN PIPE

(INV. ELEV. ~7541.12)

PROPOSED

FRENCH DRAIN

SEE DETAIL

EXISTING

GROUND

PROPOSED FINAL

GRADE, SEE SHEET C3

PROPOSED

FRENCH DRAIN,

SEE DETAIL

INVERT ELEV.

~7543.18'

INVERT ELEV.

~7543.00'

CONNECT TO NORTH-

SOUTH PIPE, INV.

ELEV. ~7541.83

D1

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING EDGE OF ROAD (UNPAVED)

EXISTING BEAL R.O. FIBER OPTIC LINE

EXISTING OVERHEAD UTILITY

FOx

OE

LEGEND

EXISTING R.O. REJECT PLANT PIPELINE

EXISTING SURFACE WATER DIVERSION CHANNEL

EXISTING BUILDING OR STRUCTURE FOOTPRINT

EXISTING SHRUBBERY OR TREE

EXISTING FRENCH DRAIN

EXISTING HDPE PIPE

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK AREA B PLAN AND SECTIONS

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

25' 50' x x

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PRESERVE & PROTECT EXISTING

6-INCH DIA BEAL R.O.

WATER TREATMENT PLANT

REJECT PIPELINE (ABOVE GROUND)

F

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PROTECT & PRESERVE

MONITORING WELL

PRESERVE & PROTECT FIBER OPTIC

CABLE (APPROXIMATE LOCATION)

BARREN POND BACKFILL

FINAL GRADING EXTENTS

PRESERVE & PROTECT

6-INCH DIA HDPE VERTICAL

CLEANOUT FIXTURE

PROPOSED GROUND MAJOR CONTOUR

PROPOSED GROUND MINOR CONTOUR

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING EDGE OF ROAD (UNPAVED)

EXISTING OVERHEAD UTILITY

FO

x

OE

LEGEND

EXISTING SURFACE WATER DIVERSION CHANNEL

EXISTING BEAL R.O. FIBER OPTIC LINE

EXISTING R.O. REJECT PLANT PIPELINE

EXISTING BUILDING OR STRUCTURE FOOTPRINT

EXISTING SHRUBBERY OR TREE

EXISTING FRENCH DRAIN

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

BARREN POND FINAL GRADING

WORK AREAS A, B, & C

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

25' 50'

1" = 50'

F O

F O

F

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WORK

AREA B

EXISTING BARREN POND DRAIN PIPE

SURFACE WATER

DIVERSION CHANNEL

WORK

AREA C

PRESERVE & PROTECT

6-INCH DIA HDPE VERTICAL

CLEANOUT FIXTURE

ESTIMATED TERMINATION

OF 3-10-INCH DIA PIPES

CUT AND RECONNECT 10-INCH

DIA ACTIVE BEAL R.O.

PIPE, THIS LOCATION

REMOVE & SALVAGE

10-INCH DIA ACTIVE BEAL R.O. PIPE

PRESERVE & PROTECT

MONITORING WELL

CUT 10-INCH DIA ACTIVE BEAL R.O. PIPE AT 90° ELBOW,

REMOVE & DISPOSE OF THRUST BLOCK

REMOVE & SALVAGE 10" HDPE ENCASED

IN 12" CORRUGATED = 1,118 LF

REMOVE & SALVAGE 10" HDPE = 255 LF

(NOT ENCASED IN 12" CORRUGATED PIPE)

INSTALL SALVAGED 10" HDPE = 31 LF

PRESERVE & PROTECT EXISTING 6" HDPE

(DASHED ABOVE GROUND)

PRESERVE & PROTECT EXISTING 10" DIA

ACTIVE BEAL R.O. PIPE

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING BUILDING OR STRUCTURE FOOTPRINT

EXISTING SHRUBBERY OR TREE

EXISTING EDGE OF ROAD (UNPAVED)

FO

x

LEGEND

EXISTING SURFACE WATER DIVERSION CHANNEL

EXISTING BEAL R.O. FIBER OPTIC LINE

EXISTING FRENCH DRAIN

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK AREA C PLAN

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

15' 30'

PROTECT & PRESERVE

10-INCH DIA ACTIVE BEAL R.O.

PIPE

EXISTING HORIZONTAL DRAIN

8-INCH DIA CENTER LINE

(FRENCH DRAIN)

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A

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WORK

AREA D

WORK

AREA E

EXISTING 6-INCH DIA

BEAL R.O. WATER TREATEMENT

PLANT REJECT PIPELINE

(DASHED ABOVE GROUND)

8-INCH DIA HDPE

PERFORATED PIPE

CORRIDOR DRAINS

B

C

EDGE OF ACCESS ROAD

INSTALL 22.5° WYE AT STA 1+07 & CONN

ECT NEW

8-INCH DIA PROCESS PIPE CORRIDOR HORIZONTAL DRAIN

INSTALL 107 LF NEW 8-INCH DIA HDPE

PERFORATED PIPE CORRIDOR MAIN HORIZONTAL

DRAIN STA 0+00, PER DETAIL

VERTICAL DRAIN ROCK CORRIDOR

SEE DETAIL

CUT EXISTING 8-INCH DIA HORIZONTAL

DRAIN AND TEST EXISTING DRAIN IN

ACCORDANCE WITH SECTION 607

D4

0+000+501+001+15

0+000+501+001+15

EXISTING 10-INCH DIA PROCESS

PIPES (3) TO BE REMOVED & SALVAGED

INSTALL 107 LF 8-INCH DIA

MAIN HORIZONTAL DRAIN,

INVERT ELEV. 7551.75',

PER DETAIL

CONNECT NEW 8-INCH DIA PROCESS PIPE CORRIDOR

HORIZONTAL DRAIN TO EXISTING 8" DIA HORIZONTAL

DRAIN PIPE, INVERT ELEV. 7545.50'

SECTION VIEW OF HORIZONTAL

PROCESS DRAIN PIPE INSTALLATION

B

C3

PROTECT & PRESERVE

10-INCH DIA ACTIVE

BEAL R.O. PIPE

LEGEND

8-INCH DIA PROCESS PIPE

CORRIDOR SECONDARY

HORIZONTAL DRAIN PIPES

SHALL MATCH MAIN PIPE GRADE

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING EDGE OF ROAD (UNPAVED)

REMOVE & SALVAGE 10" HDPE ENCASED IN 12" ADS = 674 LF

EXISTING SURFACE WATER DIVERSION CHANNEL

WITH 4" PERFORATED PIPE

REMOVE & SALVAGE 10" HDPE

INSTALL SALVAGED 10" HDPE

PRESERVE & PROTECT EXISTING 6" HDPE

PRESERVE & PROTECT EXISTING 10" HDPE

8" ABANDONED PIPE CORRIDOR HORIZONTAL DRAIN

EXISTING FRENCH DRAIN

DRAIN ROCK (NOT SHOWN)

SEE DETAIL

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T e t r a

T e c h

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

BEAL MOUNTAIN MINE

WORK AREA D PLAN AND SECTION

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

12.5' 25' www.tetratech.com

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK AREA E PLAN

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

15' 30'

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

3-D RENDERING OF WORK AREA E

LEACH PAD PENETRATIONS

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

3-FOOT BENCH FOR GCL LINER REPAIR

APPROXIMATE LOCATION OF

PROCESS PIPE PENETRATIONS

3 - 10-INCH DIA PROCESS PIPES

TO BE REMOVED & SALVAGED

PROTECT & PRESERVE

10-INCH DIA ACTIVE BEAL

R.O. PIPE

BOTTOM OF EXCAVATION

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK AREA E

CROSS SECTION

303 Irene Street

Helena, Montana 59601

LEGEND

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING EDGE OF ROAD (UNPAVED)

EXISTING SURFACE WATER DIVERSION CHANNEL

EXISTING BEAL R.O. REJECT PLANT PIPELINE

EXISTING SHRUBBERY OR TREE

x

SUMP 1 PIPE DRAIN FIXTURE,

SEE DETAIL A, SHEET D1

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

WORK AREAS F & G

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

50' 100'

1" = 100'

N

SCALE:

100' 200'

1" = 200' x x x x x x x x x x x x x x x x x x x x x x x x

REMOVE AND SALVAGE METAL

AND WOOD FENCE POSTS AND

BRACE RAILS

REMOVE AND SALVAGE METAL GATE

APPROXIMATE

FENCE LOCATION

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A x x x x x x x x x x x

G

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APPROXIMATE

FENCE LOCATION

REMOVE AND SALVAGE

METAL AND WOOD FENCE

POSTS AND BRACE RAILS

REMOVE AND SALVAGE

METAL GATE

x x x x x x x x x x x x x

G

E

R

M

L

A

D

REMOVE AND SALVAGE METAL

AND WOOD FENCE POSTS AND

BRACE RAILS

APPROXIMATE FENCE

LOCATION

REMOVE AND SALVAGE

METAL GATE

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C o p y r i g h t

T e t r a

T e c h

BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

FENCE REMOVAL PLAN

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

25' 50'

1" = 50'

SCALE:

37.5' 75'

1" = 75'_XREF

SCALE:

37.5' 75'

1" = 75'_XREF

N N N

MINNESOTA POND AREA EMERGENCY SPILLWAY

POND AREA

CONTINGENCY POND

AREA

x x

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INSTALL 563 LF OF FENCE

INSTALL SALVAGED

METAL GATE

BEAL R.O. WATER

TREATMENT PLANT

PRESERVE & PROTECT

MONITORING WELL

INSTALL FENCE

GROUNDING

PRESERVE & PROTECT

SHALLOW BURY

FIBER OPTIC LINE

EXISTING ACCESS ROAD

LEGEND

EXISTING GROUND MAJOR CONTOUR

EXISTING GROUND MINOR CONTOUR

EXISTING FENCE

EXISTING OVERHEAD UTILITY

EXISTING EDGE OF ROAD (UNPAVED)

EXISTING R.O. REJECT PLANT PIPELINE

EXISTING SURFACE WATER DIVERSION CHANNEL

EXISTING BEAL R.O. FIBER OPTIC LINE

EXISTING BUILDING OR STRUCTURE FOOTPRINT

EXISTING SHRUBBERY OR TREE

x

OE

FO

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

BARREN POND AREA

RECLAMATION PLAN

303 Irene Street

Helena, Montana 59601

PHONE: (406) 443-5210 FAX: (406) 449-3729

MAY '17

SCALE:

50' 100'

1" = 100'

TO R.O.

24-INCHES

2 FT MIN.

SUMP 1 -PIPE DRAIN FIXTURE DETAIL

NTS

BARREN POND HORIZONTAL DRAIN DETAIL

PIPE CORRIDOR HORIZONTAL DRAIN DETAIL

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24-INCHES

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CLEAN AND DRY

18" MIN 6"

NON-SHRINK GROUT

THOROUGHLY PACKED

TEMPORARY FOAM

OR PIPE PLUG

EXISTING PIPELINE TO BE

PLUGGED AND ABANDONED

TYPICAL PIPE PLUG

E

INSTALL HDPE ELCTROFUSION

6-INCH x 2-INCH SADDLE

EXISTING BUTTERFLY

SHUT OFF VALVE

EXISTING SUMP #1 CASING

BARREN POND

BACKFILL

TYPE I-B GEOTEXTILE

FABRIC WITH 6-INCH

OVERLAP (MIN.)

PROPOSED HORIZONTAL 4-INCH

HDPE PERFORATED PIPE

EXISTING GROUND

TYPE I-B GEOTEXTILE

FABRIC WITH 6-INCH

OVERLAP (MIN.)

PROPOSED HORIZONTAL

8-INCH HDPE CORRUGATED

PERFORATED PIPE

SEE DETAIL G, SHEET D2

EXISTING 6-INCH HDPE

ACTIVE BEAL R.O. PIPE

EXISTING

GROUND

EXISTING GROUND

2-INCH MALE

QD FITTING

2-INCH METAL BALL

VALVE

2-INCH STEEL NIPPLE

2-INCH STEEL FLANGE

2-INCH HDPE PIPE

2-INCH 90° ELBOW

2-INCH HDPE PIPE

2-INCH STEEL NIPPLE

2-INCH HDPE FLANGE

DRAIN ROCK BEDDING

DRAIN ROCK BEDDING

10" AIR PURGE FIXTURE & 6" DRAIN PIPE DETAIL

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48-INCH CORRUGATED PIPE WITH COVER

LEACH PAD

BOTTOM LINER

10-INCH HDPE

R.O. PROCESS PIPE

SALVAGED 10-INCH HDPE

PIPE, SEE SHEET C5, C6

INSTALL 10-INCH AIR

PURGE FIXTURE

LEACH PAD

TOP LINER

PLACE 4-INCHES OF BENTONITE

EACH SIDE OF LEACH

PAD TOP LINER

AIR PURGE VALVE,

PER SPECIFICATIONS

INSTALL 6-INCH DIA HDPE AIR

PURGE FIXTURE DRAIN PIPE

PLACE 4-INCHES OF

BENTONITE

EACH SIDE OF LEACH

PAD TOP LINER

PLACE & COMPACT

12-INCHES GOVERNMENT

PROVIDED BENTONITE

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

MISCELLANEOUS

DETAILS

303 Irene Street

Helena, Montana 59601

CLEANOUT PIPE DETAIL

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BEAL BARREN POND HORIZONTAL DRAIN

PIPE PERFORATION DETAIL

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30-INCHES

10-INCH HDPE PIPE DETAIL

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LEACH PAD BOTTOM LINER REPAIR (TYP)

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120.000°'

FOLD BACK LINER TO

REMOVE & SALVAGE

HDPE PIPES

SECTION VIEW POST EXCAVATION

SECTION VIEW POST PIPE REMOVAL & LINER PATCHING

FOLD EXISTING LINER

BACK TOGETHER

BEFORE PATCHING

EXISTING STEEL BLIND

FLANGE & BOLTS

EXISTING HDPE FLANGE

SALVAGED 10-INCH

VERTICAL CLEANOUT PIPE

MAX. DIA

MIN. DIA

ALL PERFORATIONS

@ 3-INCHES MAX

SPACING BOTH ROWS

TRENCH BACKFILL

EXISTING GROUND

EXISTING GROUND

HDPE PIPE

BEDDING MATERIAL

RELOCATED 10-INCH HDPE

ACTIVE BEAL R.O. PIPE

EXISTING GROUND

TOP EDGE OF EXISTING

LEACH PAD BOTTOM LINER

CUT LINER TO CENTER OF

PIPE PENETRATION

EXISTING PIPE PENETRATION OF

LEACH PAD BOTTOM LINER

NEW LINER SHINGLE

INSTALLED PER

MANUFACTURERS

SPECIFICATIONS

THERMAL FUSION ALL

THREE EDGES OF NEW

LINER SHINGLE

REMOVE & SALVAGE 10-INCH

HDPE PIPES

REMOVED PROCESS PIPES

EXPOSED LINER FACE

OF LEACH PAD BOTTOM

LINER FOLLOWING

EXCAVATION

BEAL R.O. PROCESS

PIPE

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

MISCELLANEOUS

DETAILS

303 Irene Street

Helena, Montana 59601

6" KEY TRENCH

SEE DETAIL

2' MIN.

TURF REINFORCEMENT MAT

1'-6"

REPAIRED 4-INCH DIA ADS N-12 HDPE

PERFORATED PIPE w/ 9" FILTER GRAVEL

SURROUNDING

CONTINUOUS GCL

WITH GEOCOMPOSITE

DRAIN LAYER IN BEAL

LEACH PAD AREA

8.00'

M

D3

6" KEY TRENCH

SURFACE WATER DIVERSION CHANNEL TYP.

J

INSTALL TYPE I-B

GEOTEXTILE FABRIC

SALVAGED COVER

SOIL/TOPSOIL

COMPACTED SPENT

ORE BACKFILL

LAYER OF GCL

1'

GEOCOMPOSITE DRAIN

LAYER OVER REINSTALLED

LAYER OF GCL

TOP LINER REPAIR OVERLAP AND KEY TRENCH

L

VARIES

GEOCOMPOSITE DRAIN

- 4-INCH OVERLAP (MIN)

LAY MIN. 1.5' (3' PREFERED) OF

EXISTING GCL OVER REINSTALLED

LAYER OF GCL

GRANULAR BENTONITE,

LB

PER LINEAR FOOT

EXCAVATION LIMIT

EXCAVATION

LIMIT

15'

3'

3' 3'

3'

3'

TURF REINFORCEMENT MAT STAPLE DETAIL

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TURF REINFORCEMENT MAT

TURF REINFORCEMENT MAT

STAPLES

TURF REINFORCEMENT MAT OVERLAP DETAIL

N

TURF

REINFORCEMENT

MAT

6"

GCL\GEO-

COMPOSITE

COVER-SOIL

BACKFILL

COVER-SOIL

BACKFILL

TURF REINFORCEMENT MAT KEY TRENCH

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

SURFACE WATER DIVERSION CHANNEL

& LINER REPAIR DETAILS

303 Irene Street

Helena, Montana 59601

SPENT ORE CONTAINMENT PAD SECTION DETAIL

S

2.00' 2.00'

2'

1'

3'

1'

KEY TRENCH

ALL SIDES OF LINER

EAST

WEST SPENT ORE

STOCKPILE

6-INCHES FINE GRAINED MATERIAL

EXISTING GROUND

ALLOW 1-FOOT FOR

PUMPING OF SURFACE

WATER RUNOFF

105 x 200-FOOT GOVERNMENT

PROVIDED LLDP LINER ONSITE

FOR SPENT ORE STOCKPILING

0.5% SLOPE

3:1 SLOPE

3:1 SLOPE

EXISTING

GROUND

EXISTING

GROUND

10-INCH ACTIVE BEAL

R.O. PIPE

DRAIN ROCK

8-INCH ABANDONED PIPE CORRIDOR HORIZONTAL DRAIN

EXISTING 10-INCH DIA PROCESS PIPE

PIPE CORRIDOR VERTICAL DRAIN DETAIL

T

LOWERED CENTER

SPILLWAY

NOTES:

1. A CHECK DAM IS A SMALL DEVICE CONSTRUCTED OF GRAVEL, SANDBAGS, OR FIBER ROLLS, PLACED ACROSS A NATURAL OR

MAN-MADE CHANNEL OR DRAINAGE DITCH. CHECK DAMS REDUCE SCOUR AND CHANNEL EROSION BY REDUCING FLOW

VELOCITIES AND ENCOURAGING SEDIMENT DROPOUT.

2. PLACE CHECK DAMS AT A DISTANCE THAT WILL ALLOW SMALL POOLS TO BE FORMED BEHIND EACH DAM.

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ROCK CHECK DAM DETAIL

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

SPENT ORE CONTAINMENT PAD,

PIPE CORRIDOR VERTICAL DRAIN,

AND ROCK CHECK DAM DETAILS

303 Irene Street

Helena, Montana 59601

8.0 FT

16.0 FT

8.0 FT

16.0 FT

16.0 FT

DIRECTION OF STRETCH

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LINE BRACE

CORNER BRACE

12 to 16 FT

GATE BRACE

CONSTRUCTION

A. ALIGNMENT: The fence will be built in straight line segments from brace to brace. All turns will require a corner brace which will be installed with the angle of the brace in line with the fence direction.

B. CLEARING: All brush will be cleared to the width necessary to construct the fences. All wires will be free of brush and limbs.

C. LINE POSTS: Spacing for the line posts will ve 16ft. between posts. Steel posts shall be driven until the anchor plate is at least 4" into the ground.

D. Braces:

1. LINE BRACES: Line braces will be placed a minimum of every mile of stretch. Corner or grate braces will as line braces if placed within mile of the last line brace. Line braces will consist of two brace posts and one horizontal post. The brace posts will be set a minimum of 36" in the ground and tamped in layers around the post untiil firm, No. 9 wire brace will be double wire twisted tight. The twist stick shall be secured in place.

2. GATE BRACES: Construct gate braces as described above and shown on the drawing, where indicated on the plans. Gates will be a minimum of 12 ft. wide with two twisted wire stays at width. Gate sticks will have a diameter of 3"-4". No 9 smooth wire will be used for all bales on brace posts.

3. CORNER BRACES: Corner braces will be placed at all turns in fence, constructed as described above and shown on the drawings.

E. BARRICADE MARKERS: 2 each 3"x12" PVC pipes shall be wraped with red and white reflective tape, at 45 degree angle. Slide the PVC pipe over the wire.

MATERIALS

A. POSTS:

1. Steel Line Post: Standard T post with a steel anchor plate, 5

ft. minimum length.

2. Wooden Brace Post: Pressure treated post with minimuym 6" diameter top x 8 ft.

3. Horizontal or Bracing Post: Minimum 2" diameter black steel pipe with no splices.

B. WIRE

1. Barbed Wire: Galvanized 12.5 gage, strength 90,000 to 105,000 psi.

2. Smooth Wire: No. 9, galvanized (for brace wire and gate loops).

C. STAYS: Stays shall be twisted wire. Wire stays will be 30"-36" long.

D. Staples: Galvanized, 1

" long.

E. GATE CLOSERS: Closeres shall ve "Sure Shut" manufactured by B&B Fabrications Grass

Range, MT (406) 428-2355, or equivalent.

SPIKE (TYP.)

2" BLACK STEEL

PIPE (TYP.)

DOUBLE WIRE BRACING,

TWISTED (NO. 9)

STEEL LINE POST

SPIKE (TYP.)

SPIKE (TYP.)

STEEL LINE POST

STEEL LINE POST

5" TO 6" DIAMETER

DOUBLE WIRE BRACING,

TWISTED (NO. 9)

DOUBLE WIRE BRACING,

TWISTED (NO. 9)

DOUBLE WIRE BRACING,

TWISTED (NO. 9)

TWISTED WIRE STAYS

2" TO 3" x 12" PVC PIPE WRAPPED

WITH REFLECTIVE TAPE

INSTALL TYPE 2 OBJECT MARKERS

ON BOTH SIDES OF POST

3" TO 4" WOOD GATE STICKS

FENCE AND GATE DETAILS

NOT TO SCALE

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BEAL MOUNTAIN MINE

2017 BARREN POND AND LEACH PAD CORRIDOR CLOSURE

TYPICAL FENCE DETAILS

303 Irene Street

Helena, Montana 59601