1998-08-05_REVISION - M1994117 ‎(2)‎

• Permit No: M1994117
• IBM Index Class Name: Revision
• Doc Date: 8/5/1998
• Doc Name: CASH MINE SITE DEVELOPMENT
• Type & Sequence: TR3
• Media Type: M
• Archive: No

50 MIL HOPE
LINER —
6' :E (NEW r� i
OR KLUDCATED)
UP -SLOPE ANCHOR EXISTING GROUND CREST ANCHORe
TRENCH e NEW 60-MIL HOPE LINER SURFACE NEW 60 -MIL HOPE TRENCH
- -- _ OVER GCL COMPOSITE LINER LINER OVER GCL EMBANKMENT RAISE
SIMILAR CREST EL. 8420 ENLISTING POWER
-_ -_ COMPOSITE LINER
-_____ EXISTING HOPE POLES (00 NOT
LINER DISTURB)
---- - - - - -- - TRENCH. SEE 7 4 (REMOVE g
DETAIL 4 BIAL REPLACE)
F <�..
GEOGRID
- -' - - "" S \\ 5' J1 2 TERRACE EXISTING
to N's __ EMBANKMENT AS
FOR TYPICAL LINER 6 .�.��� -� NECESSARY EXISTING
SECTION SEE DETAIL - " "'- -
- -- ...."."'-.....•- -,___, �, i GROUND
LEAVE EXISTING N "s _ - -_ rBU i�
EXCAVATION EXISTING
NATIVE SOIL AS '
1MTERIAL TAILINGS CONTAINMENT ESTIMATED - -- •`^-^ - - EMBANKMENT
BERM (APPROX. 5' HIGH) BEDROCK `'"""'^-- CREST EL. 8409 2
SURFACE \
TO
TAIUNGS POND EXPANSION
CONSTRUCTION DETAIL 1
awa C4
ANCHOR TRENCH r 6" ROAD WEARING SAFETY BERM I® M Imo•• w j
BACKFILL� 1 COURSE
371 SLOPE u! EXISTING GROUND
y - SURFACE
RANDOM FILL 2
1 '^ 1 - - - - - - -
(SEE NOTE 1)
1.5 1,5
NOTESi
1. RANDOM FILL CONSISTS OF BORROW MATERIAL GENERATED FROM POND
EXCAVATION. URGE ROCK FRAGMENTS AND BOULDERS THAT ARE GREATER
THAN 6' IN DIAMETER SHALL BE GRADED TO THE DOWNSTREAM FACE.
FINER GRAIN MATERIAL SHALL BE PLACED IN THE UPSTREAM ZONE OF THE
EMBANKMENT.
2. ALL FILL PLACED SHALL BE COMPACTED TO 90X OF MAX. DRY DENSITY,
AS DETERMINED BY ASTM D -1557.
NOTES
1. CAST EXCAVATED SPOIL TO OOWNSLOPE SIDE OF DITCH, SHAPE COMPACT
AND TRIM TO CONFIGURATION SHOWN.
2. SLOPE OF DITCH TO BE MAINTAINED AT NO GREATER THAN 24.
3. HAY BALES SWILL BE PLACED PERIODICALLY ALONG DITCH LENGTH AND AT
THE DITCH OUTLET FOR SEDIMENT CONTROL.
V —NOTCH DRAINAGE DITCH
C4
o a sacr
7��60 MIL HOPE LINER
_!& SAND LEVELING LAYER
/ �(AS NECESSARY)
%BEDROCK
TYPICAL UNER SECTION
NOT TO SCALE C4
EXISTING TAILINGS
TO REMAIN IN
PUCE
LUG 5 M8
DIV.
8
A90103C d
S1V83NIA 90 A10
CONSTRUCTION SEQUENCE
01 REMOVE THE EXPOSED LINER LOCATED ON THE NORTH BANK OF THE EXISTING
POND AND THE FENCE SURROUNDING THE POND.
® PLACE A BIAXIAL GEOGRID OVER THE EXISTING TAILINGS WHICH ARE TO BE
COVERED BY THE EMBANKMENT EXTENSION /RAISE. TERRACE THE DOWNSTREAM
SLOPE OF THE EXISTING EMBARKMENT AS NECESSARY TO PROVIDE SUITABLE
SURFACE FOR PLACEMENT AND COMPACTION OF MATERIAL.
Q EXCAVATE THE MATERIAL NORTH OF THE EXISTING POND TO THE CONTOUR
SHOWN ON DRAWING 5461 -C2. LEAVE AN INTERIM CONTAINMENT BERM BETWEEN
THE NEW EXCAVATION AND THE EXISTING TAILINGS POND. SECURE EDGE OF
EXISTING LINER IN INTERIM ANCHOR TRENCH.
Q PLACE AND COMPACT THE EXCAVATED MATERIAL TO FORM THE EMBANKMENT
EXTENSION. TERRACE THE DOWNSTREAM SLOPE OF THE EXISTING EMBANKMENT
AS NECESSARY TO PROPERLY PLACE AND COMPACT THE NEW EMBANKMENT
MATERIAL.
® INSTALL THE NEW 60 -MIL HOPE LINER AND GCL IN THE NEWLY EXCAVATED
PORTION OF THE POND FROM THE UP -SLOPE ANCHOR TRENCH TO THE
CONTAINMENT BERM. TEMPORARILY ANCHOR THE LINER AND GCL AT THE
CONTAINMENT BERM USING SAND BAGS.
® RELOCATE THE EXISTING TAILINGS WHICH ARE NOT LOCATED UNDERNEATH THE
EMBANKMENT EXTENSION INTO THE NEWLY LINED PORTION OF THE POND.
8 CONTINUE INSTALLING THE NEW LINER AND GCL FROM THE CONTAINMENT BERM.
ACROSS THE EXISTING POND, AND UP THE NEW EMBANKMENT EXTENSION TO THE
CREST ANCHOR TRENCH.
® PUCE FENCE AROUND POND PERIMETER AND EMBANKMENT CREST.
DIn
PRM
BY: LCO
I BY. —
I�ii11111NIpOgIIIN�I� „RIIII!IIIAI
0017750
POND DEWLS
TAIUNGS POND CREST
GEOMEMBRANE /GCL
ANCHOR TRENCH
%2,
rrt
C4
• o •
rm
WELD PHASE 2 OF NEW
SECURE GCL IN ANCHOR
LINER TO PHASE 1 OF NEW
TYP
TRENCH BEFORE INSTALLING
LINER ALONG UPSTREAM
PHASE 2 LINER
CREST OF INTERIM BERM
1'
INTERIM
NEW 60 MIL NOPE POND
- .
- CONTAINMENT
BERM
LINER. SEE NOTE 5O
• \\
\/
NEW 50 MIL NDP
LINER SEE NOTEU7
NEW GCL. -
/�
��
SEE NOTEQ�
%T
NEW GCL. SEE NOTEO7
EXISTING HOPE POND
COMPACTED \�
LINER
BACKF1U.
\
INTERIM ANCHOR TRENCH @4
NOT TO SCALE
C4
V —NOTCH DRAINAGE DITCH
C4
o a sacr
7��60 MIL HOPE LINER
_!& SAND LEVELING LAYER
/ �(AS NECESSARY)
%BEDROCK
TYPICAL UNER SECTION
NOT TO SCALE C4
EXISTING TAILINGS
TO REMAIN IN
PUCE
LUG 5 M8
DIV.
8
A90103C d
S1V83NIA 90 A10
CONSTRUCTION SEQUENCE
01 REMOVE THE EXPOSED LINER LOCATED ON THE NORTH BANK OF THE EXISTING
POND AND THE FENCE SURROUNDING THE POND.
® PLACE A BIAXIAL GEOGRID OVER THE EXISTING TAILINGS WHICH ARE TO BE
COVERED BY THE EMBANKMENT EXTENSION /RAISE. TERRACE THE DOWNSTREAM
SLOPE OF THE EXISTING EMBARKMENT AS NECESSARY TO PROVIDE SUITABLE
SURFACE FOR PLACEMENT AND COMPACTION OF MATERIAL.
Q EXCAVATE THE MATERIAL NORTH OF THE EXISTING POND TO THE CONTOUR
SHOWN ON DRAWING 5461 -C2. LEAVE AN INTERIM CONTAINMENT BERM BETWEEN
THE NEW EXCAVATION AND THE EXISTING TAILINGS POND. SECURE EDGE OF
EXISTING LINER IN INTERIM ANCHOR TRENCH.
Q PLACE AND COMPACT THE EXCAVATED MATERIAL TO FORM THE EMBANKMENT
EXTENSION. TERRACE THE DOWNSTREAM SLOPE OF THE EXISTING EMBANKMENT
AS NECESSARY TO PROPERLY PLACE AND COMPACT THE NEW EMBANKMENT
MATERIAL.
® INSTALL THE NEW 60 -MIL HOPE LINER AND GCL IN THE NEWLY EXCAVATED
PORTION OF THE POND FROM THE UP -SLOPE ANCHOR TRENCH TO THE
CONTAINMENT BERM. TEMPORARILY ANCHOR THE LINER AND GCL AT THE
CONTAINMENT BERM USING SAND BAGS.
® RELOCATE THE EXISTING TAILINGS WHICH ARE NOT LOCATED UNDERNEATH THE
EMBANKMENT EXTENSION INTO THE NEWLY LINED PORTION OF THE POND.
8 CONTINUE INSTALLING THE NEW LINER AND GCL FROM THE CONTAINMENT BERM.
ACROSS THE EXISTING POND, AND UP THE NEW EMBANKMENT EXTENSION TO THE
CREST ANCHOR TRENCH.
® PUCE FENCE AROUND POND PERIMETER AND EMBANKMENT CREST.
DIn
PRM
BY: LCO
I BY. —
I�ii11111NIpOgIIIN�I� „RIIII!IIIAI
0017750
POND DEWLS