2015-03-24_REVISION - M2008080 ‎(17)‎

• Permit No: M2008080
• IBM Index Class Name: Revision
• Doc Date: 3/24/2015
• Doc Name: Alternate Exhibit F TR01
• From: J&T Consulting, Inc
• To: DRMS
• Type & Sequence: TR1
• Email Name: PSH
• Email Name: TAK
• Media Type: M
• Archive: No

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PROPOSED PERMIT BOUNDARY an
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'LOCATION — PROPOSED SLURRY WALL
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l REQUIRED) TRENCH WITH NATIVE 4640 PROPOSED CONTOURS a
I MATERIALS PERIMETER DRAIN
. . . . . . . . . . . . . . .
. . . . . . . SANDY CLAY
1.5' TYP. OVERBURDEN
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VARIES ASTM' C33 7
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PERIMETER DRAIN DETAIL (TYPICAL SECTION IF REQUIRED)
INLET/OUTLET
n
N.T.S.
FACILITY
SLURRY WALL NOTES:
\ " 4
6. Soil—Bentonite Backfill Specifications
f , 1. Bentonite Specifications S—B backfill slump ASTM C 143 1 set per 100 cu. yds.
t YP/PV ratio API Std. 13A less than 3 0_
Viscometer greater than 30 Slump 2-6 inches a
Filtrate Loss less than 15 cm3 y
/. ` J\\ \"0 Moisture Content ASTM D 2216 Tess than 10 percent S—B backfill gradation 1 set per 300 cu. yds.
\ Test results for each lot of bentonite must be provided. Z
Screen (US Standard) Percent by Dry Weight O
--. 2. Water Specifications # 4ch 40080 a
PH 6-8
"°4 0 Hardness less than 200 ppm #40 25-60 W
1�1/C Total Dissolved Solids less than 500ppm #200 20-40
Oil, organics, acids, alkali less than 50 ppm each r
Chloride report Minimum Plasticity Index of 10 v
PERMIT ~
3. Bentonite Slurry General Specifications 7. Key Trench and Slurry Wall Cap Specifications r
BOUNDARY The initial bentonite slurry must be tested prior to placement in During excavation, soundings should be obtained to determine the 0° a
the trench. The slurry may be mixed in high shear mixers or elevations of the top of the key layer, the bottom of the n
mixed and hydrated in slurry hydration ponds. In general, a excavation, and the bottom of the trench prior to backfilling. If
EXISTING 25' minimum hydration time of 8 hours will allow the bentonite slurry sediments in excess of 2 inches have accumulated it is necessary o
GROUND OVERBURDEN AND TOPSOIL to meet all criteria. A minimum bentonite content of 6 percent in to clean the trench bottom by airlift pumps or excavation ri
BACKFILL ALL DISTURBED AREAS equipment to remove the sand and sediment that has settled. The o
3; S 33' DOWN TO WATER SURFACE 3' the slurry by weight is required. Z
�Opf 12.5' trench bottom should be cleaned, as a minimum, at the beginning
4594'ou 4, Bentonite Slurry Testing Specifications before Placement of each shift. Soundings should be obtained approximately every
_ Viscosity Marsh Funnel (API RP 13B— ) less 20 feet.
tha
o be d specified the final
4591' si ensured w AP 1
40
ec
Loss 0 cm3
Density less thans64 pcf Adeqthe uate keying in S B backfill o an impermeable layer at
to the k t
65 t 10 0
i
SLUR
RY WALL '
sign report for the slurry
The t listed assure e I
iste o h b n 1 or 2 times per shift and oedtherpobservationskwillibelaused to dssi9rbthatwhtreslurry wall
Filtrateless an
tion of the
ey
r and
nch
pH
e tests above should a run a �
SAND AND GRAVEL' /t'�iy , at least once per batch of slurry. The slurry must be further will be adequately keyed. Temporary slurry wall protection will be �J
��f�� / tested after placement in the trench. The tests conducted are for required in the form of a noncompacted soil cover placed within
viscosity, density, sand content, and pH. Two sets of tests per day over t reach. The temporary cover
one er each backfilled 100 foot
<0 shift at two locations in the trench (approximately 2 feet below is removed after settlement (approximately 2 weeks) and replaced
with a compacted c y cover over the completed slu ry wall. _
la r
5/08
8 --
����/\�j\ the slurry surface and 2 feet above the bottom of the trench) oohs 07113
P g Drawn By WSS
Posttesting w be conducted in accordance with the DesignedBv 9/1TPY
\ are regwre a density o e slurry in the trench exceeds 85 t Construction t Te
77
pcf the excess solids must be removed by desand ng or the slur uc i n s
fresh
level
t be
200 100 0 200 400 600 / / �/ �� /// // leastc3dfeethabove therground watry. The er elevatonsand noamoarieethanry ColoradosStateoEngineers Office. _ —
/ g 4' BEDROCK j ked By JCY
/ — // �� 2 feet below the top of the working platform. -- -
Chec
�j� /�.' , �,/ // �,' •/� j/' 9. Above specifications (notes 1-8) are provided as a general File JT-Reclamation alternate
SCALE IN FEET ' ` 5. Bentonite Slurry Testing Specifications after Placement guideline for permitting purposes. Final specifications and design scale 1" =2001
Unit Weight 1 .03 to 1.40 gnI criteria will be developed during the final design of the slurry wall.
B TYPICAL BACKFILL SECTION Sand Content ASTM D 43811-84(1993)e10 to 20 percent by Sheet: of:
N.T.S. volume 1