2018-06-11_PERMIT FILE - M2008017 ‎(12)‎

• Permit No: M2008017
• IBM Index Class Name: Permit File
• Doc Date: 6/11/2018
• Doc Name Note: Map F‎(2)‎
• Doc Name: Adequacy Review Response
• From: J&T Consulting
• To: DRMS
• Type & Sequence: AM1
• Email Name: ECS
• Email Name: MAC
• Media Type: M
• Archive: No

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3'-5'
VARIES .ASTM C33-7
CONCRETE. -.-\
AGGREGATE
.....................
ASTM C33:
CONCRETE SAND
(IF REQUIRED)
1.5'
NP.
i. .
BACKFILL EXISTING
TRENCH WITH NATIVE
MATERIALS
4.0'
SAND AND GRAVEL
'ALLUVIUM
.05'
PERIMETER DRAIN DETAIL (TYPICAL SECTION IF REQUIRED,)
VARIES
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NATIVE
NMATERIAL
OVERBURDEN AND TOPSOIL
BACKFILL ALL DISTURBED AREAS
DOWN TO WATER SURFACE
IN /
WATER SURFACE ...
TYPICAL BACKFILL SECTION
N.T.S.
SLURRY WALL NOTES:
1. Bentonite Specifications
YP/PV ratio API Std. 13A less than 3
Viscometer greater than 30
Filtrate Loss less than 15 cm3
Moisture Content ASTM D 2216 less than 10 percent
Test results for each lot of (bentonite must be provided.
2. Water Specifications
pH 6-8
Hardness less than 200 ppm
Total Dissolved Solids less than 500ppm
Oil, organics, acids, alkali less than 50 ppm each
Chloride report
3. Bentonite Slurry General Specifications
The initial bentonite slurry must be tested prior to placement in
the trench. The slurry may be mixed in high shear mixers or
mixed and hydrated in slurry hydration ponds. In general, a
minimum hydration time of 8 hours will allow the bentonite slurry
to meet all criteria. A minimum bentonite content of 6 percent in
the slurry by weight is required.
4. Bentonite Slurry Testing Specifications before Placement
Viscosity Measured w/ Marsh Funnel (API RP 1313-1) less
than 40 sec
Density less than 64 pcf
Filtrate Loss less than 20 cm3
pH 6.5 to 10
The tests listed above should be run 1 or 2 times per shift and
at least once per batch of slurry. The slurry must be further
tested after placement in the trench. The tests conducted are for
viscosity, density, sand content, and pH. Two sets of tests per
shift at two locations in the trench (approximately 2 feet below
the slurry surface and 2 feet above the bottom of the trench)
are required. If the density of the slurry in the trench exceeds 85
pcf the excess solids must be removed by desanding or the slurry
replaced with fresh slurry. The slurry level must be maintained at
least 3 feet above the ground water elevation and no more than
2 feet below the top of the working platform.
5. Bentonite Slurry Testing Specifications after Placement
Unit Weight 1.03 to 1.40 gm,/cm3
Sand Content ASTM D 4381-184(1993)e 10 to 20 percent by
volume
6. Soil—Bentonite Backfill Specifications
S—B backfill slump ASTM C 143 1 set per 100 cu. yds.
Slump 2-6 inches
S—B backfill gradation 1 set per 300 cu. yds.
Screen (US Standard) Percent by Dry Weight
3 inch 100
# 4 40-80
#40 25-60
#200 20-40
Minimum Plasticity Index of 110
7. Ke.y Trench and Slurry Wall Cap Specifications
During excavation, soundings should be obtained to determine the
elevations of the top of the key layer, the bottom of the
excavation, and the bottom of the trench prior to backfilling. If
sediments in excess of 2 inches have accumulated it is necessary
to clean the trench bottom by airlift pumps or excavation
equipment to remove the sand and sediment that has settled. The
trench bottom should be cleaned, as a minimum, at the beginning
of each shift. Soundings sholuld be obtained approximately every
20 feet.
Adequate keying in the S—B backfill to an impermeable layer at
the base of the wall will be required and specified in the final
design report for the slurry wall. The design documents will include
a description of the key in layer and describe how trench cuttings
or other observations will be used to assure that the slurry wall
will be adequately keyed. Temporary slurry wall protection will be
required in the form of a nc>ncompacted soil cover placed within
one day over each backfilled 100 foot reach. The temporary cover
is removed after settlement 1(approximately 2 weeks) and replaced
with a compacted clay cover, over the completed slurry wall.
8. Post Construction Testing
Post construction testing will be conducted in accordance with the
"Colorado State Engineer's Office."
9. Above specifications (notes 1--8) are provided as a general
guideline for permitting purposes. Final specifications and design
criteria will be developed duriing the final design of the slurry wall.
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J&T Consulting, Inc.
Job #
07123
Date
2.13.18
Drawn By
WSS
Designed By
TPY
Checked By
JCY
File JT -Derr 2018 Rec
Scale
1" = 150'
Sheet;
Of:
3
3