Geosynthetics August/September 2020 - 26
CCR landfill final cover test pad-Part 1
Initial evaluation
The cover soil was exhumed from sloped
Subareas A and B where the subgrade
protrusions and large cover soil stones
had been placed. GAI observed that
the geotextile was not torn at any of the
exhumed locations.
After the cover soil was carefully
removed and the geotextile examined,
the geotextile was manually cut and
pulled back to expose the underlying
geomembrane. Visual observation of the
exposed IDS geomembrane indicated
subgrade protrusions, but the geomembrane had not been punctured at any of
the exhumed locations.
2016 conclusions and
regulatory approval
FIGURE 7 Unprocessed soil
placed over Subareas D and F and
compaction of 12-inch (30.5-cm) lift
of processed soil over Subarea A.
were placed in the same vicinity as the
subgrade protrusions, but slightly offset.
This would allow the effects of rocks both
above and below the geosynthetics to be
examined at the same exhumed location.
Placement of cover soil
Cover soil was placed in two lifts of
processed soil over Subareas A, C and
E and in one lift of unprocessed soil of
Subareas B, D and F (Figure 7). Each lift
of cover soil received four passes from a
crawler tractor (LGP dozer). This dozer
had a ground pressure of 4.8 psi (33.1
kPa). After compaction, GAI performed
nuclear moisture-density tests on the
cover soil.
26
Based on the test pad construction and
2016 evaluation, the following conclusions were made:
1. When 12 inches (30.5 cm) or 18 inches
(45.7 cm) of final cover soil (processed
or unprocessed) was placed and compacted on a 3H:1V slope with four
passes of an LGP dozer with ground
pressure less than 5 psi (34.5 kPa), subgrade protrusions of 1 inch (2.5 cm)
did not puncture the 50-mil (1.25-mm)
HDPE IDS geomembrane; therefore,
the test met the requirements for final
cover placement.
2. When unprocessed final cover soil containing particles up to 9 inches (22.9
cm) in dimension was spread on a
3H:1V slope and compacted to a minimum 85% Standard Proctor Maximum
Dry Density (SPMDD), the 8-ounce/
square-yard (271-g/m 2) nonwoven
IDS geotextile was not noticeably damaged and the 50-mil (1.25-mm) HDPE
IDS geomembrane was not punctured;
therefore, this test met the project
requirements for final cover placement.
Based on the test pad construction
observations, project specifications
Geosynthetics | August September 2020
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7/22/20 9:31 PM
Geosynthetics August/September 2020
Table of Contents for the Digital Edition of Geosynthetics August/September 2020
Geosynthetics August/September 2020 - Cover1
Geosynthetics August/September 2020 - Cover2
Geosynthetics August/September 2020 - 1
Geosynthetics August/September 2020 - 2
Geosynthetics August/September 2020 - 3
Geosynthetics August/September 2020 - 4
Geosynthetics August/September 2020 - 5
Geosynthetics August/September 2020 - 6
Geosynthetics August/September 2020 - 7
Geosynthetics August/September 2020 - 8
Geosynthetics August/September 2020 - 9
Geosynthetics August/September 2020 - 10
Geosynthetics August/September 2020 - 11
Geosynthetics August/September 2020 - 12
Geosynthetics August/September 2020 - 13
Geosynthetics August/September 2020 - 14
Geosynthetics August/September 2020 - 15
Geosynthetics August/September 2020 - 16
Geosynthetics August/September 2020 - 17
Geosynthetics August/September 2020 - 18
Geosynthetics August/September 2020 - 19
Geosynthetics August/September 2020 - 20
Geosynthetics August/September 2020 - 21
Geosynthetics August/September 2020 - 22
Geosynthetics August/September 2020 - 23
Geosynthetics August/September 2020 - 24
Geosynthetics August/September 2020 - 25
Geosynthetics August/September 2020 - 26
Geosynthetics August/September 2020 - 27
Geosynthetics August/September 2020 - 28
Geosynthetics August/September 2020 - 29
Geosynthetics August/September 2020 - 30
Geosynthetics August/September 2020 - 31
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Geosynthetics August/September 2020 - 34
Geosynthetics August/September 2020 - 35
Geosynthetics August/September 2020 - 36
Geosynthetics August/September 2020 - 37
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Geosynthetics August/September 2020 - 40
Geosynthetics August/September 2020 - 41
Geosynthetics August/September 2020 - 42
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Geosynthetics August/September 2020 - 45
Geosynthetics August/September 2020 - 46
Geosynthetics August/September 2020 - 47
Geosynthetics August/September 2020 - 48
Geosynthetics August/September 2020 - Cover3
Geosynthetics August/September 2020 - Cover4
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
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