Geosynthetics October/November 2020 - 22

CCR landfill final cover test pad-Part 2

were placed on the subgrade, and 3 feet
(0.9 m) of unprocessed final cover soil
containing rocks up to 9 inches (22.9
cm) were placed over the IDS geotextile
and geomembrane and trafficked with
100 passes of a loaded 45-ton (40.8tonne) truck, the 8-ounce/square-yard
(271-g/m 2) nonwoven geotextile was
not noticeably damaged and the 50-mil
(1.27-mm) HDPE IDS geomembrane
was not punctured; therefore, this test
met project requirements for final cover
placement on trafficked benches. This
procedure was included in the project
specifications and approved by the West
Virginia Department of Environmental
Protection (WVDEP) as part of the
landfill closure permit.

2018 test pad evaluation
Although it was originally expected that
the test pad geomembrane would be
included in the final cap, it was later

FIGURE 4 Underside of exhumed geomembrane, Subarea B
22

decided that it would be more cost effective to remove the test pad rather than
to attempt seaming it to new surrounding geomembrane. This provided an
opportunity to exhume and view larger
areas of geosynthetics, and to view the
underside of the geomembrane nearly
two years after test pad construction.
Since carefully exhuming the soil and
geosynthetics was an added expense to
the project, the client asked that only
limited areas be carefully exhumed;
the remainder of the test pad would be
removed less carefully.
The carefully exhumed areas included
locations where rocks had been previously placed above and below the geosynthetics, and where the geotextile was
patched from the partial exhumation
in 2016. Survey equipment was used to
locate these areas.
Subarea B excavation
The soil cover for Subarea B was approximately 18-inches (45.7-cm) thick;
therefore, soil was excavated using an
excavator to a depth of 1.2 feet (36.6
cm), then hand shoveled to locate the
geotextile. Once the geotextile became
visible, the excavator carefully excavated
nearly all the way to the geotextile. The
cover soil had occasional large rocks
but was predominantly soil, and large
rocks were generally not in contact with
the geotextile. The soil just above the
geotextile was removed by hand with
shovels, and the geotextile was swept.
The 2018 Subarea B excavation was 7
feet (2.1 m) × 6.5 feet (2.0 m), which
was significantly larger than the 2016
geotextile patch.
The geotextile was examined, then
removed. Bumps on the upper surface of
the geomembrane clearly indicated where
stones had been placed on the subgrade
prior to geomembrane installation. No
signs of damage to the geotextile or IDS
geomembrane were identified.

Geosynthetics | October November 2020

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Geosynthetics October/November 2020

Table of Contents for the Digital Edition of Geosynthetics October/November 2020

Geosynthetics October/November 2020 - Cover1
Geosynthetics October/November 2020 - Cover2
Geosynthetics October/November 2020 - 1
Geosynthetics October/November 2020 - 2
Geosynthetics October/November 2020 - 3
Geosynthetics October/November 2020 - 4
Geosynthetics October/November 2020 - 5
Geosynthetics October/November 2020 - 6
Geosynthetics October/November 2020 - 7
Geosynthetics October/November 2020 - 8
Geosynthetics October/November 2020 - 9
Geosynthetics October/November 2020 - 10
Geosynthetics October/November 2020 - 11
Geosynthetics October/November 2020 - 12
Geosynthetics October/November 2020 - 13
Geosynthetics October/November 2020 - 14
Geosynthetics October/November 2020 - 15
Geosynthetics October/November 2020 - 16
Geosynthetics October/November 2020 - 17
Geosynthetics October/November 2020 - 18
Geosynthetics October/November 2020 - 19
Geosynthetics October/November 2020 - 20
Geosynthetics October/November 2020 - 21
Geosynthetics October/November 2020 - 22
Geosynthetics October/November 2020 - 23
Geosynthetics October/November 2020 - 24
Geosynthetics October/November 2020 - 25
Geosynthetics October/November 2020 - 26
Geosynthetics October/November 2020 - 27
Geosynthetics October/November 2020 - 28
Geosynthetics October/November 2020 - 29
Geosynthetics October/November 2020 - 30
Geosynthetics October/November 2020 - 31
Geosynthetics October/November 2020 - 32
Geosynthetics October/November 2020 - 33
Geosynthetics October/November 2020 - 34
Geosynthetics October/November 2020 - 35
Geosynthetics October/November 2020 - 36
Geosynthetics October/November 2020 - 37
Geosynthetics October/November 2020 - 38
Geosynthetics October/November 2020 - 39
Geosynthetics October/November 2020 - 40
Geosynthetics October/November 2020 - 41
Geosynthetics October/November 2020 - 42
Geosynthetics October/November 2020 - 43
Geosynthetics October/November 2020 - 44
Geosynthetics October/November 2020 - 45
Geosynthetics October/November 2020 - 46
Geosynthetics October/November 2020 - 47
Geosynthetics October/November 2020 - 48
Geosynthetics October/November 2020 - Cover3
Geosynthetics October/November 2020 - Cover4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 1
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 2
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 3
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 4
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 5
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 6
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 7
Geosynthetics October/November 2020 - Geosynthetics Conf. Brochure 8
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2021
https://www.nxtbook.com/ifai/geosynthetics/1220GS
https://www.nxtbook.com/ifai/geosynthetics/1020GS
https://www.nxtbook.com/ifai/geosynthetics/0820GS
https://www.nxtbook.com/ifai/geosynthetics/0620GS
https://www.nxtbook.com/ifai/geosynthetics/0420GS
https://www.nxtbook.com/ifai/geosynthetics/0220GS
https://www.nxtbook.com/ifai/geosynthetics/1219GS
https://www.nxtbook.com/ifai/geosynthetics/1019GS
https://www.nxtbook.com/ifai/geosynthetics/0819GS
https://www.nxtbook.com/ifai/geosynthetics/0619GS
https://www.nxtbook.com/ifai/geosynthetics/0419GS
https://www.nxtbook.com/ifai/geosynthetics/0219GS
https://www.nxtbook.com/ifai/geosynthetics/1218GS
https://www.nxtbook.com/ifai/geosynthetics/1018GS
https://www.nxtbook.com/ifai/geosynthetics/0818GS
https://www.nxtbook.com/ifai/geosynthetics/0618GS
https://www.nxtbook.com/ifai/geosynthetics/0418GS
https://www.nxtbook.com/ifai/geosynthetics/0218GS
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