Geosynthetics August/September 2020 - 22
CCR landfill final cover test pad-Part 1
Test pad description
upper bench, and separated by a 3H:1V
slope, was constructed at the landfill
site to establish appropriate specifications for the landfill final cover design
and construction.
The purpose of this article is to
describe the materials, procedures and
equipment used to construct the landfill
final cover system test pad and the evaluation of the completed test pad.
FIGURE 2 Final cover system
cross section. Note drainage
space between geotextile and
IDS geomembrane. (Not to scale,
figure courtesy of AGRU)
The test pad layers followed the requirements of the WVDEP permit and U.S.
Environmental Protection Agency (EPA)
rule for a landfill final cover, and included
the following (from the bottom up):
* Earthen subgrade
* 50-mil (1.27-mm) high-density
polyethylene (HDPE) integrated
drainage system geomembrane
* Minimum 8-ounce/square-yard
(271-g/m2) nonwoven IDS geotextile
* A 6-inch (15.2-cm) diameter perforated bench collection pipe
* Minimum 18-inch (45.7-cm) thickness of final cover soil over the IDS
geomembrane and geotextile
The IDS geomembrane is manufactured to provide a studded drainage surface on the top side and a spiked friction
surface on the bottom side. When covered
FIGURE 3 Test pad cross section, subareas C, E and A
Upper Bench
Top of Final Cover
Soil
18 in (46 cm) Lift Unprocessed Soil
(see Note 1)
8 oz/yd2 (271 g/m2) Nonwoven Geotextile
Subarea C
6 in (15 cm) Lift
Processed Soil
(See Note 2)
SUBAREA C
SUBAREA E E
Subarea
Top of CCR
6.1(6.1
m (20m)
ft)
20 ft
CCR
IDS Geomembrane
See Detail A
Min. 6 in (15 cm)Temporary Cover Soil
Prepared Subgrade
12 in (30.5 cm) Lift
Processed Soil
Cushion Geotextile
(Bench Only)
rea A
Suba
8 oz/yd2 (271 g/m2) Nonwoven Geotextile
(Installed in Contact with the IDS
Geomembrane)
IDS Geomembrane (Installed in Contact with
the Subgrade)
See Detail B
(20 m)
ft)
206.1
ft m
(6.1
CCR
Legend
Prepared Subgrade
Prepared Subgrade
Temporary Soil Cover
Added Protrusion (No. 57 Aggregate)
Added Protrusion
Top of
CCR
IDS Geomembrane
Nonwoven Geotextile
Hard Angular Rock, Approximate Maximum Dimension 4 in (10 cm)
Cushion Geotextile
Notes:
IDS Geomembrane (Installed in Contact
with the Cushion Geotextile)
1. Unprocessed soil had rocks and woody material
greater than 9 in (23 cm) in any dimension removed
prior to placement.
Cushion Geotextile (on Bench Only)
Prepared Subgrade
2. Processed soil is soil from the stockpile which had
application of the root rake to remove rocks and
woody material larger than 4 in (10 cm).
GAI FILE NUMBER:
22
Geosynthetics
| August September 2020
C130109-05-A2-002
8 oz/yd2 (271 g/m2) Nonwoven Geotextile
(Installed in Contact with the IDS
Geomembrane)
Top of CCR
FIGURE: 2
GAI DRAWING NUMBER:
002
DRAWN BY:
CLIENT
MAYHOEJ
TEST PAD CROSS SECTION
APPALACHIAN POWER CO.
SHEET NO.:
SCALE:
SUBAREAS C, E, AND A
JOHN E. AMOS LANDFILL
OF
N.T.S
PROJECT
Figure 2. Test
Pad Cross Section Subareas C, E, and A
0820GS_p20-27.indd 22
CHECKED BY: APPROVED BY:
ISSUE DATE:
© 2019 GAI Consultants 7/22/20
9:30 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
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Geosynthetics August/September 2020 - Cover3
Geosynthetics August/September 2020 - Cover4
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