Geosynthetics June/July 2023 - 17

completed with mechanical battens to the
interior and exterior of the precast ring
walls. A lightweight geotextile underlayment
provided additional ease of installation
for the geomembrane. The high
strength of the XR-5 ULT geomembrane
provided the puncture strength needed
with the gravel subgrade. XR-5 is a reinforced
ethylene copolymer geomembrane
and has been used worldwide by the U.S.
military for secondary fuel containment.
The diked area was sized for 8.8 million
gallons (33.3 million l) and was covered
with 265,000 square feet (25,000
m2) of the geomembrane. Daily and
annual temperature swings in the interior
of Alaska are some of the greatest
in the world, requiring a geomembrane
with extremely low thermal expansioncontraction
characteristics coefficient of
thermal expansion (CTE). The ethylene
copolymer compound composing the
XR-5 has an extremely low CTE, which
allows it to be left exposed in such a harsh
environment. That eliminates the need
for protective overburden, reducing cost
and maintenance, eliminating damaging
placement of aggregate, and allowing the
use of steeper slopes, which do not have
overburden stability concerns. It further
allows the operator to have continuous
monitoring of the condition of the geomembrane
rather than being buried with
an unknown condition.
The geomembrane was anchored at
the top of the 6 foot (1.8 m) high perimeter
dike in a standard earthen trench.
Depending on site conditions, this is
normally the preferred perimeter termination
method from a cost, schedule
and long-term flexibility standpoint.
Alternatively, when anchoring to perimeter
cast-in-place (CIP) concrete, embedment
strips made of the geomembrane
compound are often used.
While minimal vehicular traffic is
expected inside the lined containment
area and on the geomembrane, foot
GeosyntheticsMagazine.com
17
FIGURES 10-11 Prefabricated geomembrane liner and
installation in Berm. Photos courtesy of Integrity Environmental

http://www.GeosyntheticsMagazine.com

Geosynthetics June/July 2023

Table of Contents for the Digital Edition of Geosynthetics June/July 2023

Geosynthetics June/July 2023 - Cover1
Geosynthetics June/July 2023 - Cover2
Geosynthetics June/July 2023 - 1
Geosynthetics June/July 2023 - 2
Geosynthetics June/July 2023 - 3
Geosynthetics June/July 2023 - 4
Geosynthetics June/July 2023 - 5
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Geosynthetics June/July 2023 - 12
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Geosynthetics June/July 2023 - 44
Geosynthetics June/July 2023 - Cover3
Geosynthetics June/July 2023 - Cover4
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2024-january-2025
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-case-studies-guide-2024
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2024
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