Geosynthetics October/November 2024 - 29

The original specification for the primary
geosynthetic barrier system (geomembrane)
called for the use of a threeply
60 mil (1.5 mm) chlorosulfonated
polyethylene (CSPE) geomembrane.
During the time of construction, there
were challenges in the supply of CSPE
materials, and the lining was changed
to a flexible polypropylene material to
get both the lining and the cover materials
delivered on time. While fRPP as a
geomembrane material had encountered
performance problems in potable-water
applications as a floating cover, as a liner
it would not be exposed to UV light and
was determined to be acceptable. The
final liner material selected was a threeply
fabric-reinforced flexible polypropylene
geomembrane (fRPP) 60 mil (1.5
mm) thick. The fRPP materials for the
liner were prefabricated prior to installation
according to a detailed panel layout.
All seams were welded using a 3-inchwide
(7.6 cm) wedge welder that bonded
the materials edge to edge without leaving
a flap of material at the seams.
To reduce creases in the lining material,
the fabricator on this project used
a 36-foot-wide (11 m) winder to create
rolls of fabricated materials that did not
require any folds in the material. There
is some thought that creases in fRPP
materials can lead to stress concentrations
that can initiate failures. This is
especially problematic in thicker materials
such as a 60 mil (1.5 mm) material.
By fabricating without folds, this particular
fabricator was eliminating this
area of potential problems.
The liner was anchored to the perimeter
of the containment using a concrete
stub wall and steel battens. This concrete
wall went around the entire perimeter.
Once the lining system was in place, the
entire area was surveyed using an electrical
leak location method. Weather problems
prevented the reservoir from being
installed in a straight-forward fashion and
FIGURE 3 Earth bench located half way down the slope provided
an important work and staging area for the installation crew
Figure 4 View looking down steep slope of floating cover under
construction including steps and vents
GeosyntheticsMagazine.com
29
http://www.GeosyntheticsMagazine.com

Geosynthetics October/November 2024

Table of Contents for the Digital Edition of Geosynthetics October/November 2024

Geosynthetics October/November 2024 - Cover1
Geosynthetics October/November 2024 - Cover2
Geosynthetics October/November 2024 - 1
Geosynthetics October/November 2024 - 2
Geosynthetics October/November 2024 - 3
Geosynthetics October/November 2024 - 4
Geosynthetics October/November 2024 - 5
Geosynthetics October/November 2024 - 6
Geosynthetics October/November 2024 - 7
Geosynthetics October/November 2024 - 8
Geosynthetics October/November 2024 - 9
Geosynthetics October/November 2024 - 10
Geosynthetics October/November 2024 - 11
Geosynthetics October/November 2024 - 12
Geosynthetics October/November 2024 - 13
Geosynthetics October/November 2024 - 14
Geosynthetics October/November 2024 - 15
Geosynthetics October/November 2024 - 16
Geosynthetics October/November 2024 - 17
Geosynthetics October/November 2024 - 18
Geosynthetics October/November 2024 - 19
Geosynthetics October/November 2024 - 20
Geosynthetics October/November 2024 - 21
Geosynthetics October/November 2024 - 22
Geosynthetics October/November 2024 - 23
Geosynthetics October/November 2024 - 24
Geosynthetics October/November 2024 - 25
Geosynthetics October/November 2024 - 26
Geosynthetics October/November 2024 - 27
Geosynthetics October/November 2024 - 28
Geosynthetics October/November 2024 - 29
Geosynthetics October/November 2024 - 30
Geosynthetics October/November 2024 - 31
Geosynthetics October/November 2024 - 32
Geosynthetics October/November 2024 - 33
Geosynthetics October/November 2024 - 34
Geosynthetics October/November 2024 - 35
Geosynthetics October/November 2024 - 36
Geosynthetics October/November 2024 - 37
Geosynthetics October/November 2024 - 38
Geosynthetics October/November 2024 - 39
Geosynthetics October/November 2024 - 40
Geosynthetics October/November 2024 - 41
Geosynthetics October/November 2024 - 42
Geosynthetics October/November 2024 - 43
Geosynthetics October/November 2024 - 44
Geosynthetics October/November 2024 - cover3
Geosynthetics October/November 2024 - cover4
Geosynthetics October/November 2024 - GeoFrontiers1
Geosynthetics October/November 2024 - GeoFrontiers2
Geosynthetics October/November 2024 - GeoFrontiers3
Geosynthetics October/November 2024 - GeoFrontiers4
Geosynthetics October/November 2024 - GeoFrontiers5
Geosynthetics October/November 2024 - GeoFrontiers6
Geosynthetics October/November 2024 - GeoFrontiers7
Geosynthetics October/November 2024 - GeoFrontiers8
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