Geosynthetics June/July 2023 - 26

Hugo, Colo., wastewater treatment system improvements
FIGURE 15 LGP-GPS equipment used for cover operation
again in November to repair damage
from the cover operation and grading
around the perimeter of the lagoons.
In total there were 94 post installation
repairs required, ranging from a 6-foot ×
6-foot (1.8-m × 1.8-m) patch to a scuff or
scratch, requiring only an extrusion bead
to reinforce. Post-install repair average
was 2.7 repairs per acre (0.4 h). Adding in
the necessary repairs made during installation,
the three lagoons were completed
with 147 total repairs or 4.2 repairs per
acre (0.4 h)-64% of which occurred after
the installation was complete and were
located visually without an electronic leak
location survey (ELLS).
FIGURE 16 Liner damage from equipment
FIGURE 17 Repair patch being installed over
damaged area
Future recommendations
An ELLS is a means of quality assurance
that is vastly underused but particularly
beneficial after an extensive cover operation
takes place or other work phases
occur after the installer has left. Though
not an issue on this project, other common
sources of damage include adjacent
construction activity, placing concrete
pads around or on top of a liner, setting
pipes, pressure washing, sludge removal,
final grading, nearby equipment or vehicle
traffic.
ELLS service companies could surFIGURE
18 Liner damage at anchor trench from perimeter grading
26
Geosynthetics | June July 2023
vey a 35-acre (14.16-h) site like the one
in Hugo for $20,000 to $30,000, depending
on the method and mobilizations.
Leak location surveys can be performed
before and/or after the cover material
has been placed. Machine-caused damage
is difficult to notice during construction,
and the ideal time to test is
after all activity has been completed on
the liner. Even without an ELLS, postinstallation
walk-throughs and checklists
on a scheduled basis are well worth
the investment, so owners and operators
can rest assured that their facility is
performing as expected at various stages
of its life cycle. Forms are available for

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
Geosynthetics June/July 2023 - 6
Geosynthetics June/July 2023 - 7
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Geosynthetics June/July 2023 - 12
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Geosynthetics June/July 2023 - 14
Geosynthetics June/July 2023 - 15
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Geosynthetics June/July 2023 - 18
Geosynthetics June/July 2023 - 19
Geosynthetics June/July 2023 - 20
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Geosynthetics June/July 2023 - 28
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Geosynthetics June/July 2023 - 41
Geosynthetics June/July 2023 - 42
Geosynthetics June/July 2023 - 43
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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