Geoysynthetics August/September 2023 - 19

Conclusion
The relining and cover replacement of the
Lake Forest project incorporated many
of the current best practices outlined in
the American Water Works Association
(AWWA) Manual M25, Flexible-Membrane
Covers and Linings for PotableWater
Reservoirs. As the owner required
a 30-year service life for the liner and
cover, the material selection of the CSPE
material with its 50-year proven record in
potable water reservoir was an important
choice. The project also incorporated
an important weighted tensioned floating
cover design, including strategically
located custom troughs designed to manage
the water service levels and center
divider wall. Factory prefabrication of
the materials and appurtenances was
essential, ensuring high quality as well as
reduced installation risk and costs. With
the integration of a site-specific operation
and maintenance program including regular
planned inspections, all stakeholders
involved are confident that the new
Lake Forest reservoir liner and floating
cover system will perform very well and
achieve its expected 30-year service life.
This project is another good example of
engineered geosynthetic floating covers
being used to protect our environment.
References
American Water Works Association. (2000). Flexiblemembrane
covers and linings for potable-water
reservoirs, M25 manual of water supply practices, 3rd
ed., American Water Works Association, Denver, Colo.
GRI-GM19. (2002). Standard Specification for Seam
Strength and Related Properties of Thermally Bonded
Homogeneous Polyolefin Geomembranes/Barriers,
Revision 10, March 18, 2021. Geosynthetic Research
Institute, Folsom, Penn.
Mills, A. (2011). " The effects of chlorine on very low-density
thermoplastic olefins. " Geofrontiers 2011, Dallas, Texas, IFAI.
Stark, T. D., Hernandez, M. A., and Rohe, D. S. (2020).
" Geomembrane factory and field thermally welded
geomembrane seams comparison. " Geotextiles and
Geomembranes Journal, 48, no. 4 (August), 454-467,
https://doi.org/10.1016/j.geotexmem.2020.02.004. G
>> For more, search " floating covers "
at GeosyntheticsMagazine.com.
FIGURES 12-13 Surface cracks found in the RPP liner material folds and creases
GeosyntheticsMagazine.com
19

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Geoysynthetics August/September 2023

Table of Contents for the Digital Edition of Geoysynthetics August/September 2023

Geoysynthetics August/September 2023 - Cover1
Geoysynthetics August/September 2023 - Cover2
Geoysynthetics August/September 2023 - 1
Geoysynthetics August/September 2023 - 2
Geoysynthetics August/September 2023 - 3
Geoysynthetics August/September 2023 - 4
Geoysynthetics August/September 2023 - 5
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Geoysynthetics August/September 2023 - Cover3
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