Geosynthetics August/September 2020 - 33

lowland to the influence of ocean tides
and creating a full tidal basin and managed tidal areas. However, bringing the
ocean tides back into the basin meant
the possibility of saltwater contamination of neighboring groundwater. To
prevent this, engineers specified that a
4,500-linear-foot (1,372-m) impermeable barrier wall be constructed to prevent saltwater migration. In September
2005, SG-325 PVC sheet piling was
installed to a depth of 30 feet (9 m) to
anchor the wall into a layer of impermeable clay. The wall installation was completed in just over one month using a
steel mandrel and a fixed mast pile driving rig with a vibratory hammer. The
full tidal basin was opened to the ocean

on Aug. 24, 2006. Since the restoration
of the wetlands, the seepage barrier has
performed as intended. Figures 4a and
4b shows the aerial and ground-level
wall alignment.

American Electric Power
Cardinal Plant fly ash pond
Cardinal Fly Ash Reservoir No. 2 (FAR2)
dam, located near Brilliant, Ohio, was
originally constructed as a zoned-earth
dam in 1985. In 1997, the dam was raised
to a height of 237 feet (72 m) using
roller-compacted concrete (RCC) in conjunction with a downstream earth fill.
In 2011 the dam was raised again. The
engineer specified a unique approach to

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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
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