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CANADYS STATION SLURRY WALL

Walterboro, South Carolina

The Canadys Station ash pond consists of a 95-acre basin surrounded by an 8,500-foot long, 20 to 25-foot-high dike. The pond was formed partially through excavation and partially through construction of earthen dikes. In an effort to cut off the flow of water from the ash pond to the Edisto River, a slurry wall utilizing a cement-bentonite mix design was developed by others. The 30-foot deep, low-permeability containment wall was constructed from the crest of the existing dike along its entire length.

Working for SCE&G, FME provided value engineering, contract specification review and interpretation, constructability review of the slurry mix design, compatibility testing review, and development of design modifications. During construction, FME performed construction management and provided daily quality assurance testing.

In addition, FME monitored and verified the suitability of the cement-bentonite slurry wall through instrumentation and monitoring of a test section during construction. FME utilized an automated excavation monitoring system to assure the slurry wall extended into low permeability stratum, which was 25 to 35 feet below the crest of dike.