TREVIICOS South selected Geotechnology Inc. to provide construction materials testing, cross-hole tomography, and environmental services for the Foundation Modification Project at Tuttle Creek Dam north of Manhattan.
TREVIICOS, of Tampa, Fla., is general contractor for the pre-construction phase of the Corps of Engineers’ $200 million project to stabilize sands beneath the 157-foot-tall, 7,500-foot-long rolled earth and rockfill embankment dam. Geotechnology, of St. Louis, is a geotechnical and environmental engineering firm.
The work, to be completed by 2012, will involve construction of a jet-grout cut-off wall and could include ground modifications. Without the improvements, the Corps said, a 5.7 to 6.6 magnitude earthquake could inflict significant damage to the structure. Thirteen thousand people live downstream.
In awarding a $50 million general contract to TREVIICOS in 2005, the Corps said work at Tuttle Creek represents the largest ground modification effort in the world involving an operational dam, and the largest dam safety modification project the agency has tackled.