Taum Sauk Reservoir AmerenUE Annapolis, MO Back to Project List High Mobility Grouting Drilling and grouting along the inner periphery of the RCC dam. Project Overview: The Taum Sauk Upper Reservoir is a pump storage generation facility owned and operated by AmerenUE. The original reservoir, built in 1963 as a concrete faced rock-fill dike, collapsed on December 14, 2005 releasing over 1.5 billion gallons of water down the mountain. The new reservoir being built will be the largest RCC Dam ever constructed in the United States. Layne is installing a 6,700 foot single-line (in some areas double) grout curtain with depths ranging from 60 ft to 95 ft around the inner periphery of the dam. The drilling and grouting operations are being performed in bedrock beneath the RCC dam. The underlying bedrock consists of fractured rhyolite with deep weathering features, intrusive granites and weathered diorite dikes. State of the art grouting software based on the Grout Intensity Number (GIN) method was specifically designed for this project and was used for monitoring and recording of grout volumes and pressures in real-time during each grouting operation.     Value of Work Performed: $3,100,000 Project Duration: 6 working months Project Completion Date: January 2010 Project Reference: Engineer: Paul C Rizzo Associates, Inc, Carl Rizzo, Vice President 314.206.0840 Owner: AmerenUE Craig Geismann, Managing Supervisor 314.342.1111