Alameda Corridor Project Contract C0104 Henry Ford Avenue Grade Separation Wilmington, California Back to Project List   Vibratory Ground Improvement Vibro Concrete Column installation work is performed adjacent to operating Union Pacific Rail Lines, and at working site grade below groundwater level. Project Overview: To alleviate conflicts between surface traffic and rail traffic in the busy Los Angeles metro area, Alameda Corridor Transportation Authority chose to elevate and depress rail traffic above and below surface traffic. The decision was made in an effort to improve the turn-around time of the intercontinental rail traffic from the Ports of Los Angeles and Long Beach. Layne GeoConstruction installed vibratory stone columns to reduce ground movements associated with seismic events, and to increase the cyclic shear resistance during earthquakes prior to construction of the MSE wall supporting the rail lines. The scope of the project involved a total of 2,480 vibro replacement stone columns and 170 dry vibro concrete columns.   Value of Work Performed: $2,800,000 Project Duration: 10 months (3 phases) Project Completion Date: May 2001 Project Reference: General Contractor: Shimmick Obalyashi Joint Venture Paul Camaur (510) 293-1100