skip to Main Content

I-75 Rescue Shaft

Building a Secant Pile Ring Wall for the I-75 Rescue Shaft We recently completed another rescue shaft like we did to rescue Bertha in Seattle. The I-75 Modernization Project in Michigan required the use of a tunnel boring machine (TBM)…

Read more

Flagler Beach

SR A1A is the north-south Florida State Road that runs along the Atlantic Ocean, from Key West at the southern tip of Florida, to Fernandina Beach, just south of Georgia  It is the main road through most oceanfront towns. In…

Read more

Murray CSO Control Facility

King County’s Murray Combined Sewer Overflow (CSO) Control Project involved construction of a 1-million gallon underground storage tank across from Lowman Beach Park along Beach Drive Southwest in Seattle. The purpose of this 6,000 square foot tank is to prevent…

Read more

Bertha Rescue Shaft

Malcolm was awarded the support of excavation contract to drill the rescue shaft for Bertha, the world’s largest Tunnel Boring Machine (TBM). Bertha stopped all forward progress after just 1,000-ft of mining the new SR99 transportation tunnel below downtown Seattle,…

Read more

New Irvington Tunnel

The 3.5-mile long New Irvington Tunnel provides a seismically sound conveyance connecting the San Francisco Public Utility Commission’s water sources in the Sierra Nevada and Alameda County to the Bay Area’s water supply systems. The project required one 41-foot diameter,…

Read more

Mitchell Interchange

As part of the I-94 North-South Corridor reconstruction program, the Wisconsin Department of Transportation reconstructed the Mitchell Interchange in Milwaukee, Wisconsin. The core contract included construction of three cut and cover tunnels along two system interchange ramps. All three tunnel…

Read more

Mormon Island Auxiliary Dam

The Mormon Island Auxiliary Dam Key Block project enhanced seismic stability of an earth dam on the east side of Folsom Lake, California. The scheme involved staged excavation and lean concrete backfilling along the downstream dam toe. The planned excavation…

Read more

SR-99 Tunnel Project

The SR-99 Tunnel Project for the Washington Department of Transportation parallels the waterfront through the south Seattle area and was constructed utilizing the world’s largest tunnel boring machine (TBM). Malcolm teamed with the Seattle Tunnel Partners JV to construct and…

Read more

City Creek Block 75

City Creek is a 20-acre urban redevelopment with five underground levels located in downtown Salt Lake City. Excavation for Block 75, the central six-acre segment of this project, required shoring and underpinning in combination with dewatering to support five adjacent…

Read more
Back To Top