For the Victoria Island Conveyance Canal Pipeline near Discovery Bay, CA, Malcolm Drilling constructed access shafts for micro-tunneling a 96" diameter pipe under the Old River.

Using a Bauer BG 40 equipped with a CSM Attachment and BCM 10 cutting wheels, MDCI soil mixed overlapping CSM panels (3.3ft x 9.2ft) in a circular pattern to construct the access shafts.

The CSM panels provided shoring for the excavation of each shaft and also worked as a cut-off wall to prevent water from entering the shaft. Excavation continued in the dry despite being 60 ft below the water table.

Panels for the receiving shaft were mixed to a depth of 58ft and the shaft was excavated to a depth of 50ft. Panels for the jacking shaft were mixed to a depth of 103ft and the shaft was excavated to a depth of 95ft. system.