Malcolm’s first hydrocutter project in California was the Santa Ana Bridge in Corona. Slurry concrete diaphragm walls were installed for scour protection of the BNSF Railroad Bridge piers and abutments, just downstream of the Prado Dam.

The walls surrounding the existing piers are 3 feet thick and between 32 to 47 feet deep. The bridge piers are protected with pier nose extension cast-in-place walls up to 44 feet high and rest on a new steel pile foundation. For the bridge abutments, the walls are 4 feet thick and 34 to 92 feet deep. The deeper walls were constructed under the railroad bridge with just 25 feet of vertical clearance, which offered a low-headroom challenge that Malcolm was uniquely qualified to tackle with a new Bauer Hydrocutter machine.