• Ground freezing was used to stabilize running sand above and around a broken corrugated metal pipe (CMP) storm line. The broken pipeline was 7 feet in diameter and was buried 20 feet deep.

• Ground freezing was the selected means for repairs because it would prohibit settlement of the two sets of railroad tracks, located 10 feet from the pipe.

• A frozen soil "arch" was created over and next to the damaged section, allowing workers to safely repair the pipe from the inside.

• The cost savings realized by using ground freezing instead of shoring dewatering and underpinning for railroad tracks, exceeded $100,000.

Freeze pipe and heads after installation.
Note sink hole around pipes.