Looks like it's bracing the sides of the channel, like when they excavate city streets and don't want the sides to collapse in on them.
From:
Pete (admin)
(Wed 10 Dec 2003 02:55:14 AM EST)
Perhaps it's bracing the sides, but that sure is a lot more steel than seems necessary!
From:
PdR resident
(Mon 28 Nov 2005 05:38:24 PM EST)
This is part of a sewer line restoration project. A HUGE, brick-lined sewer line runs from the pictured location through the "Palisades del Rey" hill to Culver Boulevard. What you are lookng at is the recent (circa 2001) equipment which is either still being used or was abandoned by the GC.