This cache replaces GC89FK4. That location is under smelly water and along a road compromised after the recent heavy rains. It is a similar container in a much more accessible location.
Should the spiritual joys of a commute on 237 be just too overwhelming some day, take a detour and grab this one. This is a 24/7 cache but some stealth is required.
New Chicago Marsh lies just east of Alviso. The "Chicago" name comes from a bit of shady land development in the 1890's. Its legacy lives on in the street names in this section of the town. Do a web search for "New Chicago Marsh" for more information, and a few chuckles. Right now, the marsh is part of the San Francisco Bay National Wildlife Refuge. Their website contains more information and some trail maps.
VTA route 59 provides access to Alviso. It's a walk to this location but there are other caches along the way.
Congratulations to HabituallyTired and Kyriet11 for the FTF!