LPG under our bridges

The 25 or so tanker cars are still parked under and by the Carquinez and Al Zampa bridges.  At first I thought they were some of the crude petroleum cars seen around the Bay Area.  On closer inspection (and getting closer was scary easy) I could read the legends on the tanks.  They are Dot-112 cars carrying compressed liquefied petroleum gas.  The labeling also says “non-odorized”, so leaks would not be detectable by smell.  It is either butane or propane.  I don’t think that the labeling allows differentiation from the two.

Even if the tanks are empty, if they are marked flammable they probably still have some residual material inside that are dangerous.  Why are they parked HERE???  Is this a no brainer?

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