Alan (guest) View all posts in this topic  
Tue Jun 19, 2012 9:32 pm
Oil + smooth concrete.        

The tunnel surface is smooth concrete and has minimal drainage. So water and oil could collect at the tunnels lowest point.
Sigh... I knew to beware of oil but had no idea smooth concrete was a threat (not covered in MSF). Clearly the two combined--- very dangerous.

Lesson learned the hard way...

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