station      date        
48           2006-11-15  
D41A         2007-06-27  
D41A         2007-08-21  
D6           2007-08-21  
D41A         2007-10-17  
D6           2007-10-17  
Petaluma_R.  2008-05-31  
D6           2008-10-10  
nd           nd