Based on the LHO dust monitor data, it takes up to 24 hours after a table incursion  
for dust levels to return to normal levels.  The L1 dust monitors were not active  
during S4 and we do not therefore have any indications of times of high dust at  
the L1 antisymmetric port other than the log of table incursions.  Since it appears  
at LHO at least that there are numerous epochs of high dust _not_ associated with  
a table incursion, the following (short) list of L1 table incursions is likely to cover  
only a subset of the epochs of high dust at L1.  The table incursion times are obtained  
from the site safety system which logs the times of card swipes.  (Rich Riesen, the   
site safety officer provided these times and I converted them to GPS.)  
  
L1 Table incursions:  
-------------------- 
%gps start  %gps end      %card name  
794027860   794027884     Brian O'Reilly  
794519128   794521027     Stephan Ballmer  
  
Proposed epoch veto times for L1  associated with dust from these incursions 
(start time = entry time, end time = exit time + 24 hrs):  
----------------------------------------------------------------------------- 
%gps start  %gps end  
794027860   794114284  
794519128   794607427