Gate valve 18 was closed at 11:45AM and then open again at 3:45PM

Hydrocarbons were still elevated at the y end and easy to measure without 
accumulation on a liquid nitrogen trap. Although water has come down as 1/t,
it seems that the hydrocarbons are not attenuating as quickly. The analysis
of the runs made over the last two days will be available within the next week 
and posted both in this log and in the DCC.