This is a continuation of yesterday's entry see https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=36371 

It appears that the scan taken on May 8th, just prior to the vent preparations, was taken before any large gate valves had been closed.  The scans that I took yesterday, May 24th, were just prior to opening the large gate valves.  In order to make a meaningful comparison, I will need to take a scan with the site configured as it was on May 8th, i.e. as it is now.  

1615 hours local -> I energized the Vertex RGA filament in preparation for taking a scan tomorrow.  I'll use the same RGA parameters as Chandra had used on May 8th and the data generated will provide a good comparison.