On Monday 04/145/2014 We partly removed the soft covers on the North and South door of HAM5. Particle counts before the covers came off were generally zero, with an occasional 1 to 20 counts in the 0.3 and 0.5 micron range. I took several counts inside the chamber. Most were zero, which occasional spikes in the 100 0.3 micron range. I did see one spike with over 500 0.3 micron counts, and corresponding lesser counts in the larger particle sizes. These counts cleared within a few minutes and return to the normal ranges.