Did a vacuum and wipe down cleaning in HAM3. The visual inspection with the flashlight array did not show large amounts of contamination inside the chamber. There were many large pieces of metal in the wells underneath the support tubes. After removing this debris, wiping did not show additional metal on the Alpha wipe. Particle counts were somewhat high during most of the cleaning, due to the disturbance of vacuuming and wiping. The counts spiked when Betsy & Travis entered BSC1, but they dropped back to “normal” background levels in a few minutes. What seemed to lower the particle counts significantly was having the top half of the soft cover open. One data point does not make a trend, but this is something to keep an eye on. Location 0.3 0.5 1.0 West side cleanroom cover on 14 4 2 In chamber Cover on 202 96 16 In chamber cover on +5 minutes 88 40 13 In chamber cover top half open 3 1 1 After vacuum cover on 339 182 36 East side cleanroom cover on 0 0 0 In chamber cover on 222 126 22 B&T in BSC1 cover on HAM3 668 435 101 In chamber cover on +5 minutes 286 161 29 In chamber cover top half open 17 13 9 After vacuum cover on 74 42 17 After wipe down cover on 421 216 47 West side cleanroom cover on 32 19 3 In chamber cover on 251 143 37 In chamber cover top half open 37 16 6 Betsy & Travis exit BSC1 during the west side wipe down After wipe down cover on 340 182 34 After wipe down cover on + 10 min 115 70 16