Due to high dust counts in BSC-9 on Tuesday 7-29, there was an early morning cleaning of the chamber this morning. The chamber was wipe as you go cleaned on the way into the chamber and again on the way out. Particle counts were taken before, during, and after the work. The stairs leading into the chamber were also wiped down. Description 0.3 0.5 1.0 In cleanroom cover on 79 27 3 In chamber cover on 26 17 6 In chamber cover 1/2 open 83 44 8 In chamber first cleaning 215 121 26 In chamber second cleaning 267 121 56 In chamber cover 1/2 open 505 245 60 In cleanroom cover on 19 8 1 In chamber cover on +5 min 201 98 27