Jeff B., Andres, Kate

Yesterday, we took counts with a handheld particle counter outside the HAM4 chamber before removing the soft cover, and again in chamber. The counts were low, especially compared to the counts taken in February (see aLOG 9974). The battery on the counter was very low, and it may not have been working properly. 

The vertical wafer in front of SR2 (T1400195) was replaced with a new one. This will give us an idea of the contamination generated by door activity only. The table and suspension are not locked down, so the horizontal wafer in the center was not replaced.