1. Chamber has just been flushed

2. CPC counts increased almost immediately after flushing was stopped

3. A few minutes later

4. Repeated a fill/flush cycle and left the bottom sheet almost flat (i.e. nearly atmospheric pressure)

5. Number concentration is so variable but there is certainly a leak! DMPS measured about 2 ugm-3 of mass for particles of about 100nm diameter

6. 15:23 end of fill/start of flush

7. 15:31 End of flush/ start of fill DMPS mass is decreasing (now 0.3 ugm-3), mode below 100 nm

8. 3 rd time!! DMPS measured 2.5 ugm-3 of ~ 250nm particles

9. OKKK.. One massive hole on a chamber wall.. And another big hole on another Wall…. Main lower and upper sheets to be replaced tomorrow…