Our range was shown to be limited by the HVAC (Link). Since then Bubba and John have reduced air and water flow rates. Today I repeated the experiment to see how well we are doing. It looks like the HVAC is costing us about 3 Mpc now instead of about 5 before. I started some experiments to narrow down the dominant source but the microseism came up so high that I have stopped and will complete them later. Here are the ranges of time in which the HVAC was not in a steady state (the changes were made during science mode). 

Sitewide shutdown of turbines and chiller pumps.

Nov. 7 UTC

Turn off 19:15:00 19:23:34

Turn on 19:30:00  to 19:36:40

Turn off 19:45:00  to 19:48:40

Turn on 20:00:00 to 20:04:45

Turn off 20:15:00 to 20:18:40

Turn on 20:30:00  to 20:35:05

CS experiments

Nov. 8 UTC

SF 5 & 6 off 00:34:00 to 00:34:10 seis about normal, no change in range

SF 5 & 6 on 00:44:10 to 00:44:30

Turbines off but chiller pump on 1:10:00 to 1:10:10

All on 1:20:00 to 1:20:20

Chiller pump off 1:30:00 to 1:30:15

Chiller pump on 1:40:00 to 1:40:30