[Takahashi, Sato, Horiuchi]

1. Revised the direction of geophone pre-amps.
2. Confirmed signals of the geophones on the DGS.
3. Adjusted the ballast rings on the IP. The geophone pods (35.4kg), TF ballast (52.7kg) and big block (1.8kg) were added. Three t=38 ballast rings (51.6kg), three t=19 ballast rings (25.8kg) and the ACCs (8.9kg) were removed. Total start weight was +3.6kg from setting in O3.
4. Tuned the IP. The resonant frequency reached less than 60mHz.