Attached are my notes from Tuesday and today surveying the HAM3 ISI Optical Table and the HEPI Piers.

The ISI Optical Table in HAM3, very similar to HAM2, is tilted down from SW to NE about 0.5mm

The HEPI Piers, like at HAM2, are essentially unchanged during this full corner station sans diagonal vent.  The changes are in the noise of my measurement resolutions and I see the NW change of -0.4mm as an error on rod zero or reading.

Bottom Line: The level of the Optical Table is tolerable to IO and there is no indication that the vent has appreciably changed the tilt of HEPI => ISI Stage0.

Addressing the ISIs' table level would require changing locker shims and table balance; or, refloating HEPI and relocking to untilt the table.  Both doable, but neither fast--at least a day.