According to E1100690-v8_WBSC8 Initial Alignment Procedure:

"The local BSC chamber coordinate system origin is nominally located 65.421 in [1661.7 mm] below the BSC-ISI optics table surface."
This would be the end of it except the chambers aren't necessarily exactly positioned on the global coordinate system.  The Global vertical zero is 0.1mm above the local gravity zero at BSC8-See T1100187 & T980044.  Our survey yesterday puts the Optical Table at 1662.6mm above the local level where BSC2 center is 0,0,0.  We subtract the 0.1mm from our survey result to put the elevation of the Optical Table into the global frame.  So the Optical Table is 1662.6 - 0.1 - 1661.7 = 0.8mm higher than nominal.  Not too bad since we set the support tubes 15 to 30mils high shooting the bottom side of the support tubes out side the chamber.  I was expecting some depression when the Cartridge landed but we didn't measure that as the dial indicators were no installed.

Any way, the level of the Optical Table is not to spec according to the requirement in E1100690 although I didn't think the requirement was as low as .1mrads; currently we have 0.53mrads.  However the elevation is within spec, if, if the ITM was not too far off in spec when it was measured at the test stand.  You know, the errors may combine to be fine or they may conspire to take the ITM out of position vertically.  I don't know that yet.  Regardless, the level will have to be tweaked anyway so we can fine tune the elevation as well.

If anyone doesn't understand my surveying notes or other gyrations, please feel free to ask.