The alignment of the tracking stations in the muon arms will need
to be monitored on a regular basis so that the 25 
m survey
tolerances in the x-y plane can be met. This will be done with as
many as 112
straightness monitors which will be attached to the tracking
chambers. The position of a given straightness monitor should be
measured several times to reduce any error caused by air currents
or other random errors in the detection and readout chain. It is
expected that a set of alignment data for the entire system can
be collected in approximately 15 minutes. The
data can be taken at the same time as the physics data or it can
be taken with calibration data since it does not affect
the chamber performance. However, since the frequency of
alignment measurements required will depend on the stability of
the muon system which will not really be known until the detector
is fully assembled and taking data, we would like to have the option
of monitoring the alignment on a daily basis.