I see: dishonourably discharged at Ft Grant, AT Aug 20, 01 I think it's a Z, not T - the ink on the bottom stroke has faded a bit. According to: https://en.wikipedia.org/wiki/Fort_Grant,_Arizona#History
the fort was in the Arizona Territory, abandoned by the army in 1905. Arizona gained statehood in 1912 and it became an industrial school for wayward boys and girls. Too much information, I know
comparing to the line soldier above him, also a dishonourable discharge, looks like it's SO #70, Dept. Colo, Aug 15, 01, Pt - private? Don't know what SO refers to but several soldiers have that written, but each with a unique number. Dept - deported, department - I have no idea. Agree with you that Colo is Colorado. Edited: Looking farther up the page - dept may be departed for (Colorado) as a Private.
Further up the page - discharged "by SO # " - could that mean standing order (ie the rule that each one broke?)