ACI got way ahead of its 50 and 200 day moving average. I think this trades back to the mid/high teens and unless it finds support at the 200 day average will dip before resuming an upward trend. Of course even this assumes that the recovery story is intact. If the market dips significantly, Arch could touch low teens. Long term this is a good company, but the recent runup in August and into September was huge and retracement makes sense.
I am on the sidelines looking to reenter in the 17 range.