Haven't used Arrest, but I've used something similar called Poast Plus. I've since started using Arrow, which seems to get a better kill on most grasses. Broad leaf weeds might give you more of a problem at that location, and with chicory in the mix, there's not many herbicide options. Also, if the clover and alfalfa in the 12 point blend isn't pre-inoculated, you might want to consider using it this time. With a new plot, inoculate is very beneficial and its fairly cheap insurance.
POAST PLUS GRASS HERBICIDE - 2.5 GAL (Same as ARREST


ARROW GRASS HERBICIDE - 1 GAL (Same as SELECT or TRIGGER)


Alfalfa/Clover Inoculation (INTX-Prevail)