For something that is supposed to last a long time, BC has changed the playing surface at Alumni quiet a bit over the last few years. The school and Astroturf just announced that Alumni will be getting a new rug. It is part of an extension with the synthetic grass company that will also include the baseball/softball fields and the Indoor Practice facility.
No costs were disclosed, but I assume BC got an significant break on the early upgrade to the Alumni surface due to selecting AstroTurf for all the new fields and facilities. BC made the switch to Astroturf from FieldTurf in 2012.