Arpin comes out of the bullpen and leads the NEWMAC with three saves.
WPI, which is currently in third place in the NEWMAC standings, closes the regular season with a home doubleheader against Fitchburg State Thursday.
WPI's first-round NEWMAC opponent is still to be determined.
Clark also is a member of the NEWMAC, but does not have a football team.
This announcement,'' WPI football coach Chris Robertson said, "signifies another great step in the growth of the NEWMAC and the WPI football program.
The NEWMAC is one of the premier athletic conferences in Division 3, and we are thrilled to now have our football program be part of its legacy.
The addition of football as a NEWMAC sport in 2017 is a tremendous development for our primary athletic conference and for WPI,'' WPI athletic director Dana Harmon said.
Junior Clare Doolin was named NEWMAC
Pitcher of the Year.
Puishys went 11-7 on the year, including a 3-1 ledger in overtime games, with six shutouts to help lead the Engineers to the NEWMAC Tournament for the first time since 2011.
The team's 3-5 record in league play earned them the sixth seed in the 2014 NEWMAC Field Hockey Championship.
Freshman Jenny Day, who won the 200 butterfly, 500 freestyle and 1,000 freestyle in WPI's meet with Coast Guard and Providence, was named NEWMAC
Co-Women's Swimmer of the Week.
Emerson College senior Ali Dokus of Littleton, who finished first at Rivier's Raider Invitational, was named NEWMAC
women's cross-country Runner of the Week.