If no deal is reached by midnight Sunday, the unions have promised to strike on Monday for the second time in three months, leaving 400,000 riders on the nation's fifth-largest rail system stranded.
"I would say it's a very good possibility. Again, we don't know what's going to happen," ATU president Antonette Bryant said Friday. "None of us want to strike. The bigger deal is that we want a deal and we think there's a deal to be made."
BART General Manager Grace Crunican also joined the discussions Friday after the unions repeatedly criticized her for not being more involved.
"The unions have been clear that they feel that Grace would be helpful in the process," BART spokesman Jim Allison said. "She's been abreast of all of the developments on a daily basis, hourly basis, sometimes."
Bryant said they want Crunican at the table "because she's the dealmaker. She's the one who can say yay, nay or whatever."