But the transit agency countered that it needed to control costs to help pay for new rail cars and other improvements.
On Sunday, BART General Manager Grace Crunican presented a "last, best and final offer" that includes an annual 3 percent raise over four years and requires workers to contribute 4 percent toward their pension and 9.5 percent toward medical benefits.
The value of BART's proposal is $57 million, BART spokeswoman Alicia Trost said, adding that the agency is looking at ways to incorporate the unions' counterproposals into that cost.
SEIU Local 1021 executive director Pete Castelli said Monday the parties were between $6 million to $10 million apart.
Workers represented by the two unions, including more than 2,300 mechanics, custodians, station agents, train operators and clerical staff, now average about $71,000 in base salary and $11,000 in overtime annually, the transit agency said. BART workers currently pay $92 a month for health care and contribute nothing toward their pensions.
Meanwhile, Gov. Jerry Brown has stepped in to at least delay a strike by workers for regional bus system Alameda-Contra Costa Transit. Such a strike would leave commuters stranded without a mass transit alternative if a BART strike is underway at the same time.
Brown appointed a three-member panel to investigate a strike notice by union workers. The move effectively prevents a strike, which had been threatened for Thursday, for a week. Brown can then ask a court to order a 60-day cooling-off period in the contract dispute.
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