The Seattle Mariners administration is bringing its janitorial services in-house, ending its contract with Aramark Sports and Entertainment, which has provided those services since Safeco Field opened in 1999.

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The Seattle Mariners administration is bringing its janitorial services in-house, ending its contract with Aramark Sports and Entertainment, which has provided those services since Safeco Field opened in 1999.

The move affects 78 employees beginning Dec. 31, according to a WARN notice from Washington state’s Employment Security Department.

Those employees have the chance to interview for open positions with the Mariners, said Joe Myhra, the Mariners’ vice president of ballpark operations.

Myhra declined to say exactly how many open positions there will be because “we’re not sure how it will play out” and that the organization is “looking for some efficiencies.”

But he said the number should be “relatively similar to what Aramark’s staffing level was,” with work beginning Jan. 4.

Myrha called Aramark a “wonderful organization” but said the Mariners decided to bring janitorial services in-house to provide even better service and to bring the employees “into the culture.”

An Aramark spokesman said in an email that “we’re proud of our partnership with the Mariners and the services we’ve provided to enhance the experience for fans and guests attending events at Safeco Field.