With four sets of municipal labor contracts set to expire in 13 days, the Nutter administration is fine-tuning a strike-contingency plan to minimize potential disruptions to trash pickup, health centers, library services and, possibly, the 311 call center.

"We're not doing strike planning because we are expecting a strike," Managing Director Camille Barnett said yesterday. "We're doing strike planning because we need to be ready."

Officials for both sides say they expect the deadline to come and go, and there's no way of telling when a strike might occur.

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