Mayor James J. Fiorentini has appointed City Council vice president Robert H. Scatamacchia to the Hunking School Building Committee. Council president John A. Michitson had called on the mayor to appoint a council representative to the building committee, which is charged with exploring options for replacing the aging middle school. Extensive repairs to Hunking’s foundation were completed this summer to shore up the building, which had been in danger of collapse. The repairs are expected to last at least five years, enough time, city leaders hope, to devise a plan to construct a new school. School Committee member Joseph Bevilacqua is calling for a November vote on the project to determine whether the city’s voters will agree to temporarily raise their property taxes to fund Haverhill’s share of construction costs. The city’s share is expected to be at least $15 million. Overall, it is estimated the project will cost $55 million to $62 million, with the state picking up the remainder of the cost.