Notwithstanding the provisions of section three hundred twelve of this chapter, in the case of unforeseen danger to life, safety, property or a necessary service, an emergency procurement may be made with the prior approval of the comptroller and corporation counsel, provided that such procurement shall be made with such competition as is practicable under the circumstances, consistent with the provisions of section three hundred seventeen of this chapter. A written determination of the basis for the emergency and the selection of the contractor shall be placed in the agency contract file, and shall further be submitted to the council no later than fifteen days following contract award, and the determination or summary of such determination shall be included in the notice of the award of contract published pursuant to section three hundred twenty-five of this chapter.