IMPLEMENTATION.

SEC. 205. IMPLEMENTATION. The authorities contained in this title shall take effect upon enactment and the Secretary is authorized to proceed with all preconstruction activities. For a period not to exceed 15 months thereafter, or such additional period as the Secretary and the Imperial Irrigation District, the Coachella Valley Water District, and the Metropolitan Water District of Southern California may agree, the Secretary shall provide to the Imperial Irrigation District the opportunity to become the sole Participating Contractor for the works on the All American Canal from Pilot Knob to Drop 4, and assume all non-Federal obligations to finance the works. After the expiration of the 15-month period or any extension thereto, the Secretary is authorized to enter into agreements with the California Contractors as provided in section 203(c) of this Act.