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Mar. 27 48 Initial contract (Specification 17-08) awarded to Teichert Construction Mar. 31 52 30% Design, Advertised Spillways, Spillways, Oroville Emergency Recovery Contract (Specification 17-09) April 15 67 Spillways, Oroville Emergency Recovery Contract (Specification 17-09) awarded to Kiewit April 18- 20 70-72 USACE Risk Assessment Workshop April 22 74 First blasting excavation to stabilize over-steepened slopes May 2-4 84-86 COE Potential Failure Modes Analysis Workshop May 18 100 75% Design, Plans and Specifications May 19 101 Final Closure of FCO Gates on FCO for Spring 2017 June 21 134 Final Plans and Specifications issued for Review July 13 156 DSOD approval of Final Plans and Specifications July 13 156 First Secant Pile completed July 15 158 FERC approval of Final Plans and Specifications July 20 163 Revised Final Plans and Specifications issued Aug. 17- 18 191- 192 Final Clean-up/First Placement of RCC in Main Scour Hole Oct. 16 251 Lake Oroville 2017/2018 Flood Control Season Op. Plan completed Nov. 1 267 Final concrete placement on FCO Spillway chute Phase 1 Recovery 7. LESSONS LEARNED The expedited design and construction processes used in the urgent restoration of spillway capacity at Oroville Dam were unprecedented, and were only successful because of the commitment of everyone (owner, consultants, contractors, and regulators) to work together in partnership to ensure that the public was properly protected. Lessons learned during this project included housing all parties in one location, first in Sacramento and then at Oroville. The dedication of regulatory staff full-time to the project team and the timely comments and recommendations from the Board of Consultants were critically important in staying on schedule. The main contractor (Kiewit) maintained an extremely proactive and aggressive schedule throughout the construction period and quickly responded to scheduling issues whenever necessary to overcome the considerable construction challenges associated with the project. 83