Okla. Stat. tit. 57, § 217

Upon approval by the Board of Corrections, the Director shall determine which prisoners shall be eligible for said public project, and shall establish and may modify lists of prisoners eligible for the said public projects. Upon the approval of said project by the Board of Corrections, the Director may send to the place and at the time designated the number of prisoners mutually agreed upon as necessary for the timely completion of said project.