227.639.  User fees. — The commission may impose user fees for the project.  The comprehensive agreement shall provide the rate of such user fees as may be established by agreement of the commission and the private partner.  Such user fees shall be set in an amount that takes into account any lease payments, reasonable costs of financing, development, and/or operation.  A rate schedule of the current user fees imposed and collected for use of the project shall be made available by the private partner or the commission to any member of the public upon request.  Such fees shall be the same for persons using the project under similar conditions, except as required by agreement between the commission and the private partner to preserve capacity and prevent congestion on the project.  The collection and enforcement of such user fees shall be consistent with sections 227.660 and 227.666.  The commission may authorize the private partner by the comprehensive agreement to collect and enforce user fees for the project.