Okla. Stat. tit. 69, § 69-1306: Engineering

(a) The governing body of the city or the board of county

commissioners shall have authority to contract for the services of

consulting engineers to make the necessary surveys, plats, plans,

profiles, specifications, estimates, furnish construction stakes and

supervise construction at a cost not to exceed six percent (6%) of

the total cost of construction, exclusive of acquisition, and shall

provide for the payment of such engineering services as a part of

the cost of the limited access facility.

(b) The engineers may also be employed to supervise and

coordinate all nonconstruction work necessary to each project, such

as advertising, printing, typing, appraising, assistance in the

preparation of the appraisers' report, abstract work, all procedure,

clerical work, acquisition of right-of-way and all other work which

is necessary or essential to the completing of such limited access

facility.

(c) The city or county may cause the engineering and other work

provided for herein to be performed by the city or county engineer

and may cause the cost thereof to be included in the cost of that

part of the work financed by special assessments, on the same basis

as herein provided, for consulting engineers.

(d) The term "engineer" shall include the city engineer, county

engineer, or the consulting engineer, as the case may be.