Okla. Stat. tit. 11, § 11-36-110: Contract for service of engineers for making

improvements.

A municipal governing body may contract for the services of

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

profiles, estimates and all other details for the work of

improvements and to supervise the work. The consulting engineer may

be a person, firm or corporation, resident in or outside the State

of Oklahoma, duly registered as an engineer in the State of

Oklahoma. The consulting engineer may be employed also to furnish

the necessary advertising, printing, appraising, transcripts and

other expense as may be necessary. The municipality shall provide

for the payment of such services and expenses from the assessments

to be levied against the abutting property as part of the cost of

the improvement.