Sec. 6. (a) The county executive may allow a contract claim for work that was to be conducted under the supervision of the county surveyor, or an architect, engineer, superintendent, or inspector appointed by the executive, only if that supervisor certifies in writing on the claim that the work listed in the claim has been performed according to the contract and that the claim is due and owing under the contract. The supervisor's certificate must be filed with the claim.
(b) A county executive may not allow a claim on a contract covered by this section solely on the basis of the supervisor's certificate.