Ind. Code § 8-17-1-18

Sec. 18. Whenever any highway is completed, the inspector, surveyor, or engineer shall file a sworn statement with the county auditor stating that the highway has been completed according to plans, plats, profiles, specifications, and contract and that the quantity and quality of material used in making the improvement was as required under standards and tests of the department. A competent materials testing engineer shall determine in a report whether the tests and standards as to the quality of materials has been met. The materials testing engineer shall file a copy of the report with the county auditor.