Section 357I.6 - Engineer1. When the board establishes a district, the board shall appoint a competent disinterested civil engineer, who shall prepare a preliminary plat showing: a. The proper design in general outline of the district.b. The lots and parcels of land within the proposed district as they appear on the county auditor's plat books with the names of the owners.c. The assessed valuation of the lots and parcels.2. The compensation of the engineer on the preliminary investigation shall be determined by the board. The engineer shall file a report with the county auditor within thirty days of appointment. The board may extend the time upon good cause shown.