(a) Upon completion of the project, the district's engineer shall submit to the governing board a final detailed report including revised contract "as built" drawings showing the work as actually constructed, and the engineer shall certify to the executive director that the work was substantially completed in accordance with and includes all items in plans and specifications submitted to, or approved by the executive director.(b) Prior to accepting facilities for operation and maintenance, the district shall adopt rules as required by §293.112 of this title (relating to Water, Wastewater and Drainage Facilities).