Before the legislative body adopts an ordinance of intention to form the district, the superintendent of streets or other officer, board or commission of the local agency designated by the legislative body shall make and file with the clerk a preliminary report which shall contain the following information:

(ii) Each parcel of land benefited by the maintenance, giving each a separate number or designation upon the diagram. The said diagram, as approved by the legislative body, shall govern for all details as to the lands determined to be benefited by the maintenance and to thereafter be assessed.

The preliminary report, prior to its filing with the clerk, shall be referred to the planning commission, if any, for its recommendation upon the formation of such district. The recommendation of the planning commission shall be transmitted to the clerk along with the preliminary report.