A. Before ordering an improvement authorized by this article, the board shall pass a resolution of intention to do so, briefly describing the improvement and its location. By the resolution and the subsequent proceedings, one or more improvements may be made and shall constitute one improvement and be constructed under one or more contracts. If the work proposed is already completed for a lot, the lot shall be excepted from the assessment to the extent of the work done, except as otherwise provided in this article.

B. If the proposed improvement, in the opinion of the board, is of more than local or ordinary public benefit, the board may order the expense of the improvement chargeable on a designated area within the sanitary district. The board shall describe the extent of the designated area in general terms in its resolution of intention by reference to street lines or block numbers or by designating its exterior boundaries by their courses and distances from the street or streets located where the improvement is proposed. The board may refer, for a more particular description, to a map on file with the sanitary district, showing the exterior boundary lines of the designated area and delineating block and lot numbers or containing such details as will show the location of the sewer lines and other facilities.

C. For purposes of ordering an improvement to be financed with monies borrowed from or financial assistance provided by the water infrastructure finance authority of Arizona with an assessment levied against a designated area within a sanitary district, the board may authorize the improvement only if requested by a petition signed by a majority of the property owners within the designated area to be assessed for the improvements.