Whenever the board is of the opinion that an improvement district should be formed, the board of directors shall adopt a resolution of intention which shall state: (a) the intention of the board to form the proposed improvement district, (b) the purpose for which the proposed improvement district is to be formed, (c) the estimated expense of carrying out said purpose, (d) if assessments are to be levied for carrying out such purpose, such assessments shall be levied exclusively upon the lands in said proposed improvement district, (e) if revenue bonds are to be used for carrying out such purpose, only the revenues derived from the operation of improvement district works shall be pledged to the payment of principal and interest on such bonds, and no tax or assessment shall ever be levied or collected to pay principal or interest on such bonds, (f) that a map showing the exterior boundaries of said proposed improvement district, which map shall govern for all details as to the extent of the proposed improvement district, is on file with the secretary of the district and is available for inspection by any person or persons interested, (g) the time and place for a hearing by the board on the formation of said proposed improvement district, the extent thereof, the purpose for which it is to be formed, the benefit to lands within the proposed improvement district from carrying out said purpose, the estimated expense of carrying out said purpose or any other matter relating to any of the foregoing, which hearing may be held concurrently with the hearing required by Chapter 2 (commencing with Section 35950) of this part, and (h) that at said time and place any persons interested, including all persons owning lands in the district or in the proposed improvement district, may appear and be heard.