In addition to providing notice as otherwise required, before adopting an ordinance charging fees pursuant to Section 12240, the board of supervisors shall hold at least one public meeting, at which oral or written presentations can be made, as part of a regularly scheduled meeting. Notice of the time and place of the meeting, including a general explanation of the matter to be considered, and a statement that the information required by this section is available, shall be mailed at least 14 days prior to the meeting to any interested party who files a written request with the board of supervisors. Any written request for the mailed notices shall be valid for one year from the date on which it is filed unless a renewal request is filed. Renewal requests for the mailed notices shall be filed on or before April 1 of each year. The board of supervisors may establish a reasonable annual charge for sending the notices based on the estimated cost of providing that service. At least 10 days prior to the meeting, the board of supervisors shall make available to the public information indicating the amount of cost, or estimated cost, required to provide the service for which the fee is charged and the revenue sources anticipated to provide the service, including general fund revenues. If the fees create revenues in excess of actual cost, those revenues shall be used to reduce the fee creating the excess.