For any county service area or zone thereof located therein, the Board of Supervisors may fix and collect charges for a particular extended service authorized pursuant to Title 3, Division 2, Chapter 2.2, Article 7 of the Government Code (commencing with Section 25210.70) to pay, in whole or in part, for the cost thereof. The revenue obtained thereby may be in lieu of, or supplemental to, revenue obtained by the levy of taxes. The charges may vary by reason of the nature of the use or the month in which the service is rendered to correspond to the cost and the value of the service. The charges may be determined by apportioning the total cost, not otherwise offset by other available revenue, of the extended service area to each parcel therein in proportion to the estimated benefits from such service to be received by each parcel. In the case of the El Macero County Service Area the amount of each charge shall be determined by apportioning the revenue to be obtained between occupied parcels and unoccupied parcels, excluding public rights of way, and then by dividing the revenue to be obtained from each respective class of parcels by the total number of parcels in that respective class; provided, however, that the charges for all services provided to parcels devoted to country club use shall be twenty (20) times that fixed for other parcels. (§ 1, Ord. 766, eff. October 5, 1976, as amended by § 2, Ord. 817, eff. October 3, 1978, § 1, Ord. 1107, eff. July 19, 1990, and § 2, Ord. 1209, eff. October 16, 1997)