(a) Electric service and telephone service shall be provided within each subdivision. Gas service may be required where reasonably accessible. Whenever such facilities are reasonably accessible and available, they may be required to be installed within the area prior to the approval of the final plat. Telephone, electric and street lighting wires, conduits and cables are encouraged to be constructed underground.
(b) Whenever a sanitary sewer line and electric and/or telephone lines are each placed underground in the same utility easement, the following provisions shall be applicable:
(1) The total easement width shall be not less than twenty feet;
(2) The sanitary sewer line shall be installed within three feet on one side of the easement, and the electric and/or telephone lines shall be installed within three feet of the opposite side of the easement.