Sonoma County supervisors have put off until 27 October a vote on a contract to sell the Mecham Road landfill to Republic Services because they needed more time to review details of the proposal. Republic Services proposes opening a new section of the county landfill by installing a $70 million liner that prevents leakage of toxics into area groundwater. It wants a 20-year commitment of trash flow from cities and promises $2.7 million in annual royalties to the county.