The Arkansas Senate`s chief of staff is resigning after 15 years on the job. Bill Lancaster said yesterday he would leave the $93,000 a-year post to take another job. Lancaster did not give details about the new job, saying only that it would NOT be as a lobbyist or employee of another state agency. Before taking the Senate job, Lancaster spent seven years on staff for the House of Representatives. His resignation follows an investigation by four senators into the chamber`s operations following a Senate Efficiency Committee meeting this summer. Senate President Pro Tempore Jim Hill says he did not seek Lancaster`s resignation and that senators conducting the investigation did not recommend Lancaster resign.