Elected officials, rather than an unelected ad hoc group, will take the lead in negotiating the renewal of a longstanding agreement that keeps a large swath of pesticides out of West Marin. Last week, the West Marin Mosquito Council asked the Bolinas Community Public Utility District to take the reigns as lead agency for renegotiating the agreement with the Marin/Sonoma Mosquito and Vector Control District. Observers say the move makes sense given that B.C.P.U.D. signed…