Following a decision last Tuesday by the Contra Costa County Board of Supervisors to table a sales tax to, in part, help embattled Doctors Medical Center in San Pablo, DMC registered nurses today announced plans to hold a picket today to demand the county assume operation of DMC with existing revenues and retain it as a full service hospital. Anything less than a full service hospital would abandon residents of West Contra Costa County and expose hundreds of thousands of area residents to the threat of no emergency and hospital care in their community, RNs said.