what's the vineyard surface (2010) with grand cru being bienvenues-bâtard-montrachet
create table table_13981938_1 (vineyard_surface__2010_ varchar, grand_cru varchar, PRIMARY KEY (vineyard_surface__2010_))
select vineyard_surface__2010_ from table_13981938_1 where grand_cru = "bienvenues-bâtard-montrachet"