CREATE TABLE table_13981938_1 (vineyard_surface__2010_ VARCHAR(255), grand_cru VARCHAR(255))
what's the vineyard surface (2010) with grand cru being bienvenues-bâtard-montrachet
    
SQL: SELECT vineyard_surface__2010_ FROM table_13981938_1 WHERE grand_cru = "Bienvenues-Bâtard-Montrachet"