def west_valley(parcels):
    """
    Dummy for presence in West Valley.

    """
    in_wv = parcels['mpa'].isin([
        'AV', 'BU', 'EL', 'GB', 'GL', 'GO', 'LP', 'PE', 'SU', 'TO', 'WI', 'YO'
    ])
    return (parcels['is_MC'] & in_wv).astype(int)