Query post types with multiple keys

meta_query has a relation parameter just like tax_query so:

$documents = array(
    'post_type' => 'documents',
    'meta_query' => array(
    'relation' => 'AND',
        array(
            'key' => 'document-type',
            'value' => 'manual',
        ),
       array(
            'key' => 'document-status',
            'value' => 'current',
        )
    )
);
query_posts( $documents );
get_template_part( 'loop', 'documents' );
wp_reset_query();