Problems with multi-site set up

I am currently attempting to set up a multi site installation on my machine so I can develop multiple sites from one Drupal code base. I have been following these tutorials:

http://drupal.org/node/32715
http://drupal.org/node/120647

and have followed the steps to create a default site and a site named GA. I have added host names drupal and GA to the /etc/hosts file and have a virual host section configured for each one accessed through .conf files in the vhosts.d dir under apache2 dir. I also have a localhost virtual server for other development. I have altered settings in sites/GA to point to a different database and tried changing the base_url but whenever I enter either http://drupal or http://GA I am given the same site. I have confirmed that I am using the same db by altering the sitename and the change appears on both. What am I doing wrong?

default vhost file:

Listen 80

NameVirtualHost *:80

<VirtualHost *:80>
	ServerName localhost

	Include /etc/apache2/vhosts.d/default_vhost.include

	<IfModule mpm_peruser_module>
		ServerEnvironment apache apache
	</IfModule>
</VirtualHost>

<VirtualHost *:80>
	ServerName drupal
	Include /etc/apache2/vhosts.d/drupal_vhost.include

	<IfModule mpm_peruser_module>
		ServerEnvironment apache apache
	</IfModule>
</VirtualHost>

<VirtualHost *:80>
	ServerName GA
	Include /etc/apache2/vhosts.d/GA_vhost.include

	<IfModule mpm_peruser_module>
		ServerEnvironment apache apache
	</IfModule>
</VirtualHost>

GA_vhost.include:

DocumentRoot "/var/www/drupal"

<Directory "/var/www/drupal">
	Options Indexes FollowSymLinks

	AllowOverride All

	Order allow,deny
	Allow from all
</Directory>

drupal_vhost.include is the same as the above.

default settings.php:

$db_url = 'mysql://user:pass@localhost/drupal_default';
 $base_url = 'http://drupal';

GA settings.php

$db_url = 'mysql://user:pass@localhost/GA';
 $base_url = 'http://GA';