php - FastCGI for DocumentRoot only

I'm trying to set up HHVM for one of my websites. It is running on Apache 2.4, Ubuntu 14.04. I apologize for not being the most advanced system administrator, I am more in the software engineering end of the spectrum.

I've got HHVM installed when but when I use FastCGI for the entire Apache server, it breaks ownCloud. After a bit of reading, I find that the ownCloud developers are still in the process of getting it compatible with HHVM.

So I want to run just one directory with FastCGI and hence HHVM.

My website which I do want to run FastCGI for is in:

/var/www/website
A sub-directory in here is the document root as per:

DocumentRoot /var/www/website/www

(Some of the code lives above the document root for the website; classes, etc.)

ownCloud is in:
/var/www/owncloud

And has the configuration:

Alias /owncloud "/var/www/owncloud/"

    Options +FollowSymLinks
    AllowOverride All

I've tried quite a few things in apache2.conf without success.

ProxyPass / fcgi://127.0.0.1:9000/var/www
ProxyPass /owncloud/ //127.0.0.1:80/owncloud

­

ProxyPass /var/www/website/ fcgi://127.0.0.1:9000/var/www/website

­

ProxyPass /website/ fcgi://127.0.0.1:9000/var/www/website

­

    SetHandler fastcgi-script
    SetHandler proxy:fcgi://127.0.0.1:9000

Any ideas?