Except in instances involving legal issues or spam, Google’s policy for removing a page from our index requires that we obtain the permission of that page’s webmaster.
This prevents competitors from sabotaging each other’s listings. Please have the webmaster for the page in question contact us with proof that he/she is indeed the webmaster.
This proof must be in the form of a root level page on the site in question, requesting removal from Google. Once we receive the URL that corresponds with this root level page, we will remove the offending page from our index.
For more information on this process, please see http://www.google.com/remove.html
Excerpt taken from Google Webmaster Info