The Web application at http://webapp/site/sitecollcetion could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application.
Minimum Read Permission
Add to WSS_ADMIN_WPG group
Sharepoint Content DB (Site collection database) - db_owner permission
Sharepoint Config DB (Config DB of sharepoint installation) - - db_owner permission