Project Server 2007 - Get the PM who after some time does not approve the task

Hi Every one, 

I have some trouble to getting the person who after some time does not approve the task, that their team sended to approve for update % of work of the calendar, I need to put this result in a custom list, where in list all this PM's and which project and task is it, I don't have problems to pass the info to the list, but how can I get this information, please help, I tried to get this info via database but in a publish database this info is binary :S so I can't manipulate.

Thanks!