I recently finished a contract with Future Path Development Group Inc., located in Ottawa. In Ottawa, this company has been busy creating an amazing Lotus Notes based system to solve environmental issues like yours. The system will let you track any and all waste products you choose. It generates detailed information for you (no calculator or special MSExcel/Access formula input required). It will also let you survey (through the internet) any employee on your specific waste issues, and give them instructions to correct their behaviour.
Check it out at http://www.futurepath.com/futurepath/FPPrograms.nsf/Solutions!OpenFrameSet
Look for the Environmental Section in the solutions area.