Cheryl,
We have looked after our contractors by adding to our safety system.
Contractors who have had their induction conducted are given a 'Green Card' and have free access to the site to conduct their activities unsupervised by a member of staff.
Those without a 'green card' are required to only conduct their workafter a permit has been written by the area manager. On the permit is an area where any hazards, be they safety or environment related, and controls for these hazards are recorded.
The contractor (including persons working with them) need to sign they will abide by these condidions.
At the completion of the job, the job is inspected by the area manger that it has been undertaken as per the permit. Then, and only then is the permit closed.
The aim is that regular contractors on site are trained and fully aware of their requirements. Those who have not been trained have the onus left upon the area manager.
Regards...