If you're the owner or developer of a site it's your responsibility to investigate and address land contamination issues and ensure that any future development is safe and suitable for use.
If you think land may be contaminated
You'll need to appoint qualified, experienced and competent environmental consultants at the earliest opportunity who can investigate and address contamination issues on your behalf and advise on all legislative obligations.
You can find consultants in the Yellow Pages,
Ends Directory or by searching the internet.
You'll need to apply for planning permission to develop on the land, which will be subject to further review and conditions.